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SnRK1 Phosphorylates and Destabilizes WRKY3 to Enhance Barley Immunity to Powdery Mildew

Plant Communications 2020年第4期1卷 115-128页

作者： Xinyun Han Ling Zhang Lifang Zhao Pengya Xue Ting Qi Chunlei Zhang Hongbo Yuan Lixun Zhou Daowen Wang jinlong qiuand Qian-Hua Shen State Key Laboratory of Plant Cell and Chromosome Engineering Institute of Genetics and Developmental BiologyChinese Academy of SciencesInnovation Academy for Seed DesignBeijing 100101China CAS Center for Excellence in Biotic Interactions University of Chinese Academy of SciencesBeijing 100049China State Key Laboratory of Plant Genomics Institute of MicrobiologyChinese Academy of SciencesBeijing 100101China

Plants recognize pathogens and activate immune responses,which usually involve massive transcriptional *** evolutionarily conserved kinase,Sucrose non-fermenting-related kinase 1(SnRK1),functions as a metabolic regulator that is essential for plant growth and stress ***,we identify barley SnRK1 and a WRKY3 transcription factor by screening a cDNA ***1 interacts with WRKY3 in yeast,as confirmed by pull-down and luciferase complementation assays.Förster resonance energy transfer combined with noninvasive fluorescence lifetime imaging analysis indicates that the interaction occurs in the barley *** expression and virus-induced gene silencing analyses indicate that WRKY3 acts as a repressor of disease resistance to the Bgh *** plants overexpressing WRKY3 have enhanced fungal microcolony formation and *** assays show that SnRK1 phosphorylates WRKY3 mainly at Ser83 and Ser112 to destabilize the repressor,and WRKY3 non-phosphorylation-null mutants at these two sites are more stable than the wild-type ***1-overexpressing barley plants display enhanced disease resistance to *** expression of SnRK1 reduces fungal haustorium formation in barley cells,which probably requires SnRK1 nuclear localization and kinase ***,these findings suggest that SnRK1 is directly involved in plant immunity through phosphorylation and destabilization of the WRKY3 repressor,revealing a new regulatory mechanism of immune derepression in plants.

关键词： SnRK1 phosphorylation WRKY transcription factor immunity powdery mildew fungus

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