Three Auxin Response Factors Promote Hypocotyl Elongation

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 fac...

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Bibliographic Details
Published in:Plant physiology (Bethesda) 2018-10, Vol.178 (2), p.864-875
Main Authors: Reed, Jason W., Wu, Miin-Feng, Reeves, Paul H., Hodgens, Charles, Yadav, Vandana, Hayes, Scott, Pierik, Ronald
Format: Article
Language:English
Subjects:
Arabidopsis - genetics
Arabidopsis - growth & development
Arabidopsis - physiology
Arabidopsis - radiation effects
Arabidopsis Proteins - genetics
Arabidopsis Proteins - metabolism
Gene Expression Regulation, Plant
Hypocotyl - genetics
Hypocotyl - growth & development
Hypocotyl - physiology
Hypocotyl - radiation effects
Indoleacetic Acids - metabolism
Light
Plant Growth Regulators - metabolism
SIGNALING AND RESPONSE
Transcription Factors - genetics
Transcription Factors - metabolism
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Summary: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.
ISSN:0032-0889
1532-2548
DOI:10.1104/pp.18.00718