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The Plant Cell, Vol. 14, 301-319, February 2002, Copyright © 2002,
American Society of Plant Biologists

Arabidopsis SHY2/IAA3 Inhibits Auxin-Regulated Gene Expression

Qing Tiana, Nicholas J. Uhlira and Jason W. Reed1,a,b

a Department of Biology, University of North Carolina at Chapel Hill, North Carolina 27599-3280
b Curriculum in Genetics and Molecular Biology, University of North Carolina at Chapel Hill, North Carolina 27599-3280

1 To whom correspondence should be addressed. E-mail jreed{at}email.unc.edu; fax 919-962-1625

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.




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