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

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

Key Laboratory of Tropical Plant Resource and Sustainable Use, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Mengla 666303, Yunnan, China
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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). View Full-Text
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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