Xyloglucan Remodeling Defines Auxin-Dependent Differential Tissue Expansion in Plants

Overview

Journal Int J Mol Sci

Publisher MDPI

Specialties Biochemistry
Chemistry
Molecular Biology

Date 2021 Sep 10

PMID 34502129

Citations 5

Authors

Silvia Melina Velasquez

Xiaoyuan Guo

Marcal Gallemi

Bibek Aryal

Peter Venhuizen

Elke Barbez

Kai Alexander Dunser

Martin Darino

Ales Pencik

Ondrej Novak

Maria Kalyna

Gregory Mouille

Eva Benkova

Rishikesh P Bhalerao

Jozef Mravec

Jurgen Kleine-Vehn

Affiliations

Soon will be listed here.

Abstract

Size control is a fundamental question in biology, showing incremental complexity in plants, whose cells possess a rigid cell wall. The phytohormone auxin is a vital growth regulator with central importance for differential growth control. Our results indicate that auxin-reliant growth programs affect the molecular complexity of xyloglucans, the major type of cell wall hemicellulose in eudicots. Auxin-dependent induction and repression of growth coincide with reduced and enhanced molecular complexity of xyloglucans, respectively. In agreement with a proposed function in growth control, genetic interference with xyloglucan side decorations distinctly modulates auxin-dependent differential growth rates. Our work proposes that auxin-dependent growth programs have a spatially defined effect on xyloglucan's molecular structure, which in turn affects cell wall mechanics and specifies differential, gravitropic hypocotyl growth.

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