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Plant Cell. 2002 Feb;14(2):301-19.

Arabidopsis SHY2/IAA3 inhibits auxin-regulated gene expression.

Author information

1
Department of Biology, University of North Carolina at Chapel Hill, North Carolina 27599-3280, USA.

Abstract

In Arabidopsis, SHY2 encodes IAA3, a member of the auxin-induced Aux/IAA family. Gain-of-function mutations in SHY2/IAA3 cause enlarged cotyledons, short hypocotyls, and altered auxin-regulated root development. Here we show that the gain-of-function mutation shy2-2 decreases both the induction and repression of auxin-regulated genes, suggesting that SHY2/IAA3 acts as a negative regulator in auxin signaling. shy2-2 affects auxin induction of many previously characterized primary response genes, implying that it might repress primary auxin responses. In addition, shy2-2 also affects expression of multiple auxin-nonresponsive genes. Light regulates expression of SHY2/IAA3, suggesting a possible link between light and auxin response pathways.

PMID:
11884676
PMCID:
PMC152914
DOI:
10.1105/tpc.010283
[Indexed for MEDLINE]
Free PMC Article

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