Abscisic acid modulates neighbor proximity-induced leaf hyponasty in Arabidopsis.

Details

Serval ID
serval:BIB_A65BC3E6662D
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
Abscisic acid modulates neighbor proximity-induced leaf hyponasty in Arabidopsis.
Journal
Plant physiology
Author(s)
Michaud O., Krahmer J., Galbier F., Lagier M., Galvão V.C., Ince Y.Ç., Trevisan M., Knerova J., Dickinson P., Hibberd J.M., Zeeman S.C., Fankhauser C.
ISSN
1532-2548 (Electronic)
ISSN-L
0032-0889
Publication state
Published
Issued date
02/01/2023
Peer-reviewed
Oui
Volume
191
Number
1
Pages
542-557
Language
english
Notes
Publication types: Journal Article
Publication Status: ppublish
Abstract
Leaves of shade-avoiding plants such as Arabidopsis (Arabidopsis thaliana) change their growth pattern and position in response to low red to far-red ratios (LRFRs) encountered in dense plant communities. Under LRFR, transcription factors of the phytochrome-interacting factor (PIF) family are derepressed. PIFs induce auxin production, which is required for promoting leaf hyponasty, thereby favoring access to unfiltered sunlight. Abscisic acid (ABA) has also been implicated in the control of leaf hyponasty, with gene expression patterns suggesting that LRFR regulates the ABA response. Here, we show that LRFR leads to a rapid increase in ABA levels in leaves. Changes in ABA levels depend on PIFs, which regulate the expression of genes encoding isoforms of the enzyme catalyzing a rate-limiting step in ABA biosynthesis. Interestingly, ABA biosynthesis and signaling mutants have more erect leaves than wild-type Arabidopsis under white light but respond less to LRFR. Consistent with this, ABA application decreases leaf angle under white light; however, this response is inhibited under LRFR. Tissue-specific interference with ABA signaling indicates that an ABA response is required in different cell types for LRFR-induced hyponasty. Collectively, our data indicate that LRFR triggers rapid PIF-mediated ABA production. ABA plays a different role in controlling hyponasty under white light than under LRFR. Moreover, ABA exerts its activity in multiple cell types to control leaf position.
Keywords
Arabidopsis/metabolism, Abscisic Acid/pharmacology, Abscisic Acid/metabolism, Arabidopsis Proteins/genetics, Arabidopsis Proteins/metabolism, Transcription Factors/genetics, Transcription Factors/metabolism, Plant Leaves/genetics, Plant Leaves/metabolism, Phytochrome/metabolism, Gene Expression Regulation, Plant
Pubmed
Web of science
Open Access
Yes
Create date
04/10/2022 10:42
Last modification date
11/01/2023 6:52
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