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Research article - Peer-reviewed, 2021

Xyloglucan Remodeling Defines Auxin-Dependent Differential Tissue Expansion in Plants

Velasquez, Silvia Melina; Guo, Xiaoyuan; Gallemi, Marcal; Aryal, Bibek; Venhuizen, Peter; Barbez, Elke; Duenser, Kai Alexander; Darino, Martin; Pencik, Ales; Novak, Ondrej; Kalyna, Maria; Mouille, Gregory; Benkova, Eva; Bhalerao, Rishikesh; Mravec, Jozef; Kleine-Vehn, Jurgen

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.

Keywords

auxin; growth; cell wall; xyloglucans; hypocotyls; gravitropism

Published in

International Journal of Molecular Sciences
2021, volume: 22, number: 17, article number: 9222
Publisher: MDPI

Authors' information

Velasquez, Silvia Melina
University of Bodenkultur Wien
Guo, Xiaoyuan
University of Copenhagen
Gallemi, Marcal
Institute of Science and Technology - Austria
Swedish University of Agricultural Sciences, Department of Forest Genetics and Plant Physiology
Venhuizen, Peter
University of Bodenkultur Wien
Barbez, Elke
University of Bodenkultur Wien
Barbez, Elke
University of Freiburg
Duenser, Kai Alexander
University of Bodenkultur Wien
Darino, Martin
University of Bodenkultur Wien
Pencik, Ales
Institute of Experimental Botany of the Czech Academy of Sciences
Pencik, Ales
Palacky University Olomouc
Swedish University of Agricultural Sciences, Department of Forest Genetics and Plant Physiology
Palacký University Olomouc
Kalyna, Maria
University of Bodenkultur Wien
Mouille, Gregory
Universite Paris Saclay
Benkova, Eva
Institute of Science and Technology - Austria
Swedish University of Agricultural Sciences, Department of Forest Genetics and Plant Physiology
Mravec, Jozef
University of Copenhagen
Kleine-Vehn, Jurgen
University of Freiburg

UKÄ Subject classification

Biochemistry and Molecular Biology

Publication Identifiers

DOI: https://doi.org/10.3390/ijms22179222

URI (permanent link to this page)

https://res.slu.se/id/publ/113710