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Plant Physiol. 2018 Oct;178(2):864-875. doi: 10.1104/pp.18.00718. Epub 2018 Aug 23.

Three Auxin Response Factors Promote Hypocotyl Elongation.

Author information

1
Department of Biology, University of North Carolina, Chapel Hill, North Carolina 27599-3280 jreed@email.unc.edu.
2
Curriculum in Genetics and Molecular Biology, University of North Carolina, Chapel Hill, North Carolina 27599-3280.
3
Department of Biology, University of North Carolina, Chapel Hill, North Carolina 27599-3280.
4
Department of Biology, Utrecht University, 3584 CH Utrecht, The Netherlands.

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.

PMID:
30139794
PMCID:
PMC6181040
DOI:
10.1104/pp.18.00718
[Indexed for MEDLINE]
Free PMC Article

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