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    Pectin chemistry and cellulose crystallinity govern pavement cell morphogenesis in a multi-step mechanism

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    Date
    2019-08-29
    Author
    Altartouri, Bara  Concept link
    Bidhendi, Amir J.  Concept link
    Tani, Tomomi  Concept link
    Suzuki, Johnny  Concept link
    Conrad, Christina  Concept link
    Chebli, Youssef  Concept link
    Liu, Na  Concept link
    Karunakaran, Chithra  Concept link
    Scarcelli, Giuliano  Concept link
    Geitmann, Anja  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/24524
    As published
    https://doi.org/10.1104/pp.19.00303
    DOI
    10.1104/pp.19.00303
    Abstract
    Simple plant cell morphologies, such as cylindrical shoot cells, are determined by the extensibility pattern of the primary cell wall, which is thought to be largely dominated by cellulose microfibrils, but the mechanism leading to more complex shapes, such as the interdigitated patterns in the epidermis of many eudicotyledon leaves, is much less well understood. Details about the manner in which cell wall polymers at the periclinal wall regulate the morphogenetic process in epidermal pavement cells and mechanistic information about the initial steps leading to the characteristic undulations in the cell borders are elusive. Here, we used genetics and recently developed cell mechanical and imaging methods to study the impact of the spatio-temporal dynamics of cellulose and homogalacturonan pectin distribution during lobe formation in the epidermal pavement cells of Arabidopsis (Arabidopsis thaliana) cotyledons. We show that nonuniform distribution of cellulose microfibrils and demethylated pectin coincides with spatial differences in cell wall stiffness but may intervene at different developmental stages. We also show that lobe period can be reduced when demethyl-esterification of pectins increases under conditions of reduced cellulose crystallinity. Our data suggest that lobe initiation involves a modulation of cell wall stiffness through local enrichment in demethylated pectin, whereas subsequent increase in lobe amplitude is mediated by the stress-induced deposition of aligned cellulose microfibrils. Our results reveal a key role of noncellulosic polymers in the biomechanical regulation of cell morphogenesis.
    Description
    Author Posting. ©American Society of Plant Biologists, 2019. This article is posted here by permission of [publisher] for personal use, not for redistribution. The definitive version was published in Altartouri, B., Bidhendi, A. J., Tani, T., Suzuki, J., Conrad, C., Chebli, Y., Liu, N., Karunakaran, C., Scarcelli, G., & Geitmann, A. Pectin chemistry and cellulose crystallinity govern pavement cell morphogenesis in a multi-step mechanism. Plant Physiology, 181(1), (2019): 127-141, doi:10.1104/pp.19.00303.
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    Suggested Citation
    Altartouri, B., Bidhendi, A. J., Tani, T., Suzuki, J., Conrad, C., Chebli, Y., Liu, N., Karunakaran, C., Scarcelli, G., & Geitmann, A. (2019). Pectin chemistry and cellulose crystallinity govern pavement cell morphogenesis in a multi-step mechanism. Plant Physiology, 181(1), 127-141.
     
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