@article{2-s2.0-85163173309,

title = {Spatial consistency of cell growth direction during organ morphogenesis requires CELLULOSE SYNTHASE INTERACTIVE1},

author = { C. Mollier and J. Skrzydeł and D. Borowska-Wykręt and M. Majda and V. Bayle and V. Battu and J.C. Totozafy and M. Dulski and A. Fruleux and R. Wrzalik and G. Mouille and R.S. Smith and F. Monéger and D. Kwiatkowska and A. Boudaoud},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85163173309&doi=10.1016%2fj.celrep.2023.112689&partnerID=40&md5=ee793d110a083401054a5605aa7e1843},

doi = {10.1016/j.celrep.2023.112689},

issn = {22111247},

year  = {2023},

date = {2023-01-01},

journal = {Cell Reports},

volume = {42},

number = {7},

publisher = {Elsevier B.V.},

abstract = {Extracellular matrices contain fibril-like polymers often organized in parallel arrays. Although their role in morphogenesis has been long recognized, it remains unclear how the subcellular control of fibril synthesis translates into organ shape. We address this question using the Arabidopsis sepal as a model organ. In plants, cell growth is restrained by the cell wall (extracellular matrix). Cellulose microfibrils are the main load-bearing wall component, thought to channel growth perpendicularly to their main orientation. Given the key function of CELLULOSE SYNTHASE INTERACTIVE1 (CSI1) in guidance of cellulose synthesis, we investigate the role of CSI1 in sepal morphogenesis. We observe that sepals from csi1 mutants are shorter, although their newest cellulose microfibrils are more aligned compared to wild-type. Surprisingly, cell growth anisotropy is similar in csi1 and wild-type plants. We resolve this apparent paradox by showing that CSI1 is required for spatial consistency of growth direction across the sepal. © 2023 The Author(s)},

note = {2},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2-s2.0-85149153502,

title = {Plant biology: How the humble plant droops its leaves},

author = { D. Kwiatkowska},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85149153502&doi=10.1016%2fj.cub.2023.01.002&partnerID=40&md5=af7c678b14fb48ca1f80b4d424354f78},

doi = {10.1016/j.cub.2023.01.002},

issn = {09609822},

year  = {2023},

date = {2023-01-01},

journal = {Current Biology},

volume = {33},

number = {4},

pages = {R156-R158},

publisher = {Cell Press},

abstract = {The humble plant (Mimosa pudica) droops its leaves in response to touch. A new study explains how changes of turgor pressure exerted by protoplasts on surrounding cell walls translate into directional cell deformation that drives leaf movement. © 2023 Elsevier Inc.},

note = {2},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2-s2.0-85104318817,

title = {Structure, assembly and function of cuticle from mechanical perspective with special focus on perianth},

author = { J. Skrzydeł and D. Borowska-Wykręt and D. Kwiatkowska},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85104318817&doi=10.3390%2fijms22084160&partnerID=40&md5=452697aa93e59e615f05a841ec65a2cb},

doi = {10.3390/ijms22084160},

issn = {16616596},

year  = {2021},

date = {2021-01-01},

journal = {International Journal of Molecular Sciences},

volume = {22},

number = {8},

publisher = {MDPI AG},

abstract = {This review is devoted to the structure, assembly and function of cuticle. The topics are discussed from the mechanical perspective and whenever the data are available a special attention is paid to the cuticle of perianth organs, i.e., sepals, petals or tepals. The cuticle covering these organs is special in both its structure and function and some of these peculiarities are related to the cuticle mechanics. In particular, strengthening of the perianth surface is often provided by a folded cuticle that functionally resembles profiled plates, while on the surface of the petal epidermis of some plants, the cuticle is the only integral continuous layer. The perianth cuticle is distinguished also by those aspects of its mechanics and development that need further studies. In particular, more investigations are needed to explain the formation and maintenance of cuticle folding, which is typical for the perianth epidermis, and also to elucidate the mechanical properties and behavior of the perianth cuticle in situ. Gaps in our knowledge are partly due to technical problems caused by very small thicknesses of the perianth cuticle but modern tools may help to overcome these obstacles. © 2021 by the authors. Licensee MDPI, Basel, Switzerland.},

note = {3},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2-s2.0-85100578077,

title = {Xylan decomposition in plant cell walls as an inducer of surfactin synthesis by Bacillus subtilis},

author = { I. Szmigiel and D. Kwiatkowska and M. Łukaszewicz and A. Krasowska},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85100578077&doi=10.3390%2fbiom11020239&partnerID=40&md5=261568392bbb9be1881ca647671ef58f},

doi = {10.3390/biom11020239},

issn = {2218273X},

year  = {2021},

date = {2021-01-01},

journal = {Biomolecules},

volume = {11},

number = {2},

pages = {1-14},

publisher = {MDPI AG},

abstract = {Hemicellulose is the second most abundant plant heterogenous biopolymer. Among products obtained from a wide range of agro-residues, biosurfactants, e.g., surfactin (SU), are gaining increasing interest. Our previous studies have shown that a Bacillus subtilis strain can successfully produce a significant amount of SU using a rapeseed cake. This work aimed to investigate plant hemicellulose components as substrates promoting SU's efficient production by B. subtilis 87Y. Analyses of SU production, enzymatic activity and cell wall composition of hulled oat caryopses suggest that the main ingredients of plant hemicellulose, in particular xylan and its derivatives, may be responsible for an increased biosurfactant yield. © 2021 by the authors. Licensee MDPI, Basel, Switzerland.},

note = {1},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2-s2.0-85077615599,

title = {Deformation of a cell monolayer due to osmotic treatment: A case study of onion scale epidermis},

author = { S. Natonik-Białoń and D. Borowska-Wykręt and G. Mosca and M. Grelowski and R. Wrzalik and R.S. Smith and D. Kwiatkowska},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85077615599&doi=10.1139%2fcjb-2019-0027&partnerID=40&md5=a1843a05a469891e4ea23debf30b24c9},

doi = {10.1139/cjb-2019-0027},

issn = {19162804},

year  = {2020},

date = {2020-01-01},

journal = {Botany},

volume = {98},

number = {1},

pages = {21-36},

publisher = {Canadian Science Publishing},

abstract = {We performed a combination of experiments and mechanical simulations to assess the importance of cell geometry and wall structure in tissue and cell mechanics. Osmotic treatments combined with live imaging were used to quantify deformations at the tissue, cellular, and subcellular levels. We used the adaxial epidermis of onion scale as a model system. We found that the osmotically induced surface strain in onion is small because outer periclinal walls are thick and stiff, requiring bending stiffness to be considered in our mechanical models. As expected, the mechanical behaviors of the tissue and its component cells are related. Upon changes in internal pressure, cells embedded in the tissue undergo deformation that is different from isolated cells, while the tissue undergoes a somewhat counterintuitive deformation, e.g., shrinking upon pressurization, that depends on cell geometry. At the subcellular level, the amount of deformation and its anisotropy vary within the walls of individual cells, and are affected by the cell shape and vicinity of three-way wall junctions. When the turgor pressure is lost, the protoplast-facing wall surface wrinkles due to buckling, with the pattern of wrinkles depending on the strain anisotropy and the local wall geometry. © 2020, Canadian Science Publishing. All rights reserved.},

note = {5},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2-s2.0-85066835305,

title = {Erratum: Growing cell walls show a gradient of elastic strain across their layers (Journal of Experimental Botany Advance (2018) DOI: 10.1093/jxb/ery237)},

author = { M. Lipowczan and D. Borowska-Wykręt and S. Natonik-Białoń and D. Kwiatkowska},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85066835305&doi=10.1093%2fjxb%2fery280&partnerID=40&md5=cb20bdeb54380500da1f0b32475d2cfd},

doi = {10.1093/jxb/ery280},

issn = {00220957},

year  = {2018},

date = {2018-01-01},

journal = {Journal of Experimental Botany},

volume = {69},

number = {20},

pages = {4987-},

publisher = {Oxford University Press},

abstract = {Journal of Experimental Botany, Advance Access publication 26 June 2018, doi:10.1093/jxb/ery237 The original online version of this article contained errors in the typesetting of an equation, listed under 'Computation of minimum energy configurations of plates'. This equation, concerning the inward modulus (E) gradient described in part (ii), has now been corrected to read "(E1 > E2 > E3)". The publisher would like to apologise for this error. © 2018 Oxford University Press. All rights reserved.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2-s2.0-85055429118,

title = {Growing cell walls show a gradient of elastic strain across their layers},

author = { M. Lipowczan and D. Borowska-Wykręt and S. Natonik-Białoń and D. Kwiatkowska},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85055429118&doi=10.1093%2fjxb%2fery237&partnerID=40&md5=74f7e7ffc91b4a79053ee8c5db2d4437},

doi = {10.1093/jxb/ery237},

issn = {00220957},

year  = {2018},

date = {2018-01-01},

journal = {Journal of Experimental Botany},

volume = {69},

number = {18},

pages = {4349-4362},

publisher = {Oxford University Press},

abstract = {The relatively thick primary walls of epidermal and collenchyma cells often form waviness on the surface that faces the protoplast when they are released from the tensile in-plane stress that operates in situ. This waviness is a manifestation of buckling that results from the heterogeneity of the elastic strain across the wall. In this study, this heterogeneity was confirmed by the spontaneous bending of isolated wall fragments that were initially flat. We combined the empirical data on the formation of waviness in growing cell walls with computations of the buckled wall shapes. We chose cylindrical-shaped organs with a high degree of longitudinal tissue stress because in such organs the surface deformation that accompanies the removal of the stress is strongly anisotropic and leads to the formation of waviness in which wrinkles on the inner wall surface are always transverse to the organ axis. The computations showed that the strain heterogeneity results from individual or overlaid gradients of pre-stress and stiffness across the wall. The computed wall shapes depend on the assumed wall thickness and mechanical gradients. Thus, a quantitative analysis of the wall waviness that forms after stress removal can be used to assess the mechanical heterogeneity of the cell wall. © The Author(s) 2018. Published by Oxford University Press on behalf of the Society for Experimental Biology.},

note = {10},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2-s2.0-85041997672,

title = {Differential growth of pavement cells of Arabidopsis thaliana leaf epidermis as revealed by microbead labeling},

author = { J. Elsner and M. Lipowczan and D. Kwiatkowska},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85041997672&doi=10.1002%2fajb2.1021&partnerID=40&md5=a8c25e42eb1cfdb5b52acfb3b36e871c},

doi = {10.1002/ajb2.1021},

issn = {00029122},

year  = {2018},

date = {2018-01-01},

journal = {American Journal of Botany},

volume = {105},

number = {2},

pages = {257-265},

publisher = {Wiley-Blackwell},

abstract = {Premise of the Study: In numerous vascular plants, pavement cells of the leaf epidermis are shaped like a jigsaw-puzzle piece. Knowledge about the subcellular pattern of growth that accompanies morphogenesis of such a complex shape is crucial for studies of the role of the cytoskeleton, cell wall and phytohormones in plant cell development. Because the detailed growth pattern of the anticlinal and periclinal cell walls remains unknown, our aim was to measure pavement cell growth at a subcellular resolution. Methods: Using fluorescent microbeads applied to the surface of the adaxial leaf epidermis of Arabidopsis thaliana as landmarks for growth computation, we directly assessed the growth rates for the outer periclinal and anticlinal cell walls at a subcellular scale. Key Results: We observed complementary tendencies in the growth pattern of the outer periclinal and anticlinal cell walls. Central portions of periclinal walls were characterized by relatively slow growth, while growth of the other wall portions was heterogeneous. Local growth of the periclinal walls accompanying lobe development after initiation was relatively fast and anisotropic, with maximal extension usually in the direction along the lobe axis. This growth pattern of the periclinal walls was complemented by the extension of the anticlinal walls, which was faster on the lobe sides than at the tips. Conclusions: Growth of the anticlinal and outer periclinal walls of leaf pavement cells is heterogeneous. The growth of the lobes resembles cell elongation via diffuse growth rather than tip growth. © 2018 Botanical Society of America},

note = {20},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2-s2.0-85021145203,

title = {Gradient of structural traits drives hygroscopic movements of scarious bracts surrounding Helichrysum bracteatum capitulum},

author = { D. Borowska-Wykręt and A. Rypień and M. Dulski and M. Grelowski and R. Wrzalik and D. Kwiatkowska},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85021145203&doi=10.1093%2faob%2fmcx015&partnerID=40&md5=9a30620033957c30e3846802aa024e3d},

doi = {10.1093/aob/mcx015},

issn = {03057364},

year  = {2017},

date = {2017-01-01},

journal = {Annals of Botany},

volume = {119},

number = {8},

pages = {1365-1383},

publisher = {Oxford University Press},

abstract = {Background and Aims The capitulum of Helichrysum bracteatum is surrounded by scarious involucral bracts that perform hygroscopic movements leading to bract bending toward or away from the capitulum, depending on cell wall water status. The present investigation aimed at explaining the mechanism of these movements. Methods Surface strain and bract shape changes accompanying the movements were quantified using the replica method. Dissection experiments were used to assess the contribution of different tissues in bract deformation. Cell wall structure and composition were examined with the aid of light and electron microscopy as well as confocal Raman spectroscopy. Key Results At the bract hinge (organ actuator) longitudinal strains at opposite surfaces differ profoundly. This results in changes of hinge curvature that drive passive displacement of distal bract portions. The distal portions in turn undergo nearly uniform strain on both surfaces and also minute shape changes. The hinge is built of sclerenchyma-like abaxial tissue, parenchyma and adaxial epidermis with thickened outer walls. Cell wall composition is rather uniform but tissue fraction occupied by cell walls, cell wall thickness, compactness and cellulose microfibril orientation change gradually from abaxial to adaxial hinge surface. Dissection experiments show that the presence of part of the hinge tissues is enough for movements. Conclusions Differential strain at the hinge is due to adaxial-abaxial gradient in structural traits of hinge tissues and cell walls. Thus, the bract hinge of H. bracteatum is a structure comprising gradually changing tissues, from highly resisting to highly active, rather than a bi-layered structure with distinct active and resistance parts, often ascribed for hygroscopically moving organs. © The Author 2017. Published by Oxford University Press on behalf of the Annals of Botany Company. All rights reserved.},

note = {8},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2-s2.0-85017512737,

title = {In Memoriam: Zygmunt Hejnowicz (1929-2016)},

author = { D. Kwiatkowska and J. Nakielski and E.U. Kurczyńska},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85017512737&doi=10.1080%2f15592324.2017.1303593&partnerID=40&md5=e468d7d360154393bf0fbc1fd32dc84d},

doi = {10.1080/15592324.2017.1303593},

issn = {15592324},

year  = {2017},

date = {2017-01-01},

journal = {Plant signaling & behavior},

volume = {12},

number = {4},

pages = {e1303593-},

abstract = {Professor Zygmunt Hejnowicz passed away aged 87, on the first of May 2016. We describe his major research interests and contribution to plant development, anatomy, and biophysics, from the perspective of his close collaborators.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2-s2.0-84930640355,

title = {MorphoGraphX: A platform for quantifying morphogenesis in 4D},

author = { P.B. de Reuille and A.L. Routier-Kierzkowska and D. Kierzkowski and G.W. Bassel and T. Schüpbach and G. Tauriello and N. Bajpai and S. Strauss and A. Weber and A. Kiss and A. Burian and H. Hofhuis and A. Sapala and M. Lipowczan and M.B. Heimlicher and S. Robinson and E.M. Bayer and K. Basler and P. Koumoutsakos and A.H.K. Roeder and T. Aegerter-Wilmsen and N. Nakayama and M. Tsiantis and A. Hay and D. Kwiatkowska and I. Xenarios and C. Kuhlemeier and R.S. Smith},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-84930640355&doi=10.7554%2feLife.05864&partnerID=40&md5=2bc848f64b00656937202a22152fb707},

doi = {10.7554/eLife.05864},

issn = {2050084X},

year  = {2015},

date = {2015-01-01},

journal = {eLife},

volume = {4},

number = {MAY},

pages = {1-20},

publisher = {eLife Sciences Publications Ltd},

abstract = {Morphogenesis emerges from complex multiscale interactions between genetic and mechanical processes. To understand these processes, the evolution of cell shape, proliferation and gene expression must be quantified. This quantification is usually performed either in full 3D, which is computationally expensive and technically challenging, or on 2D planar projections, which introduces geometrical artifacts on highly curved organs. Here we present MorphoGraphX (www.MorphoGraphX.org), a software that bridges this gap by working directly with curved surface images extracted from 3D data. In addition to traditional 3D image analysis, we have developed algorithms to operate on curved surfaces, such as cell segmentation, lineage tracking and fluorescence signal quantification. The software’s modular design makes it easy to include existing libraries, or to implement new algorithms. Cell geometries extracted with MorphoGraphX can be exported and used as templates for simulation models, providing a powerful platform to investigate the interactions between shape, genes and growth. © Barbier de Reuille et al.},

note = {267},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2-s2.0-84927145226,

title = {The CUP-SHAPED COTYLEDON2 and 3 genes have a post-meristematic effect on Arabidopsis thaliana phyllotaxis},

author = { A. Burian and M. Raczyńska-Szajgin and D. Borowska-Wykręt and A. Piatek and M. Aida and D. Kwiatkowska},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-84927145226&doi=10.1093%2faob%2fmcv013&partnerID=40&md5=1c4e3943f718abdd6aed21ddfe1422a9},

doi = {10.1093/aob/mcv013},

issn = {03057364},

year  = {2015},

date = {2015-01-01},

journal = {Annals of Botany},

volume = {115},

number = {5},

pages = {807-820},

publisher = {Oxford University Press},

abstract = {Background and Aims: The arrangement of flowers in inflorescence shoots of Arabidopsis thaliana represents a regular spiral Fibonacci phyllotaxis. However, in the cuc2 cuc3 double mutant, flower pedicels are fused to the inflorescence stem, and phyllotaxis is aberrant in the mature shoot regions. This study examined the causes of this altered development, and in particular whether the mutant phenotype is a consequence of defects at the shoot apex, or whether post-meristematic events are involved. Methods: The distribution of flower pedicels and vascular traces was examined in cross-sections of mature shoots; sequential replicas were used to investigate the phyllotaxis and geometry of shoot apices, and growth of the young stem surface. The expression pattern of CUC3 was analysed by examining its promoter activity. Key Results: Phyllotaxis irregularity in the cuc2 cuc3 double mutant arises during the post-meristematic phase of shoot development. In particular, growth and cell divisions in nodes of the elongating stem are not restricted in the mutant, resulting in pedicel-stem fusion. On the other hand, phyllotaxis in the mutant shoot apex is nearly as regular as that of the wild type. Vascular phyllotaxis, generated almost simultaneously with the phyllotaxis at the apex, is also much more regular than pedicel phyllotaxis. The most apparent phenotype of the mutant apices is a higher number of contact parastichies. This phenotype is associated with increased meristem size, decreased angular width of primordia and a shorter plastochron. In addition, the appearance of a sharp and deep crease, a characteristic shape of the adaxial primordium boundary, is slightly delayed and reduced in the mutant shoot apices. Conclusions: The cuc2 cuc3 double mutant displays irregular phyllotaxis in the mature shoot but not in the shoot apex, thus showing a post-meristematic effect of the mutations on phyllotaxis. The main cause of this effect is the formation of pedicel-stem fusions, leading to an alteration of the axial positioning of flowers. Phyllotaxis based on the position of vascular flower traces suggests an additional mechanism of post-meristematic phyllotaxis alteration. Higher density of flower primordia may be involved in the post-meristematic effect on phyllotaxis, whereas delayed crease formation may be involved in the fusion phenotype. Promoter activity of CUC3 is consistent with its post-meristematic role in phyllotaxis. © The Author 2015. Published by Oxford University Press on behalf of the Annals of Botany Company. All rights reserved.},

note = {15},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2-s2.0-84934439158,

title = {Sequential replicas for in Vivo imaging of growing organ surfaces},

author = { D. Kwiatkowska and A. Burian},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-84934439158&doi=10.1007%2f978-1-62703-643-6_8&partnerID=40&md5=5e8a4b9e21d32d4b2da8cb034bc32651},

doi = {10.1007/978-1-62703-643-6_8},

issn = {10643745},

year  = {2014},

date = {2014-01-01},

journal = {Methods in Molecular Biology},

volume = {1080},

pages = {99-110},

publisher = {Humana Press Inc.},

abstract = {Sequential replica method facilitates in vivo imaging of plant surface and provides data sufficient for detailed computation of geometry and growth. It enables obtaining a series of high-resolution images visualizing details of the examined surface. Series of molds, made in dental polymer, representing the examined surface are used to obtain casts in epoxy resin, which are in turn observed by scanning electron microscopy, while the structure itself remains intact. Images obtained from casts can be further used for data extraction, comprising 3D reconstruction and computation of local geometry and cell growth parameters. The sequential replica method is a universal method and can be applied to image complex shapes of a range of structures, like meristems, flowers, stems, leaves, or various types of trichomes. Different plant species growing in various conditions can be studied. © 2014 Springer Science+Business Media, New York.},

note = {4},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2-s2.0-84893302816,

title = {FibrilTool, an ImageJ plug-in to quantify fibrillar structures in raw microscopy images},

author = { A. Boudaoud and A. Burian and D. Borowska-Wykręt and M. Uyttewaal and R. Wrzalik and D. Kwiatkowska and O. Hamant},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-84893302816&doi=10.1038%2fnprot.2014.024&partnerID=40&md5=31d61c13cf41d7b9c2edf3ac85598e3e},

doi = {10.1038/nprot.2014.024},

issn = {17542189},

year  = {2014},

date = {2014-01-01},

journal = {Nature Protocols},

volume = {9},

number = {2},

pages = {457-463},

publisher = {Nature Publishing Group},

abstract = {Cell biology heavily relies on the behavior of fibrillar structures, such as the cytoskeleton, yet the analysis of their behavior in tissues often remains qualitative. Image analysis tools have been developed to quantify this behavior, but they often involve an image pre-processing stage that may bias the output and/or they require specific software. Here we describe FibrilTool, an ImageJ plug-in based on the concept of nematic tensor, which can provide a quantitative description of the anisotropy of fiber arrays and their average orientation in cells, directly from raw images obtained by any form of microscopy. FibrilTool has been validated on microtubules, actin and cellulose microfibrils, but it may also help analyze other fibrillar structures, such as collagen, or the texture of various materials. The tool is ImageJ-based, and it is therefore freely accessible to the scientific community and does not require specific computational setup. The tool provides the average orientation and anisotropy of fiber arrays in a given region of interest (ROI) in a few seconds. © 2014 Nature America, Inc. All rights reserved.},

note = {318},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2-s2.0-84891507470,

title = {A correlative microscopy approach relates microtubule behaviour, local organ geometry, and cell growth at the Arabidopsis shoot apical meristem},

author = { A. Burian and M. Ludynia and M. Uyttewaal and J. Traas and A. Boudaoud and O. Hamant and D. Kwiatkowska},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-84891507470&doi=10.1093%2fjxb%2fert352&partnerID=40&md5=6c5bf7791016042f4e33afccbf0e69d1},

doi = {10.1093/jxb/ert352},

issn = {00220957},

year  = {2013},

date = {2013-01-01},

journal = {Journal of Experimental Botany},

volume = {64},

number = {18},

pages = {5753-5767},

abstract = {Cortical microtubules (CMTs) are often aligned in a particular direction in individual cells or even in groups of cells and play a central role in the definition of growth anisotropy. How the CMTs themselves are aligned is not well known, but two hypotheses have been proposed. According to the first hypothesis, CMTs align perpendicular to the maximal growth direction, and, according to the second, CMTs align parallel to the maximal stress direction. Since both hypotheses were formulated on the basis of mainly qualitative assessments, the link between CMT organization, organ geometry, and cell growth is revisited using a quantitative approach. For this purpose, CMT orientation, local curvature, and growth parameters for each cell were measured in the growing shoot apical meristem (SAM) of Arabidopsis thaliana. Using this approach, it has been shown that stable CMTs tend to be perpendicular to the direction of maximal growth in cells at the SAM periphery, but parallel in the cells at the boundary domain. When examining the local curvature of the SAM surface, no strict correlation between curvature and CMT arrangement was found, which implies that SAM geometry, and presumed geometry-derived stress distribution, is not sufficient to prescribe the CMT orientation. However, a better match between stress and CMTs was found when mechanical stress derived from differential growth was also considered. © The Author 2013. Published by Oxford University Press on behalf of the Society for Experimental Biology.},

note = {37},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2-s2.0-84881023371,

title = {Defects in leaf epidermis of Arabidopsis thaliana plants with CDKA;1 activity reduced in the shoot apical meristem},

author = { D. Borowska-Wykręt and J. Elsner and L. De Veylder and D. Kwiatkowska},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-84881023371&doi=10.1007%2fs00709-012-0472-9&partnerID=40&md5=a1c573c5e5706393384cf55385b3faa8},

doi = {10.1007/s00709-012-0472-9},

issn = {0033183X},

year  = {2013},

date = {2013-01-01},

journal = {Protoplasma},

volume = {250},

number = {4},

pages = {955-961},

abstract = {In Arabidopsis thaliana, like in other dicots, the shoot epidermis originates from protodermis, the outermost cell layer of shoot apical meristem. We examined leaf epidermis in transgenic A. thaliana plants in which CDKA;1.N146, a negative dominant allele of A-type cyclin-dependent kinase, was expressed from the SHOOTMERISTEMLESS promoter, i.e., in the shoot apical meristem. Using cleared whole mount preparations of expanding leaves and sequential in vivo replicas of expanding leaf surface, we show that dominant-negative CDKA;1 expression results in defects in epidermis continuity: loss of individual cells and occurrence of gaps between anticlinal walls of neighboring pavement cells. Another striking feature is ingrowth-like invaginations of anticlinal cell walls of pavement cells. Their formation is related to various processes: expansion of cells surrounding the sites of cell loss, defected cytokinesis, and presumably also, the actual ingrowth of an anticlinal cell wall. The mutant exhibits also increased variation in cell size and locally reduced waviness of anticlinal walls of pavement cells. These unusual features of leaf epidermis phenotype may shed a new light on our knowledge on morphogenesis of jigsaw puzzle-shaped pavement cells and on the CDKA;1 role in regulation of plant development via influence on cytoskeleton and plant cell wall. © 2012 The Author(s).},

note = {7},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2-s2.0-84859771647,

title = {Mechanical stress acts via Katanin to amplify differences in growth rate between adjacent cells in Arabidopsis},

author = { M. Uyttewaal and A. Burian and K. Alim and B. Landrein and D. Borowska-Wykrt and A. Dedieu and A. Peaucelle and M. Ludynia and J. Traas and A. Boudaoud and D. Kwiatkowska and O. Hamant},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-84859771647&doi=10.1016%2fj.cell.2012.02.048&partnerID=40&md5=24eb759f7d676173e05b18fa44f42459},

doi = {10.1016/j.cell.2012.02.048},

issn = {00928674},

year  = {2012},

date = {2012-01-01},

journal = {Cell},

volume = {149},

number = {2},

pages = {439-451},

publisher = {Elsevier B.V.},

abstract = {The presence of diffuse morphogen gradients in tissues supports a view in which growth is locally homogenous. Here we challenge this view: we used a high-resolution quantitative approach to reveal significant growth variability among neighboring cells in the shoot apical meristem, the plant stem cell niche. This variability was strongly decreased in a mutant impaired in the microtubule-severing protein katanin. Major shape defects in the mutant could be related to a local decrease in growth heterogeneity. We show that katanin is required for the cell's competence to respond to the mechanical forces generated by growth. This provides the basis for a model in which microtubule dynamics allow the cell to respond efficiently to mechanical forces. This in turn can amplify local growth-rate gradients, yielding more heterogeneous growth and supporting morphogenesis. © 2012 Elsevier Inc.},

note = {303},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2-s2.0-84859182833,

title = {Spatiotemporal variation of leaf epidermal cell growth: A quantitative analysis of Arabidopsis thaliana wild-type and triple cyclinD3 mutant plants},

author = { J. Elsner and M. Michalski and D. Kwiatkowska},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-84859182833&doi=10.1093%2faob%2fmcs005&partnerID=40&md5=ecf79842e00f33629b47dbdee5e583e9},

doi = {10.1093/aob/mcs005},

issn = {03057364},

year  = {2012},

date = {2012-01-01},

journal = {Annals of Botany},

volume = {109},

number = {5},

pages = {897-910},

abstract = {Background and Aims The epidermis of an expanding dicot leaf is a mosaic of cells differing in identity, size and differentiation stage. Here hypotheses are tested that in such a cell mosaic growth is heterogeneous and changes with time, and that this heterogeneity is not dependent on the cell cycle regulation per se. Methods Shape, size and growth of individual cells were followed with the aid of sequential replicas in expanding leaves of wild-type Arabidopsis thaliana and triple cyclinD3 mutant plants, and combined with ploidy estimation using epi-fluorescence microscopy. Key Results Relative growth rates in area of individual epidermal cells or small cell groups differ several fold from those of adjacent cells, and change in time. This spatial and temporal variation is not related to the size of either the cell or the nucleus. Shape changes and growth within an individual cell are also heterogeneous: anticlinal wall waviness appears at different times in different wall portions; portions of the cell periphery in contact with different neighbours grow with different rates. This variation is not related to cell growth anisotropy. The heterogeneity is typical for both the wild type and cycD3. Conclusions Growth of leaf epidermis exhibits spatiotemporal variability. © The Author 2012.},

note = {73},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2-s2.0-77957243623,

title = {Cyclin-dependent kinase activity maintains the shoot apical meristem cells in an undifferentiated state},

author = { T. Gaamouche and C.L.D.O. Manes and D. Kwiatkowska and B. Berckmans and R. Koumproglou and S. Maes and T. Beeckman and T. Vernoux and J.H. Doonan and J. Traas and D. Inzé and L. De Veylder},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-77957243623&doi=10.1111%2fj.1365-313X.2010.04317.x&partnerID=40&md5=109e932a14424942d353838cd708f3b4},

doi = {10.1111/j.1365-313X.2010.04317.x},

issn = {09607412},

year  = {2010},

date = {2010-01-01},

journal = {Plant Journal},

volume = {64},

number = {1},

pages = {26-37},

abstract = {As the shoot apex produces most of the cells that comprise the aerial part of the plant, perfect orchestration between cell division rates and fate specification is essential for normal organ formation and plant development. However, the inter-dependence of cell-cycle machinery and meristem-organizing genes is still poorly understood. To investigate this mechanism, we specifically inhibited the cell-cycle machinery in the shoot apex by expression of a dominant negative allele of the A-type cyclin-dependent kinase (CDK) CDKA;1 in meristematic cells. A decrease in the cell division rate within the SHOOT MERISTEMLESS domain of the shoot apex dramatically affected plant growth and development. Within the meristem, a subset of cells was driven into the differentiation pathway, as indicated by premature cell expansion and onset of endo-reduplication. Although the meristem structure and expression patterns of the meristem identity genes were maintained in most plants, the reduced CDK activity caused splitting of the meristem in some plants. This phenotype correlated with the level of expression of the dominant negative CDKA;1 allele. Therefore, we propose a threshold model in which the effect of the cell-cycle machinery on meristem organization is determined by the level of CDK activity. © 2010 Blackwell Publishing Ltd.},

note = {27},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2-s2.0-68949147036,

title = {Morphogenesis at the inflorescence shoot apex of Anagallis arvensis: Surface geometry and growth in comparison with the vegetative shoot},

author = { D. Kwiatkowska and A.L. Routier-Kierzkowska},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-68949147036&doi=10.1093%2fjxb%2ferp176&partnerID=40&md5=e10088b4a92afd781c65f74183cd9c46},

doi = {10.1093/jxb/erp176},

issn = {00220957},

year  = {2009},

date = {2009-01-01},

journal = {Journal of Experimental Botany},

volume = {60},

number = {12},

pages = {3407-3418},

abstract = {Quantitative analysis of geometry and surface growth based on the sequential replica method is used to compare morphogenesis at the shoot apex of Anagallis arvensis in the reproductive and vegetative phases of development. Formation of three types of lateral organs takes place at the Anagallis shoot apical meristem (SAM): vegetative leaf primordia are formed during the vegetative phase and leaf-like bracts and flower primordia during the reproductive phase. Although the shapes of all the three types of primordia are very similar during their early developmental stages, areal growth rates and anisotropy of apex surface growth accompanying formation of leaf or bract primordia are profoundly different from those during formation of flower primordia. This provides an example of different modes of de novo formation of a given shape. Moreover, growth accompanying the formation of the boundary between the SAM and flower primordium is entirely different from growth at the adaxial leaf or bract primordium boundary. In the latter, areal growth rates at the future boundary are the lowest of all the apex surface, while in the former they are relatively very high. The direction of maximal growth rate is latitudinal (along the future boundary) in the case of leaf or bract primordium but meridional (across the boundary) in the case of flower. The replica method does not enable direct analysis of growth in the direction perpendicular to the apex surface (anticlinal direction). Nevertheless, the reconstructed surfaces of consecutive replicas taken from an individual apex allow general directions of SAM surface bulging accompanying primordium formation to be recognized. Precise alignment of consecutive reconstructions shows that the direction of initial bulging during the leaf or bract formation is nearly parallel to the shoot axis (upward bulging), while in the case of flower it is perpendicular to the axis (lateral bulging). In future, such 3D reconstructions can be used to assess displacement velocity fields so that growth in the anticlinal direction can be assessed. In terms of self-perpetuation, the inflorescence SAM of Anagallis differs from the SAM in the vegetative phase in that the centrally located region of slow growth is less distinct in the inflorescence SAM. Moreover, the position of this slowly growing zone with respect to cells is not stable in the course of the meristem ontogeny.},

note = {11},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2-s2.0-67650914227,

title = {Influence of clavata3-2 mutation on early flower development in Arabidopsis thaliana: Quantitative analysis of changing geometry},

author = { T. Szczsny and A.L. Routier-Kierzkowska and D. Kwiatkowska},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-67650914227&doi=10.1093%2fjxb%2fern312&partnerID=40&md5=29f7652966b51ab4702ae55b335877c3},

doi = {10.1093/jxb/ern312},

issn = {00220957},

year  = {2009},

date = {2009-01-01},

journal = {Journal of Experimental Botany},

volume = {60},

number = {2},

pages = {679-695},

abstract = {Early development of the flower primordium has been studied in Arabidopsis thaliana clavata3-2 (clv3-2) plants with the aid of sequential in vivo replicas and longitudinal microtome sections. Sequential replicas show that, although there is no regular phyllotaxis in the clv3-2 inflorescence shoot apex, the sites of new primordium formation are, to a large extent, predictable. The primordium always appears in a wedge-like region of the meristem periphery flanked by two older primordia. In general, stages of primordium development in clv3-2 are similar to the wild type, but quantitative geometry analysis shows that the clv3-2 primordium shape is affected even before the CLAVATA/WUSCHEL regulatory network would start to operate in the wild-type primordium. The shape of the youngest primordium in the mutant is more variable than in the wild type. In particular, the shape of the adaxial primordium boundary varies and seems to be related to the shape of the space available for the given primordium formation, suggesting that physical constraints play a significant role in primordium shape determination. The role of physical constraints is also manifested in that the shape of the primordium in the later stages, as well as the number and position of sepals, are adjusted to the available space. Longitudinal sections of clv3-2 apices show that the shape of surface cells of the meristem and young primordium is different from the wild type. Moreover, there is only one tunica layer in both the meristem and in the primordium until it becomes a bulge that is distinctly separated from the meristem. Starting from this stage, the anticlinal divisions predominate in subprotodermal cells, suggesting that the distribution of periclinal and anticlinal cell divisions in the early development of the flower primordium is not directly affected by the clv3-2 mutation.},

note = {15},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2-s2.0-67651102570,

title = {A role for arabidopsis PUCHI in floral meristem identity and bract suppression},

author = { M.R. Karim and A. Hirota and D. Kwiatkowska and M. Tasaka and M. Aida},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-67651102570&doi=10.1105%2ftpc.109.067025&partnerID=40&md5=b40eaf1b956159e4c4ae7afe651d8ec9},

doi = {10.1105/tpc.109.067025},

issn = {10404651},

year  = {2009},

date = {2009-01-01},

journal = {Plant Cell},

volume = {21},

number = {5},

pages = {1360-1372},

publisher = {American Society of Plant Biologists},

abstract = {At the onset of flowering, the Arabidopsis thaliana primary inflorescence meristem starts to produce flower meristems on its flank. Determination of floral fate is associated with changes in the growth pattern and expression of meristem identity genes and suppression of a subtending leaf called a bract. Here, we show a role in floral fate determination and bract suppression for the PUCHI gene, an AP2/EREBP family gene that has previously been reported to play roles in lateral root morphogenesis. Mutations in PUCHI cause partial conversion of flowers to inflorescences, indicating that PUCHI is required for flower meristem identity. PUCHI is transiently expressed in the early flower meristem and accelerates meristem bulging while it prevents the growth of the bract primordium. The function of PUCHI in floral fate determination and bract suppression overlaps that of the BLADE-ON-PETIOLE1 (BOP1) and BOP2 genes, which encode a pair of redundant regulatory proteins involved in various developmental processes, including leaf morphogenesis and flower patterning. We also show that PUCHI acts together with BOP1 and BOP2 to promote expression of LEAFY and APETALA1, two central regulators of floral meristem identity. Expression patterns of the PUCHI and BOP genes point to a role in spatial control of flower-specific activation of these meristem identity genes. © 2009 American Society of Plant Biologists.},

note = {63},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2-s2.0-55949094905,

title = {New stereoscopic reconstruction protocol for scanning electron microscope images and its application to in vivo replicas of the shoot apical meristem},

author = { A.L. Routier-Kierzkowska and D. Kwiatkowska},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-55949094905&doi=10.1071%2fFP08047&partnerID=40&md5=d84ea5c1db73320df8e191d2838af014},

doi = {10.1071/FP08047},

issn = {14454408},

year  = {2008},

date = {2008-01-01},

journal = {Functional Plant Biology},

volume = {35},

number = {10},

pages = {1034-1046},

abstract = {The shoot apical meristem is a small and delicate organ, usually hidden between the young leaves and flowers that it produces. One approach to study meristem geometry and growth consists of taking consecutive replicas from the living meristem surface. In this paper, we present a new stereoscopic reconstruction method for this non-invasive replica protocol, which is applicable to study of growth and geometry of individual cells. This method had been used by the authors to study shoot apical meristem of two species: Arabidopsis thaliana (L.) Heynh. and Anagallis arvensis L., and can be extended to other species and organs. Scanning electron micrographs of the same replica are made at two different angles of view. The obtained stereopairs are used for the dense, three dimensional reconstruction of the replica surface. At the same time, some of the microscope parameters are refined based on the differences between the two micrographs. Three dimensional cell outlines are next extracted from the dense continuous reconstruction, and provide a basis for the quantification of meristem geometry and growth. The new reconstruction protocol can be used with different types of scanning electron microscopes, single- or multi-staged, does not require the identical working distance for the two micrographs of the stereopair, and can be used within a large range of magnifications, corresponding to the cases of either orthogonal or central projection model. It is based largely on recently published algorithms for stereoscopic vision. The reconstruction protocol can be used also for other stereoscopic applications based on scanning electron microscopy. The codes are written in Matlab and are freely available on request to the authors. © CSIRO 2008.},

note = {19},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2-s2.0-41649105134,

title = {Flowering and apical meristem growth dynamics},

author = { D. Kwiatkowska},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-41649105134&doi=10.1093%2fjxb%2ferm290&partnerID=40&md5=d9cda30b5452515e3c419845f5972fe6},

doi = {10.1093/jxb/erm290},

issn = {00220957},

year  = {2008},

date = {2008-01-01},

journal = {Journal of Experimental Botany},

volume = {59},

number = {2},

pages = {187-201},

abstract = {The shoot apical meristem generates stem, leaves, and lateral shoot meristems during the entire shoot ontogeny. Vegetative leaves are generated by the meristem in the vegetative developmental phase, while in the reproductive phase either bracts subtending lateral flower primordia (or paraclades), or perianth and strictly reproductive organs are formed. Meristem growth is fully characterized by the principal growth rates, directions, volumetric, and areal growth rates. Growth modelling or sequential in vivo methods of meristem observation complemented by growth quantification allow the above growth variables to be estimated. Indirectly, growth is assessed by cell division rates and other cell cycle parameters. Temporal and spatial changes of growth and geometry take place at the meristem during the transition from the vegetative to the reproductive phase. During the vegetative phase, meristem growth is generally indeterminate. In the reproductive phase it is almost always determinate, but the extent of determinacy depends on the inflorescence architecture. In the vegetative phase the central meristem zone is the slowest growing region. The transition from the vegetative to the reproductive phase is accompanied by an increase in mitotic activity in this zone. The more determinate is the meristem growth, the stronger is this mitotic activation. However, regardless of the extent of the activation, in angiosperms the tunica/corpus structure of the meristem is preserved and therefore the mitotic activity of germ line cells remains relatively low. In the case of the thoroughly studied model angiosperm plant Arabidopsis thaliana, it is important to recognize that the flower primordium develops in the axil of a rudimentary bract. Another important feature of growth of the inflorescence shoot apical meristem is the heterogeneity of the peripheral zone. Finally, the role of mechanical factors in growth and functioning of the meristem needs further investigation. © The Author [2008]. Published by Oxford University Press [on behalf of the Society for Experimental Biology]. All rights reserved.},

note = {81},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2-s2.0-31544460419,

title = {Flower primordium formation at the Arabidopsis shoot apex: Quantitative analysis of surface geometry and growth},

author = { D. Kwiatkowska},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-31544460419&doi=10.1093%2fjxb%2ferj042&partnerID=40&md5=aae2fd4b66982b3e6de6aa4d8ab9ecad},

doi = {10.1093/jxb/erj042},

issn = {00220957},

year  = {2006},

date = {2006-01-01},

journal = {Journal of Experimental Botany},

volume = {57},

number = {3},

pages = {571-580},

abstract = {Geometry changes, especially surface expansion, accompanying flower primordium formation are investigated at the reproductive shoot apex of Arabidopsis with the aid of a non-invasive replica method and a 3-D reconstruction algorithm. The observed changes are characteristic enough to differentiate the early development of flower primordium in Arabidopsis into distinct stages. Primordium formation starts from the fast and anisotropic growth at the periphery of the shoot apical meristem, with the maximum extension in the meridional direction. Surprisingly, the primordium first becomes a shallow crease, and it is only later that this shape changes into a bulge. The bulge is formed from the shallow crease due to slower and less anisotropic growth than at the onset of primordium formation. It is proposed that the shallow crease is the first axil, i.e. the axil of a putative rudimentary bract subtending the flower primordium proper, while the flower primordium proper is the bulge formed at the bottom of this axil. At the adaxial side of the bulge, the second axil (a narrow and deep crease) is formed setting the boundary between the flower primordium proper and the shoot apical meristem. Surface growth, leading to the formation of the second axil, is slow and anisotropic. This is similar to the previously described growth pattern at the boundary of the leaf primordium in Anagallis. © The Author [2005]. Published by Oxford University Press [on behalf of the Society for Experimental Biology]. All rights reserved.},

note = {66},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2-s2.0-33745479866,

title = {Dynamic and compensatory responses of Arabidopsis shoot and floral to meristems to CLV3 signaling},

author = { R. Müller and L. Borghi and D. Kwiatkowska and P. Laufs and R. Simon},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-33745479866&doi=10.1105%2ftpc.105.040444&partnerID=40&md5=d502d1dd00c2fb38f9340c578f10e6f4},

doi = {10.1105/tpc.105.040444},

issn = {10404651},

year  = {2006},

date = {2006-01-01},

journal = {Plant Cell},

volume = {18},

number = {5},

pages = {1188-1198},

publisher = {American Society of Plant Biologists},

abstract = {In Arabidopsis thaliana, the stem cell population of the shoot system is controlled by regulatory circuitry involving the WUSCHEL (WUS) and CLAVATA (CLV1-3) genes. WUS signals from the organizing center (OC) to promote stem cell fate at the meristem apex. Stem cells express the secreted peptide CLV3 that activates a signal transduction cascade to restrict WUS expression, thus providing a feedback mechanism. Stem cell homeostasis is proposed to be achieved by balancing these signals. We tested the dynamics of CLV3 signaling using an inducible gene expression system. We show here that increasing the CLV3 signal can very rapidly repress WUS expression during development, which in turn causes a fast reduction of CLV3 expression. We demonstrate that increased CLV3 signaling restricts meristem growth and promotes allocation of peripheral meristem cells into organ primordia. In addition, we extend the current model for stem cell control by showing that meristem homeostasis tolerates variation in CLV3 levels over a 10-fold range and that high-level CLV3 signaling can be partially compensated with time, indicating that the level of CLV3 expression communicates only limited information on stem cell number to the underlying OC cells. © 2006 American Society of Plant Biologists.},

note = {129},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2-s2.0-12444266422,

title = {Structural integration at the shoot apical meristem: Models, measurements, and experiments},

author = { D. Kwiatkowska},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-12444266422&doi=10.3732%2fajb.91.9.1277&partnerID=40&md5=c05a7aec91b1514a792a620f14181ed8},

doi = {10.3732/ajb.91.9.1277},

issn = {00029122},

year  = {2004},

date = {2004-01-01},

journal = {American Journal of Botany},

volume = {91},

number = {9},

pages = {1277-1293},

abstract = {The shoot apical meristem (SAM) produces stem and initiates leaves. Its structure is maintained despite a continuous flow of cells basipetally from the distal portion of the meristem. The apoplasm and symplasm are the obvious means of cell integration, and their role in chemical cell-to-cell signaling is known. However, the cell wall apoplasm is most likely also involved in a mechanical integration mode, in which mechanical stress and strains (elastic and plastic strain; i.e.; growth) are putative signaling factors. Shoot apex cells grow symplastically and their growth is in general anisotropic. Therefore tensor of growth rates that depends on the displacements caused by growth is the most suitable physical entity to describe growth. The tensor approach introduces the concept of principal directions of growth, i.e., the directions in which growth rates attain extremal values. Because of the symplastic mode of growth, the cell wall pattern within the shoot apical meristem informs us about the sequence and planes of cell divisions and about the deformation of existing walls. In consequence, within the meristem, periclines and anticlines can be recognized, both representing the principal directions of growth.},

note = {47},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2-s2.0-2442601413,

title = {Surface growth at the reproductive shoot apex of Arabidopsis thaliana pin-formed 1 and wild type},

author = { D. Kwiatkowska},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-2442601413&doi=10.1093%2fjxb%2ferh109&partnerID=40&md5=a74477358c8c365d84f34e51099822ba},

doi = {10.1093/jxb/erh109},

issn = {00220957},

year  = {2004},

date = {2004-01-01},

journal = {Journal of Experimental Botany},

volume = {55},

number = {399},

pages = {1021-1032},

abstract = {With the aid of a non-destructive replica method and computational protocol, surface geometry and expansion at the reproductive shoot apex are analysed for pin-formed 1 (pin1) Arabidopsis thaliana and compared with the wild type. The observed complexity of geometry and expansion at the pin1 apex indicates that both components of shoot apex growth, i.e. the meristem self-perpetuation and initiation of lateral organs, are realized by the pin1 apex. The realization of the latter component, however, is only occasionally completed. The pin1 apex is generally dome-shaped, but its curvature is not uniform, especially later during apex ontogeny, when bulges and saddle-shaped regions appear on its periphery. The only saddle-shaped regions at the wild-type shoot apex are creases separating flower primordia from the meristem. Surface expansion at the pin1 apex is faster than at the wild type. In both pin1 and wild type the apex surface is differentiated into regions of various areal strain rates. In the pin1 apex, but not in the wild type, these regions correspond to the geometrically distinguished central and peripheral zones. Expansion of the central zone of the pin1 apex is nearly isotropic and slower than in the peripheral zone. The peripheral zone is differentiated into ring-shaped portions of different expansion anisotropy. The distal portion of this zone expands anisotropically, similar to regions of the wild-type apex periphery, which contact older flower primordia. The proximal portion expands nearly isotropically, like sites of flower initiation in the wild type. The peripheral zone in pin1 is surrounded by a 'basal zone', a sui generis zone, where areal strain rates are low and expansion is anisotropic. The possible relationships between the observed regions of different expansion and the various gene expression patterns in the pin1 apex known from the literature are discussed.},

note = {60},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2-s2.0-0038388938,

title = {Growth and morphogenesis at the vegetative shoot apex of Anagallis arvensis L.},

author = { D. Kwiatkowska and J. Dumais},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0038388938&doi=10.1093%2fjxb%2ferg166&partnerID=40&md5=470c48b9ca488c7ac439bdba22cca841},

doi = {10.1093/jxb/erg166},

issn = {00220957},

year  = {2003},

date = {2003-01-01},

journal = {Journal of Experimental Botany},

volume = {54},

number = {387},

pages = {1585-1595},

abstract = {A non-destructive replica method and a 3-D reconstruction algorithm are used to analyse the geometry and expansion of the shoot apex surface. Surface expansion in the central zone of the apex is slow and nearly isotropic while surface expansion in the peripheral zone is more intense and more anisotropic. Within the peripheral zone, the expansion rate, expansion anisotropy, and the direction of maximal expansion vary according to the age of adjacent leaf primordia. For each plastochron, this pattern of expansion is rotated around the apex by the Fibonacci angle. Early leaf primordium development is divided into four stages: bulging, lateral expansion, separation, and bending. These stages differ in their geometry and expansion pattern. At the bulging stage, the site of primordium initiation shows an intensified expansion that is nearly isotropic. The following stages develop sharp meridional gradients of expansion rates and anisotropy. The adaxial primordium boundary inferred from the surface curvature is shifting until the separation stage, when a crease develops between the primordium and the apex dome. The cells forming the crease, i.e. the future leaf axil, expand along the axil and contract across it. Thus they are arrested in this unique position.},

note = {98},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2-s2.0-0038687169,

title = {Structural organisation, expression, and promoter analysis of a 16R isoform of 14-3-3 protein gene from potato},

author = { J. Szopa and M. Łukaszewicz and A. Aksamit and A. Korobczak and D. Kwiatkowska},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0038687169&doi=10.1016%2fS0981-9428%2803%2900048-2&partnerID=40&md5=bd43d677ff7d98afbf72f14dcb629d17},

doi = {10.1016/S0981-9428(03)00048-2},

issn = {09819428},

year  = {2003},

date = {2003-01-01},

journal = {Plant Physiology and Biochemistry},

volume = {41},

number = {5},

pages = {417-423},

publisher = {ESME - Gauthier-Villars},

abstract = {Six full-length cDNAs encoding 14-3-3 proteins from potato (Solanum tuberosum L. cv. Desiree) plants have been recently isolated and sequenced. Screening of a potato genomic library with the 16R cDNA encoding 14-3-3 protein isoform resulted in the identification and isolation of the respective genomic clone. The gene contains four exons and three introns. Inspection of the promoter sequence of the 16R gene revealed several boxes important for the regulation of the gene expression. The induction of the promoter activity by sucrose, IAA, ABA and salicylic acid has been shown. Dof protein-binding sequences, E-boxes and sequences responsible for developmental regulation are most frequently represented. Northern blot and ftuorometric analyses, as well as the microscopic examination of transgenic potato plants transformed with GUS reporter under 14-3-3 protein promoter, provide evidence for tissue-specific expression and age-dependent promoter activity. Significant GUS expression was observed in young organs or organ portions, as well as in minor vascular bundles of mature organs. © 2003 Éditions scientifiques et médicales Elsevier SAS. All rights reserved.},

note = {9},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2-s2.0-0036328789,

title = {Analysis of surface growth in shoot apices},

author = { J. Dumais and D. Kwiatkowska},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0036328789&doi=10.1046%2fj.1365-313X.2001.01350.x&partnerID=40&md5=12d9dc1f5b353647827e29307d2fbe33},

doi = {10.1046/j.1365-313X.2001.01350.x},

issn = {09607412},

year  = {2002},

date = {2002-01-01},

journal = {Plant Journal},

volume = {31},

number = {2},

pages = {229-241},

abstract = {A salient feature of shoot meristem growth is the maintenance of distinct anatomical and morphological features despite a continuous flux of cells. To investigate how meristem organization is self-perpetuated, we developed a protocol for the analysis of meristem growth in 3-D. Our protocol uses a non-destructive replica method to follow the pattern of cell expansion and cell divisions on the meristem surface over several days. Algorithms to reconstruct the meristem surface and compute its curvature and rate of extension were implemented. We applied this approach to the shoot apical meristem of Anagallis arvensis and showed that a subcellular resolution of extension rates can be achieved. This is the first detailed quantitative analysis of meristem geometry and surface expansion in 3-D. This new approach will be useful to connect cellular activities such as cell expansion, cell division, and differential gene expression with overall meristem morphogenesis.},

note = {90},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2-s2.0-0034399115,

title = {In vivo labelling of Anagallis arvensis L. cells with Green Fluorescent Protein},

author = { M. Łukaszewicz and D. Kwiatkowska},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0034399115&partnerID=40&md5=2996edeefeae464aa281eef7e84c457f},

issn = {00016977},

year  = {2000},

date = {2000-01-01},

journal = {Acta Societatis Botanicorum Poloniae},

volume = {69},

number = {2},

pages = {85-91},

publisher = {Polish Botanical Society},

abstract = {A few methods only enable to follow the fate of plant cells in vivo. One of the most promising is using the Green Fluorescent Protein (GFP). In our preliminary study we set up the experimental system enabling labelling of Anagallis arvensis cells with this marker. We prepared an expression plasmid containing red-shifted gfp with optimised translation start site context, under the control of CaMV 35S transcription promoter. The construct was introduced into A. arvensis cells by particle bombardment. We developed two methods of material preparation for this transformation: in vitro cultured stem internodes with regenerating adventitious shoots (the earliest stages of regeneration); and shoot tips with temporarily exposed apices. The reflected light fluorescence microscope Olympus with the set of filters U-MNB designed for fluorescein detection enables the observation of GFP fluorescence. Both ordinary epidermal cells and stomata guard cells were transformed. Their fluorescence was observed for up to 14 days. Artefacts (autofluorescence of glandular trichomes and faint green glowing of meristematic tissue) could be overcome by the optimisation of the filter set.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2-s2.0-0039525440,

title = {Ontogenetic variation of phyllotaxis and apex geometry in negative shoots of Sedum maximum (L.) Hoffm},

author = { D. Kwiatkowska and J. Florek-Marwitz},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0039525440&partnerID=40&md5=596b143821e8f735b2d28466734028ba},

issn = {00016977},

year  = {1999},

date = {1999-01-01},

journal = {Acta Societatis Botanicorum Poloniae},

volume = {68},

number = {2},

pages = {85-95},

publisher = {Polish Botanical Society},

abstract = {Phyllotaxis of vegetative shoots of Sedum maximum (L.) Hoffm. is variable and unstable. Phyllotactic transitions proceeding either between two whorled, two spiral or a whorled and a spiral pattern occur during shoot ontogeny. A general rule is that in the course of these transitions numbers of contact parastichies increase or much less often diminish. During most common transitions only a single parastichy is added to or subtracted from the already existing contact parastichy pattern. This applies both to the transitions between a spiral and a whorled and to those between two spiral patterns. More parastichies appear only when phyllotaxis changes from one whorled pattern to another. These transitions, however, are the least common in S. maximum. Parameters of apex geometry differ significantly in shoots exhibiting different contact parastichy numbers. The sequence of phyllotactic patterns arranged according to an increasing apical dome area or area ratio, as well as decreasing plastochron ratio (both as defined by Richards) is the same as their sequence based on increasing numbers of contact parastichies. This in turn is the sequence of patterns as they appear during shoot ontogeny. The only parameter which remains relatively constant is the area of the youngest leaf primordium. This implies that during phyllotactic transitions in S. maximum the area ratio changes mainly due to the increase of the apical dome. It seems that in S. maximum this ontogenetic increase of the apical dome, which on the other hand is typical for many plants, somehow differs from these cases where such a change alters only contact parastichy numbers within the same phyllotactic series.},

note = {11},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2-s2.0-0033259667,

title = {Phyllotaxis of vegetative shoots of Anagallis arvensis L. treated in vitro with 6-benzylaminopurine},

author = { D. Kwiatkowska and K. Kromer},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0033259667&partnerID=40&md5=deea8bff3d7e405947ffdc6bc4d36fe5},

issn = {00016977},

year  = {1999},

date = {1999-01-01},

journal = {Acta Societatis Botanicorum Poloniae},

volume = {68},

number = {3},

pages = {183-190},

publisher = {Polish Botanical Society},

abstract = {Application of 6-benzylaminopurine (BA), a synthetic cytokinin, to the growth medium in vitro stimulates the formation of adventitious shoots on stem explants of Anagallis arvensis. They regenerate from dedifferentiating epidermal cells of stem internodes. The process starts from periclinal and anticlinal divisions in a few of neighbouring cells. The amount of adventitious shoots increases with an increasing BA concentration. The BA treatment also affects phyllotaxis, but only of adventitious shoots, and not of normal lateral shoots developing in leaf axils. Leaf arrangement on adventitious shoots is always variable, even on the control medium. Generally, patterns observed in case of in vitro shoots do not differ from those reported earlier for intact A. arvensis plants. BA treatment also leads to the teratologic development, i.e. fasciation and the formation of abnormally shaped leaves, but again in adventitious rather than in normally developing shoots. We postulate that the variability of phyllotaxis characteristic for adventitious shoots and their responce to BA treatment, result from the fact that their apical meristems develop de novo from initially unorganised meristematic centres, whereas meristems of normally developing lateral shoots are well organised from the time of their initiation.},

note = {2},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2-s2.0-0033042724,

title = {Formation of pseudowhorls in Peperomia verticillata (L.) A. Dietr. shoots exhibiting various phyllotactic patterns},

author = { D. Kwiatkowska},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0033042724&doi=10.1006%2fanbo.1999.0875&partnerID=40&md5=c237efc1ee8a9a6033a1cd626d6d99bf},

doi = {10.1006/anbo.1999.0875},

issn = {03057364},

year  = {1999},

date = {1999-01-01},

journal = {Annals of Botany},

volume = {83},

number = {6},

pages = {675-685},

publisher = {Academic Press},

abstract = {Pseudowhorls are composed of leaves attached at almost equal levels and separated by single fully elongated internodes. In Peperomia verticillata, pseudowhorls form regularly in shoots exhibiting both spiral and truly whorled patterns of phyllotaxis. In spiral systems, they are composed of successive leaves positioned on the ontogenetic helix. In whorled phyllotaxis, leaves of two adjacent whorls occur at almost the same level and this way form a pseudowhorl. The number of leaves per pseudowhorl depends on the type of phyllotactic pattern and also the system of primordia packing. In all the shoots, regardless of the type of phyllotaxis, the number of leaves per pseudowhorl equals the number of leaf primordia in physical contact with the apical dome. It is the same as the higher number in contact parastichy pairs in spiral patterns or the number of orthostichies in whorled phyllotaxis. The pseudowhorled pattern is already manifested in the arrangement of leaf primordia. In spiral and whorled phyllotaxis the plastochron ratio calculated for primordia or whorls belonging to adjacent pseudowhorls is always higher than that calculated for members of one pseudowhorl. Moreover, angular distances between primordia of one pseudowhorl in spiral patterns are more uniform than expected in Fibonacci phyllotaxis. These observations were made on plants both growing in pots and cultured in vitro. 6-Benzylaminopurine, a synthetic cytokinin, added to the medium increases the mean number of leaves per pseudowhorl. It seems that this effect is indirect: phyllotaxis changes first rather than the destiny of a particular internode in a process of selective elongation.},

note = {17},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2-s2.0-0031378097,

title = {Intraspecific Variation of Phyllotaxis Stability in Anagallis Arvensis},

author = { D. Kwiatkowska},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0031378097&partnerID=40&md5=b2832621d35f5ebf1bbd75f7a2cfeb3c},

issn = {00016977},

year  = {1997},

date = {1997-01-01},

journal = {Acta Societatis Botanicorum Poloniae},

volume = {66},

number = {3-4},

pages = {259-271},

publisher = {Polish Botanical Society},

abstract = {Qualitative transformations of phyllotaxis in Anagallis arvensis occur typically during the generative phase of development. In the vegetative phase phyllotaxis usually does not change. An exception to this rule is one peculiar population of Anagallis arvensis, belonging to a pink-flowered form cornea, in which phyllotaxis often transforms in both the generative and vegetative phase of development. The presence of a relatively large number of vegetative transitions, virtually absent in two control red-flowered populations of form arvensis, is accompanied also by the higher frequency of generative transitions. This might be a result of a genetically determined instability of shoot apex geometry. It has been proved experimentally that changing conditions of growth affect the transition frequencies and the time lapse from the beginning of either the vegetative or generative phase to the transition (measured in plastochrons). A comparison of two types of transitions shows that divergence changes are less abrupt in vegetative transitions. The differences between the two types also pertain to the vertical spacing of leaves and to the pattern formed by leaf bases and wings on the stem surface in the transition zone.},

note = {9},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2-s2.0-84988672652,

title = {Changes of phyllotaxis in anagallis arvensis L.},

author = { D. Kwiatkowska},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-84988672652&doi=10.5586%2fasbp.1995.041&partnerID=40&md5=d664268b977d1193020a2c5d455507a7},

doi = {10.5586/asbp.1995.041},

issn = {00016977},

year  = {1995},

date = {1995-01-01},

journal = {Acta Societatis Botanicorum Poloniae},

volume = {64},

number = {4},

pages = {319-325},

publisher = {Polskie Towarzystwo Botaniczne},

abstract = {During the ontogeny of Anagallis spontaneous changes of phyllotaxis appear in a regular sequence. The initial decussate pattern is followed by spiral Fibonacci phyllotaxis, this in turn, by a trimerous pattern, and finally Lucas spiral phyllotaxis is formed. In the course of the first and most common phyllotactic transition, from the decussate to spiral Fibonacci pattern, changes in primordia arrangement occur only within a limited sector of the apex circumference. In the complementary sector, primordia emerge as if the decussate phyllotaxis continued. It is likely that similar circumferential discontinuity accounts for further transitions. The common ontogenetic sequence of patterns in Anagallis is such that, theoretically, each transition requires minimal changes in shoot apex geometry. Although the meristem in Anagallis is able to produce primordia either in whorls or spirally, the elongated shoots of this plant seem to have leaves exclusively in whorls. It appeared that in shoots with an initially spiral pattern, leaves can be clustered in pseudo-whorls due to the uneven internode elongation. Pseudo- whorls are composed usually of three (Fibonacci) or four (Lucas) leaves of successive nodes. The number of leaves in a pseudo-whorl equals the number of leaves positioned on one revolution of the ontogenetic helix, which is different in these two spiral patterns. In shoot apices with whorled phyllotaxis, the leaf and flower primordia of a whorl are of different size. On elongated shoots, flower buds emerging in the axils of leaves of one whorl also differ in size.},

note = {22},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2-s2.0-84988664768,

title = {Ontogenetic changes in the shoot primary vasculature of an agalus arvensis L.},

author = { D. Kwiatkowska},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-84988664768&doi=10.5586%2fasbp.1995.028&partnerID=40&md5=7ddf9e434b363e48a0153c81dea0718c},

doi = {10.5586/asbp.1995.028},

issn = {00016977},

year  = {1995},

date = {1995-01-01},

journal = {Acta Societatis Botanicorum Poloniae},

volume = {64},

number = {3},

pages = {213-222},

publisher = {Polskie Towarzystwo Botaniczne},

abstract = {Ontogenetic charges in the primary vasculature of Anagalis shoots are strictly related to phyllotaxis. During the ontogeny of Anagallis, whorled and spiral phyllotactic patterns appear alternately in a regular sequence. The initial decussate phyllotaxis is transformed into the spiral Fibonacci, and then further into trimerous pattern. This in turn may change into the spiral Lucas phyllotaxis. Sporadically the immediate transition from the decussate to trimerous phyllotaxis takes place. The vascular system in Anagallis is always closed, despite that both whorled and spiral phyllotaxes are present. Also the number of vascular traces diverging to the leaf is constant. In the course of a single phyllotactic transition, there is an increase in the number of vascular sympodia and in the number of leaf traces present in the vascular cylinder. Usually only one single sympodium and one or two traces are added to the system. The immediate addition of two sympodia occurs only during infrequent transition from the decussate to trimerous pattern. The increase in the number of sympodia is most often simultaneous with the phyllotactic transition, however, when the trimerous pattern is transformed into the spiral Lucas, the increase is delayed, sometimes for as much as ten plastochrons. In shoots with changing phyllotaxis, a sector within the vascular cylinder can be distinguished, in which the leaf traces are arranged as if the previous phyllotactic pattern continued, whereas rearrangement of traces takes place at the same level but in the complementary sector. This is in agreement with the concept of discontinuous circumferential changes in the shoot apex being responsible for qualitative transformations of phyllotaxis.},

note = {4},

keywords = {},

pubstate = {published},

tppubtype = {article}

}