The bHLH-type transcription factor AtAIB positively regulates ABA response in Arabidopsis
The bHLH-type transcription factor AtAIB positively regulates ABA response in Arabidopsis
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bHLH型转录因子AtAIB正向调节拟南芥中的ABA反应
DOI：
10.1007/s11103-007-9230-3
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发表时间：
2007-11-01
影响因子：
5.1
通讯作者：
Li, Chuanyou
中科院分区：
文献类型：
--
作者：
Li, Hongmei;Sun, Jiaqiang;Li, Chuanyou
已知植物激素阿坝在调节植物对干旱胁迫的反应中起重要作用。在这里，我们报告说，核本地化的基本螺旋-环-螺旋（bHLH）型蛋白，AtAIB，积极调节阿坝的反应在拟南芥。阿坝和PEG对AtAIB的表达有短暂的诱导作用，但其转录本在不同器官中均有积累。我们提供的证据表明，AtAIB在酵母中具有转录激活活性。AtAIB表达的敲低导致对阿坝的敏感性降低，而该基因的过表达导致子叶绿化和幼苗根生长对阿坝的敏感性升高。此外，过表达AtAIB的土壤生长植物表现出增加的耐旱性。综上所述，这些结果表明，AtAIB功能作为一个转录激活剂参与调节阿坝信号在拟南芥中。
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.