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WRKY57 Regulates JAZ Genes Transcriptionally to Compromise Botrytis cinerea Resistance in Arabidopsis 

 
论文编号:
作者: Jiang YJ
刊物名称: Plant Physiology
所属学科:
论文题目英文: WRKY57 Regulates JAZ Genes Transcriptionally to Compromise Botrytis cinerea Resistance in Arabidopsis
年: Jun 2016
卷: online
期:
页:
联系作者: Yu DQ
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影响因子: 6.280
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摘要: Although necrotrophic pathogens cause many devastating plant diseases, our understanding of the plant defense response to them is limited. Here, we found that  loss  of  function  of WRKY57  enhanced  the  resistance  of  Arabidopsis thaliana against Botrytis cinerea infection. Further investigation suggested that the  negative  regulation  of  WRKY57  against B.  cinerea  depends  on  the  JA signaling pathway. Chromatin immunoprecipitation experiments revealed that WRKY57  directly  binds  to  the  promoters  of JASMONATE  ZIM-DOMAIN  1(JAZ1) and JAZ5,  encoding  two  important  repressors  of  the  JA  signaling pathway,  and  activates  their  transcription.  In  vivo  and  in  vitro  experiments demonstrated that WRKY57 interacts with nuclear-encoded SIGMA FACTOR BINDING PROTEIN1 (SIB1) and SIB2. Further experiments display that the same  domain,  the  VQ  motif,  of  SIB1  and  SIB2  interact  with  WRKY3 and WRKY57.  Moreover,  transient  transcriptional  activity  assays  confirmed  that WRKY57 and WRKY33 competitively regulate JAZ1 and JAZ5, SIB1 and SIB2 further  enhance  these  competitions  of  WRKY57  to  WRKY33.  Therefore, coordinated  regulation  of Arabidopsis against B.  cinerea  by  transcription activators and repressors would benefit plants by allowing fine regulation of defense.
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