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

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; in revised form: 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

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MDPI and ACS Style

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.

AMA Style

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. International Journal of Molecular Sciences. 2013; 14(7):13645-13656.

Chicago/Turabian Style

Song, Yaling; Xu, Zeng-Fu. 2013. "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. 14, no. 7: 13645-13656.

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