Mechanochemical Polarization of Contiguous Cell Walls Shapes Plant Pavement Cells.

Abstract:

:The epidermis of aerial plant organs is thought to be limiting for growth, because it acts as a continuous load-bearing layer, resisting tension. Leaf epidermis contains jigsaw puzzle piece-shaped pavement cells whose shape has been proposed to be a result of subcellular variations in expansion rate that induce local buckling events. Paradoxically, such local compressive buckling should not occur given the tensile stresses across the epidermis. Using computational modeling, we show that the simplest scenario to explain pavement cell shapes within an epidermis under tension must involve mechanical wall heterogeneities across and along the anticlinal pavement cell walls between adjacent cells. Combining genetics, atomic force microscopy, and immunolabeling, we demonstrate that contiguous cell walls indeed exhibit hybrid mechanochemical properties. Such biochemical wall heterogeneities precede wall bending. Altogether, this provides a possible mechanism for the generation of complex plant cell shapes.

journal_name

Dev Cell

journal_title

Developmental cell

authors

Majda M,Grones P,Sintorn IM,Vain T,Milani P,Krupinski P,Zagórska-Marek B,Viotti C,Jönsson H,Mellerowicz EJ,Hamant O,Robert S

doi

10.1016/j.devcel.2017.10.017

subject

Has Abstract

pub_date

2017-11-06 00:00:00

pages

290-304.e4

issue

3

eissn

1534-5807

issn

1878-1551

pii

S1534-5807(17)30830-4

journal_volume

43

pub_type

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