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Mechanochemical feedback mediates tissue bending required for seedling emergence

Jonsson, Kristoffer and Lathe, Rahul Shivanand and Kierzkowski, Daniel and Routier-Kierzkowska, Anne-Lise and Hamant, Olivier and Bhalerao, Rishikesh P. (2021). Mechanochemical feedback mediates tissue bending required for seedling emergence. Current Biology. 31 , 1154-1164
[Research article]

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Abstract

Tissue bending is vital to plant development, as exemplified by apical hook formation during seedling emergence by bending of the hypocotyl. How tissue bending is coordinated during development remains poorly understood, especially in plants where cells are attached via rigid cell walls. Asymmetric distribution of the plant hormone auxin underlies differential cell elongation during apical hook formation. Yet the underlying mechanism remains unclear. Here, we demonstrate spatial correlation between asymmetric auxin distribution, methylesterified homogalacturonan (HG) pectin, and mechanical properties of the epidermal layer of the hypocotyl in Arabidopsis. Genetic and cell biological approaches show that this mechanochemical asymmetry is essential for differential cell elongation. We show that asymmetric auxin distribution underlies differential HG methylesterification, and conversely changes in HG methylesterification impact the auxin response domain. Our results suggest that a positive feedback loop between auxin distribution and HG methylesterification underpins asymmetric cell wall mechanochemical properties to promote tissue bending and seedling emergence.

Authors/Creators:Jonsson, Kristoffer and Lathe, Rahul Shivanand and Kierzkowski, Daniel and Routier-Kierzkowska, Anne-Lise and Hamant, Olivier and Bhalerao, Rishikesh P.
Title:Mechanochemical feedback mediates tissue bending required for seedling emergence
Series Name/Journal:Current Biology
Year of publishing :2021
Volume:31
Page range:1154-1164
Number of Pages:11
ISSN:0960-9822
Language:English
Publication Type:Research article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 106 Biological Sciences (Medical to be 3 and Agricultural to be 4) > Developmental Biology
(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 404 Agricultural Biotechnology > Plant Biotechnology
URN:NBN:urn:nbn:se:slu:epsilon-p-109975
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-109975
Additional ID:
Type of IDID
DOI10.1016/j.cub.2020.12.016
Web of Science (WoS)000632810300003
ID Code:23289
Faculty:S - Faculty of Forest Sciences
Department:(S) > Dept. of Forest Genetics and Plant Physiology
Deposited By: SLUpub Connector
Deposited On:19 Apr 2021 09:26
Metadata Last Modified:19 Apr 2021 09:31

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