Pectin Chemistry and Cellulose Crystallinity Govern Pavement Cell Morphogenesis in a Multi-Step Mechanism.

Plant Physiology
Bara AltartouriAnja Geitmann

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 ce...Continue Reading

Citations

Aug 31, 2019·The Plant Journal : for Cell and Molecular Biology·Tian ZhangDaniel J Cosgrove
Jan 17, 2020·Journal of Microscopy·Sarah Robinson, Pauline Durand-Smet
Oct 19, 2019·International Journal of Molecular Sciences·Yanqiu YangDeshu Lin
Aug 21, 2020·Development·Arun Sampathkumar
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Jun 10, 2020·Trends in Plant Science·Dangquan Zhang, Baohong Zhang
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