1. FERONIA regulates salt tolerance in Arabidopsis by controlling photorespiratory flux.
- Author
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Jiang W, Wang Z, Li Y, Liu X, Ren Y, Li C, Luo S, Singh RM, Li Y, Kim C, and Zhao C
- Subjects
- Gene Expression Regulation, Plant, Glycine analogs & derivatives, Glycine metabolism, Glycine pharmacology, Glycine Hydroxymethyltransferase metabolism, Glycine Hydroxymethyltransferase genetics, Mutation, Phosphorylation, Photosynthesis, Proline metabolism, Protein Serine-Threonine Kinases, Salt Stress, Glutamates chemistry, Glutamates metabolism, Arabidopsis genetics, Arabidopsis physiology, Arabidopsis metabolism, Arabidopsis Proteins metabolism, Arabidopsis Proteins genetics, Salt Tolerance genetics
- Abstract
Photorespiration is an energetically costly metabolic pathway in plants that responds to environmental stresses. The molecular basis of the regulation of the photorespiratory cycle under stress conditions remains unclear. Here, we discovered that FERONIA (FER) regulates photorespiratory flow under salt stress in Arabidopsis (Arabidopsis thaliana). FER mutation results in hypersensitivity to salt stress, but disruption of ferredoxin-dependent glutamate synthase 1 (GLU1), an enzyme that participates in the photorespiratory pathway by producing glutamate, greatly suppresses fer-4 hypersensitivity to salt stress primarily due to reduced glycine yield. In contrast, disrupting mitochondrial serine hydroxymethyltransferase1 (SHM1), which is supposed to increase glycine levels by hampering the conversion of glycine to serine in the photorespiratory cycle, aggravates fer-4 hypersensitivity to salt stress. Biochemical data show that FER interacts with and phosphorylates SHM1, and this phosphorylation modulates SHM1 stability. Additionally, the production of proline and its intermediate △1-pyrroline-5-carboxylate (P5C), which are both synthesized from glutamate, also contributes to fer-4 hypersensitivity to salt stress. In conclusion, this study elucidates the functional mechanism of FER in regulating salt tolerance by modulating photorespiratory flux, which greatly broadens our understanding of how plants adapt to high salinity., Competing Interests: Conflict of interest statement. None declared., (© The Author(s) 2024. Published by Oxford University Press on behalf of American Society of Plant Biologists. All rights reserved. For commercial re-use, please contact reprints@oup.com for reprints and translation rights for reprints. All other permissions can be obtained through our RightsLink service via the Permissions link on the article page on our site—for further information please contact journals.permissions@oup.com.)
- Published
- 2024
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