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Counteraction of ABA-Mediated Inhibition of Seed Germination and Seedling Establishment by ABA Signaling Terminator in Arabidopsis

文献类型： 外文期刊

作者： Wang, Zhijuan 1 ; Ren, Ziyin 1 ; Cheng, Chunhong 2 ; Wang, Tao 2 ; Ji, Hongtao 1 ; Zhao, Yang 4 ; Deng, Zhiping 6 ; Zhi, 1 ;

作者机构： 1.Huazhong Agr Univ, Coll Plant Sci & Technol, Natl Key Lab Crop Genet Improvement, Wuhan 430070, Hubei, Peoples R China

2.Chinese Acad Sci, Ctr Agr Resources Res, Inst Genet & Dev Biol, Shijiazhuang 050021, Hebei, Peoples R China

3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China

4.Chinese Acad Sci, Shanghai Ctr Plant Stress Biol, Shanghai Inst Biol Sci, Shanghai 200032, Peoples R China

5.Purdue Univ, Dept Hort & Landscape Architecture, W Lafayette, IN 47907 USA

6.Zhejiang Acad Agr Sci, Inst Virol & Biotechnol, State Key Lab Managing Biot & Chem Threats Qual &, Hangzhou 3210021, Zhejiang, Peoples R China

7.Yangtze Normal Univ, Coll Life Sci & Technol, Chongqing, Peoples R China

8.Chinese Acad Sci, Inst Psychol, Key Lab Mental Hlth, Beijing, Peoples R China

9.Hebei Normal Univ, Coll Life Sci, Shijiazhuang 050024, Hebei, Peoples R China

关键词： ABA; ABT; ABA signaling; PYR1/PYL/RCAR-ABA-PP2Cs complex; seed germination; post-germinative development

期刊名称：MOLECULAR PLANT （ 影响因子：13.164； 五年影响因子：16.357 ）

ISSN： 1674-2052

年卷期： 2020 年 13 卷 9 期

页码：

收录情况： SCI

摘要： Seed germination and seedling establishment are important for the reproductive success of plants, but seeds and seedlings typically encounter constantly changing environmental conditions. By inhibiting seed germination and post-germinative growth through the PYR1/PYL/RCAR ABA receptors and PP2C co-receptors, the phytohormone abscisic acid (ABA) prevents premature germination and seedling growth under unfavorable conditions. However, little is known about how the ABA-mediated inhibition of seed germination and seedling establishment is thwarted. Here, we report that ABA Signaling Terminator (ABT), a WD40 protein, efficiently switches off ABA signaling and is critical for seed germination and seedling establishment. ABT is induced by ABA in a PYR1/PYL/RCAR-PP2C-dependent manner. Overexpression of ABT promotes seed germination and seedling greening in the presence of ABA, whereas knockout of ABT has the opposite effect. We found that ABT interacts with the PYR1/PYL/RCAR and PP2C proteins, interferes with the interaction between PYR1/PYL4 and ABI1/ABI2, and hampers the inhibition of ABI1/ABI2 by ABA-bound PYR1/PYL4, thereby terminating ABA signaling. Taken together, our results reveal a core mechanism of ABA signaling termination that is critical for seed germination and seedling establishment in Arabidopsis.

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