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 Celljournal_title
Developmental cellauthors
Majda M,Grones P,Sintorn IM,Vain T,Milani P,Krupinski P,Zagórska-Marek B,Viotti C,Jönsson H,Mellerowicz EJ,Hamant O,Robert Sdoi
10.1016/j.devcel.2017.10.017subject
Has Abstractpub_date
2017-11-06 00:00:00pages
290-304.e4issue
3eissn
1534-5807issn
1878-1551pii
S1534-5807(17)30830-4journal_volume
43pub_type
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