A model of crosslink kinetics in the expanding plant cell wall: yield stress and enzyme action.

Journal of Theoretical Biology
R J DysonO E Jensen

Abstract

The plant primary cell wall is a composite material containing stiff cellulose microfibrils that are embedded within a pectin matrix and crosslinked through a network of hemicellulose polymers. This microstructure endows the wall with nonlinear anisotropic mechanical properties and allows enzymatic regulation of expansive cell growth. We present a mathematical model of hemicellulose crosslink dynamics in an expanding cell wall incorporating strain-enhanced breakage and enzyme-mediated crosslink kinetics. The model predicts the characteristic yielding behaviour in the relationship between stress and strain-rate seen experimentally, and suggests how the effective yield and extensibility of the wall depend on microstructural parameters and on the action of enzymes of the XTH and expansin families. The model suggests that the yielding behaviour encapsulated in the classical Lockhart equation can be explained by the strongly nonlinear dependence of crosslink breakage rate on crosslink elongation. The model also demonstrates how enzymes that target crosslink binding can be effective in softening the wall in its pre-yield state, whereas its post-yield extensibility is determined primarily by the pectin matrix.

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Citations

Jan 15, 2014·PLoS Computational Biology·Behruz BozorgHenrik Jönsson
Sep 26, 2013·PloS One·Adelin BarbacciVincent Magnenet
Aug 6, 2013·Journal of Experimental Botany·Tobias I Baskin, Oliver E Jensen
Jul 9, 2014·Annual Review of Cell and Developmental Biology·Olivier AliJan Traas
Jan 23, 2016·Current Opinion in Plant Biology·Siobhan A Braybrook, Henrik Jönsson
Dec 23, 2015·Journal of Experimental Botany·Amir J Bidhendi, Anja Geitmann
Oct 16, 2015·Journal of Plant Research·Naoki ShinoharaHiroo Fukuda
Mar 19, 2016·Journal of Experimental Botany·Gleb E YakubovJason R Stokes
Sep 17, 2013·The New Phytologist·Luke BraidwoodKeiko Sugimoto
Jun 12, 2013·Biophysical Journal·Gaurav MisraKerwyn Casey Huang
Jan 27, 2015·Progress in Biophysics and Molecular Biology·T C Hodgman, I Ajmera
Aug 19, 2014·Frontiers in Plant Science·Shweta KalveGerrit T S Beemster
Jan 24, 2015·Plant & Cell Physiology·Yong Bum Park, Daniel J Cosgrove
Nov 3, 2016·Bulletin of Mathematical Biology·Mariya Ptashnyk, Brian Seguin
Nov 16, 2016·Physical Biology·Behruz BozorgHenrik Jönsson
Sep 14, 2018·Journal of Mathematical Biology·Hadrien OliveriOlivier Ali
May 28, 2019·Journal of Experimental Botany·Euan T SmithersRosemary J Dyson
Mar 3, 2015·Physiology·Oliver E Jensen, John A Fozard
Dec 27, 2016·Frontiers in Plant Science·Ulyana ZubairovaNikolay Kolchanov
Feb 14, 2020·International Journal of Molecular Sciences·Derek T A LamportMarcia J Kieliszewski
Aug 21, 2020·Development·Arun Sampathkumar
Sep 8, 2021·The New Phytologist·Jacques Dumais
Nov 8, 2017·Developmental Cell·Mateusz MajdaStéphanie Robert

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