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Members of the abscisic acid co-receptor PP2C protein family mediate salicylic acid-abscisic acid crosstalk

文献类型： 外文期刊

作者： Manohar, Murli 1 ; Wang, Dekai 1 ; Manosalva, Patricia M. 1 ; Choi, Hyong Woo 1 ; Kombrink, Erich 3 ; Klessig, Dani 1 ;

作者机构： 1.Cornell Univ, Boyce Thompson Inst, Ithaca, NY 14850 USA

2.Zhejiang Acad Agr Sci, Inst Crop & Nucl Technol Utilizat, Hangzhou, Zhejiang, Peoples R China

3.Max Plank Inst Plant Breeding Res, Chem Biol Lab, Cologne, Germany

4.Univ Calif Riverside, Dept Plant Pathol & Microbiol, Riverside, CA 92521 USA

关键词： ABA-SA crosstalk; abiotic stress; abscisic acid; biotic stress; salicylic acid; type 2C protein phosphatases

期刊名称：PLANT DIRECT （ 影响因子：3.038； 五年影响因子：3.017 ）

ISSN：

年卷期： 2017 年 1 卷 5 期

页码：

收录情况： SCI

摘要： The interplay between abscisic acid (ABA) and salicylic acid (SA) influences plant responses to various (a)biotic stresses; however, the underlying mechanism for this crosstalk is largely unknown. Here, we report that type 2C protein phosphatases (PP2Cs), some of which are negative regulators of ABA signaling, bind SA. SA binding suppressed the ABA-enhanced interaction between these PP2Cs and various ABA receptors belonging to the PYR/PYL/RCAR protein family. Additionally, SA suppressed ABA-enhanced degradation of PP2Cs and ABA-induced stabilization of SnRK2s. Supporting SA's role as a negative regulator of ABA signaling, exogenous SA suppressed ABA-induced gene expression, whereas the SA-deficient sid2-1 mutant displayed heightened PP2C degradation and hypersensitivity to ABA-induced suppression of seed germination. Together, these results suggest a new molecular mechanism through which SA antagonizes ABA signaling. A better understanding of the crosstalk between these hormones is important for improving the sustainability of agriculture in the face of climate change.

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