首页|Phosphorylation of ZmAL14 by ZmSnRK2.2 regulates drought resistance through derepressing ZmROP8 expression
Phosphorylation of ZmAL14 by ZmSnRK2.2 regulates drought resistance through derepressing ZmROP8 expression
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Drought stress has negative effects on crop growth and production.Characterization of tran-scription factors that regulate the expression of drought-responsive genes is critical for under-standing the transcriptional regulatory networks in response to drought,which facilitates the im-provement of crop drought tolerance.Here,we identified an Alfin-like(AL)family gene ZmAL14 that negatively regulates drought resistance.Overexpression of ZmAL14 exhibits susceptibility to drought while mutation of ZmAL14 enhances drought resistance.An abscisic acid(ABA)-activated protein kinase ZmSnRK2.2 interacts and phosphorylates ZmAL14 at T38 residue.Knockout of ZmSnRK2.2 gene decreases drought resistance of maize.A dehydration-induced Rho-like small guanosine triphosphatase gene ZmROP8 is di-rectly targeted and repressed by ZmAL14.Phos-phorylation of ZmAL14 by ZmSnRK2.2 prevents its binding to the ZmROP8 promoter,thereby re-leasing the repression of ZmROP8 transcription.Overexpression of ZmROP8 stimulates perox-idase activity and reduces hydrogen peroxide accumulation after drought treatment.Collec-tively,our study indicates that ZmAL14 is a neg-ative regulator of drought resistance,which can be phosphorylated by ZmSnRK2.2 through the ABA signaling pathway,thus preventing its sup-pression on ZmROP8 transcription during drought stress response.
ZmAL14drought tolerancetranscription factormaize
Yalin Wang、Jinkui Cheng、Yazhen Guo、Zhen Li、Shuhua Yang、Yu Wang、Zhizhong Gong
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State Key Laboratory of Plant Environmental Resilience,Frontiers Science Center for Molecular Design Breeding,College of Biological Sciences,China Agricultural University,Beijing 100193,China
Center for Crop Functional Genomics and Molecular Breeding,China Agricultural University,Beijing 100193,China
College of Life Sciences,Institute of Life Science and Green Development,Hebei University,Baoding 071002,China
National Key Research and Development Program of ChinaST12030-Major Projects
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