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

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Molecular Plant 2020年第9期13卷 1284-1297页

作者： Zhijuan Wang Ziyin Ren Chunhong Cheng Tao Wang Hongtao Ji Yang Zhao Zhiping Deng Liya Zhi Jingjing Lu Xinying Wu Shimin Xu Mengmeng Cao Hongtao Zhao Liu Liu Jiankang Zhu Xia Li National Key Laboratory of Crop Genetic Improvement College of Plant Science and TechnologyHuazhong Agricultural UniversityWuhanHubei 430070P.R.China Center of Agricultural Resources Research Institute of Genetics and Developmental BiologyChinese Academy of SciencesShijiazhuangHebei 050021P.R.China University of Chinese Academy of Sciences Beijing 100049P.R.China Shanghai Center for Plant Stress Biology Chinese Academy of SciencesShanghai Institutes for Biological SciencesShanghai 200032P.R.China Department of Horticulture and Landscape Architecture Purdue UniversityWest LafayetteIN 47907USA State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-products Institute of Virology and BiotechnologyZhejiang Academy of Agricultural SciencesHangzhouZhejiang 3210021P.R.China College of Life Science and Technology Yangtze Normal UniversityChongqingP.R.China Key Laboratory of Mental Health Institute of PsychologyChinese Academy of SciencesBeijingP.R.China College of Life Sciences in Hebei Normal University ShijiazhuangHebei 050024P.R.China

Seed germination and seedling establishment are important for the reproductive success of plants,but seeds and seedlings typically encounter constantly changing environmental *** 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 ***,little is known about how the aba-mediated inhibition of seed germination and seedling establishment is ***,we report that aba Signaling Terminator(ABT),a WD40 protein,efficiently switches off aba signaling and is critical for seed germination and seedling *** is induced by aba in a pyr1/pyl/rcar-pp2C-dependent *** of ABT promotes seed germination and seedling greening in the presence of aba,whereas knockout of ABT has the opposite *** 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 *** together,our results reveal a core mechanism of aba signaling termination that is critical for seed germination and seedling establishment in Arabidopsis.

关键词： aba ABT aba signaling pyr1/pyl7rcar-aba-pp2cs complex seed germination post-germinative development

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