SERINE/THREONINE PHOSPHATASE TAPP2Cs MIGHT BE SERVED AS AN EARLY SIGNAL MOLECULE FOR WATER STRESS IN WHEAT

文献类型： 外文期刊

第一作者： Song, K. H.

作者： Song, K. H.;Tian, W. L.;Hou, B. Z.;Guo, J. X.;Mei, X. R.;Li, Y. Z.

作者机构：

关键词： Wheat;Abscisic acid (ABA);Type 2C protein phosphatase (PP2Cs);Water loss;Gene expression

期刊名称：PAKISTAN JOURNAL OF BOTANY （ 影响因子：0.972； 五年影响因子：0.988 ）

ISSN： 0556-3321

年卷期： 2015 年 47 卷 5 期

页码：

收录情况： SCI

摘要： Much progress has been made towards understanding the role of serine/threonine phosphatases type 2C (PP2Cs) in abscisic acid (ABA) signaling transduction. However, how the negative regulator, PP2Cs, responds to plant water loss remains unclear. Here, we used a series of relative soil moisture [RSM: 85% (well watered), 65% (moderate stress), 45% (severe stress)] potted winter wheat (Triticum aestivum L.) and the detached leaves to detect ABA levels and transcripts of PP2Cs, including PP2C40, PP2C45, PP2C59 and PP2C6 as well as the core downstream signals of ABA, including ABF, SnRK2.4 and SnRK2.5. The results showed that the continual loss of water led to a consistent increase in ABA levels, and that the mRNA expression levels of PP2Cs were dependent on plant water condition. PP2Cs expression could be induced by a slight loss of water, and inhibited under severe loss of water. These results were further confirmed by the transcripts of ABF, SnRK2.4 and SnRK2.5. Furthermore, in slight loss of water, 100 mu M exogenous ABA could promote PP2Cs expression; in severe loss of water, it inhibited PP2Cs expression. In conclusion, ABA accumulation is controlled by water condition and the PP2C expression is dependent on plant water condition, suggesting that PP2Cs might be served as an early signal molecule for water stress in wheat.

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