Three Auxin Response Factors Promote Hypocotyl Elongation | Zendy

Jason W. Reed | Zendy; MiinFeng Wu | Zendy; Paul H. Reeves | Zendy; Charles Hodgens | Zendy; Vandana Yadav | Zendy; Scott Hayes | Zendy; Ronald Pierik | Zendy

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Three Auxin Response Factors Promote Hypocotyl Elongation

Author(s) -

Jason W. Reed,

MiinFeng Wu,

Paul H. Reeves,

Charles Hodgens,

Vandana Yadav,

Scott Hayes,

Ronald Pierik

Publication year - 2018

Publication title -

plant physiology

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 3.554

H-Index - 312

eISSN - 1532-2548

pISSN - 0032-0889

DOI - 10.1104/pp.18.00718

Subject(s) - auxin , hypocotyl , brassinosteroid , arabidopsis , arabidopsis thaliana , gibberellin , biology , microbiology and biotechnology , mutant , plant hormone , shade avoidance , elongation , botany , biochemistry , gene , metallurgy , materials science , ultimate tensile strength

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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