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Three Auxin Response Factors Promote Hypocotyl Elongation.

Authors :
Reed JW
Wu MF
Reeves PH
Hodgens C
Yadav V
Hayes S
Pierik R
Source :
Plant physiology [Plant Physiol] 2018 Oct; Vol. 178 (2), pp. 864-875. Date of Electronic Publication: 2018 Aug 23.
Publication Year :
2018

Abstract

The hormone auxin regulates growth largely by affecting gene expression. By studying Arabidopsis ( Arabidopsis thaliana ) mutants deficient in AUXIN RESPONSE FACTORS (ARFs), we have identified three ARF proteins that are required for auxin-responsive hypocotyl elongation. Plants deficient in these factors have reduced responses to environmental conditions that increase auxin levels, including far-red-enriched light and high temperature. Despite having decreased auxin responses, the ARF-deficient plants responded to brassinosteroid and gibberellin, indicating that different hormones can act partially independently. Aux/IAA proteins, encoded by IAA genes, interact with ARF proteins to repress auxin response. Silencing expression of multiple IAA genes increased hypocotyl elongation, suggesting that Aux/IAA proteins modulate ARF activity in hypocotyls in a potential negative feedback loop.<br /> (© 2018 American Society of Plant Biologists. All rights reserved.)

Details

Language :
English
ISSN :
1532-2548
Volume :
178
Issue :
2
Database :
MEDLINE
Journal :
Plant physiology
Publication Type :
Academic Journal
Accession number :
30139794
Full Text :
https://doi.org/10.1104/pp.18.00718