The bHLH-type transcription factor AtAIB positively regulates ABA response in Arabidopsis

被引：0

作者：

Hongmei Li

Jiaqiang Sun

Yingxiu Xu

Hongling Jiang

Xiaoyan Wu

Chuanyou Li

机构：

[1] Chinese Academy of Sciences,State Key Laboratory of Plant Genomics and Center for Plant Gene Research, Institute of Genetics and Developmental Biology

[2] Graduate School of Chinese Academy of Sciences,undefined

来源：

Plant Molecular Biology | 2007年 / 65卷

关键词：

bHLH-type protein; AtAIB; ABA signaling; Drought tolerance;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

The phytohormone ABA was known to play a vital role in modulating plant responses to drought stress. Here, we report that a nuclear-localized basic helix-loop-helix (bHLH)-type protein, AtAIB, positively regulates ABA response in Arabidopsis. The expression of AtAIB was transitorily induced by ABA and PEG, although its transcripts were accumulated in various organs. We provided evidence showing that AtAIB has transcriptional activation activity in yeast. Knockdown of AtAIB expression caused reduced sensitivity to ABA, whereas overexpression of this gene led to elevated sensitivity to ABA in cotyledon greening and seedling root growth. Furthermore, soil-grown plants overexpressing AtAIB showed increased drought tolerance. Taken together, these results suggested that AtAIB functions as a transcription activator involved in the regulation of ABA signaling in Arabidopsis.

引用

页码：655 / 665

页数：10

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