Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 119, Issue 1, Pages -Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.2119258119
Keywords
plant cell wall; cell wall integrity; abscisic acid; THE1
Categories
Funding
- NIH
- Australian Research Council [DE140100946]
- US Department of Agriculture National Institute of Food and Agriculture (Hatch Project) [1014908]
- European Economic Area Grant [7F14155 CYTOWALL]
- Estonian Research Council [PRG433]
- European Regional Development Fund (Center of Excellence in Molecular Cell Engineering)
- Norges teknisk-naturvitenskapelige universitet
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Plant cells have a mechanism to maintain the integrity of their cell walls, which involves adaptive responses to wall damage. The cell wall integrity sensor THESEUS1 plays a key role in regulating mechanical properties, abscisic acid production, and jasmonic acid production in response to wall damage. This mechanism coordinates changes in cell wall stiffness and turgor pressure.
Plant cells can be distinguished from animal cells by their cell walls and high-turgor pressure. Although changes in turgor and the stiffness of cell walls seem coordinated, we know little about the mechanism responsible for coordination. Evidence has accumulated that plants, like yeast, have a dedicated cell wall integrity maintenance mechanism. It monitors the functional integrity of the wall and maintains integrity through adaptive responses induced by cell wall damage arising during growth, development, and interactions with the environment. These adaptive responses include osmosensitive induction of phytohormone production, defense responses, as well as changes in cell wall composition and structure. Here, we investigate how the cell wall integrity maintenance mechanism coordinates changes in cell wall stiffness and turgor in Arabidopsis thaliana. We show that the production of abscisic acid (ABA), the phytohormone-modulating turgor pressure, and responses to drought depend on the presence of a functional cell wall. We find that the cell wall integrity sensor THESEUS1 modulates mechanical properties of walls, turgor loss point, ABA biosynthesis, and ABA-controlled processes. We identify RECEPTOR-LIKE PROTEIN 12 as a component of cell wall integrity maintenance-controlling, cell wall damage-induced jasmonic acid (JA) production. We propose that THE1 is responsible for coordinating changes in turgor pressure and cell wall stiffness.
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