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Int. J. Mol. Sci. 2013, 14(7), 13645-13656; doi:10.3390/ijms140713645
Article

Ectopic Overexpression of an AUXIN/INDOLE-3-ACETIC ACID (Aux/IAA) Gene OsIAA4 in Rice Induces Morphological Changes and Reduces Responsiveness to Auxin

*  and
Key Laboratory of Tropical Plant Resource and Sustainable Use, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Mengla 666303, Yunnan, China
* Author to whom correspondence should be addressed.
Received: 28 February 2013 / Revised: 16 June 2013 / Accepted: 17 June 2013 / Published: 28 June 2013
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Abstract

Auxin has pleiotropic effects on plant growth and development. AUXIN/INDOLE-3-ACETIC ACID (Aux/IAA) proteins are short-lived transcriptional regulators that mediate auxin responses through interaction with an auxin receptor, the F-box protein transport inhibitor response 1 (TIR1). Most functions of Aux/IAA proteins have been identified in Arabidopsis by studying the gain-of-function mutants in domain II. In this study, we isolated and identified an Aux/IAA protein gene from rice, OsIAA4, whose protein contains a dominant mutation-type domain II. OsIAA4 has very low expression in the entire life cycle of rice. OsIAA4-overexpressing rice plants show dwarfism, increased tiller angles, reduced gravity response, and are less sensitive to synthetic auxin 2,4-dichlorophenoxyacetic acid (2,4-D).
Keywords: Aux/IAA; 2,4-dichlorophenoxyacetic acid; gravity response; transgenic rice; tiller angle Aux/IAA; 2,4-dichlorophenoxyacetic acid; gravity response; transgenic rice; tiller angle
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Song, Y.; Xu, Z.-F. Ectopic Overexpression of an AUXIN/INDOLE-3-ACETIC ACID (Aux/IAA) Gene OsIAA4 in Rice Induces Morphological Changes and Reduces Responsiveness to Auxin. Int. J. Mol. Sci. 2013, 14, 13645-13656.

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