Back to Search
Start Over
Three Auxin Response Factors Promote Hypocotyl Elongation.
- 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.)
- Subjects :
- Arabidopsis genetics
Arabidopsis growth & development
Arabidopsis radiation effects
Arabidopsis Proteins genetics
Hypocotyl genetics
Hypocotyl growth & development
Hypocotyl physiology
Hypocotyl radiation effects
Light
Transcription Factors genetics
Transcription Factors metabolism
Arabidopsis physiology
Arabidopsis Proteins metabolism
Gene Expression Regulation, Plant
Indoleacetic Acids metabolism
Plant Growth Regulators metabolism
Subjects
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