Three Auxin Response Factors Promote Hypocotyl Elongation

Jason W. Reed; Miin Feng Wu; Paul H. Reeves; Charles Hodgens; Vandana Yadav; Scott Hayes; Ronald Pierik

doi:10.1104/pp.18.00718

Three Auxin Response Factors Promote Hypocotyl Elongation

Jason W. Reed, Miin Feng Wu, Paul H. Reeves, Charles Hodgens, Vandana Yadav, Scott Hayes, Ronald Pierik

Sub Plant Ecophysiology

University of North Carolina at Chapel Hill

Research output: Contribution to journal › Article › Academic › peer-review

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.

Original language	English
Pages (from-to)	864-875
Number of pages	12
Journal	Plant Physiology
Volume	178
Issue number	2
DOIs	https://doi.org/10.1104/pp.18.00718
Publication status	Published - 1 Oct 2018

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title = "Three Auxin Response Factors Promote Hypocotyl Elongation",

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.",

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AU - Reed, Jason W.

AU - Wu, Miin Feng

AU - Reeves, Paul H.

AU - Hodgens, Charles

AU - Yadav, Vandana

AU - Hayes, Scott

AU - Pierik, Ronald

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AB - 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.

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Three Auxin Response Factors Promote Hypocotyl Elongation

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