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Touch-induced seedling morphological changes are determined by ethylene-regulated pectin degradation.

Authors
  • Wu, Qingqing1
  • Li, Yue1
  • Lyu, Mohan1
  • Luo, Yiwen1
  • Shi, Hui2
  • Zhong, Shangwei3
  • 1 State Key Laboratory of Protein and Plant Gene Research, School of Life Sciences, Peking University, Beijing 100871, China. , (China)
  • 2 College of Life Sciences, Capital Normal University, Beijing 100048, China. , (China)
  • 3 State Key Laboratory of Protein and Plant Gene Research, School of Life Sciences, Peking University, Beijing 100871, China. [email protected] , (China)
Type
Published Article
Journal
Science Advances
Publisher
American Association for the Advancement of Science (AAAS)
Publication Date
Nov 01, 2020
Volume
6
Issue
48
Identifiers
DOI: 10.1126/sciadv.abc9294
PMID: 33246960
Source
Medline
Language
English
License
Unknown

Abstract

How mechanical forces regulate plant growth is a fascinating and long-standing question. After germination underground, buried seedlings have to dynamically adjust their growth to respond to mechanical stimulation from soil barriers. Here, we designed a lid touch assay and used atomic force microscopy to investigate the mechanical responses of seedlings during soil emergence. Touching seedlings induced increases in cell wall stiffness and decreases in cell elongation, which were correlated with pectin degradation. We revealed that PGX3, which encodes a polygalacturonase, mediates touch-imposed alterations in the pectin matrix and the mechanics of morphogenesis. Furthermore, we found that ethylene signaling is activated by touch, and the transcription factor EIN3 directly associates with PGX3 promoter and is required for touch-repressed PGX3 expression. By uncovering the link between mechanical forces and cell wall remodeling established via the EIN3-PGX3 module, this work represents a key step in understanding the molecular framework of touch-induced morphological changes. Copyright © 2020 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).

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