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The cuticle of land plants is the first physical barrier to protect their aerial parts from biotic and abiotic stresses. DEWAX, an AP2/ERF-type transcription factor, negatively regulates cuticular wax biosynthesis. In this study, we investigated the resistance to  Botrytis cinerea  in  Arabidopsis thaliana  and  Camelina sativa  overexpressing  DEWAX  and in  Arabidopsis dewax  mutant. Compared to wild type (WT) leaves,  Arabidopsis DEWAX  OX and  dewax  leaves were more and less permeable to toluidine blue dye, respectively. The ROS levels increased in  DEWAX  OX leaves, but decreased in  dewax  relative to WT leaves. Compared to WT,  DEWAX  OX was more resistant, while  dewax  was more sensitive to  B. cinerea ; however, defense responses to  Pseudomonas syringae  pv. tomato DC3000:GFP were inversely modulated. Microarray and RT-PCR analyses indicated that the expression of defense-related genes was upregulated in  DEWAX  OX, but downregulated in  dewax  relative to WT. Transactivation assay showed that DEWAX upregulated the expression of  PDF1.2a, IGMT1 , and  PRX37 . Chromatin immunoprecipitation assay revealed that DEWAX directly interacts with the GCC-box motifs of PDF1.2a promoter. In addition, ectopic expression of  DEWAX  increased the tolerance to  B. cinerea  in  C. sativa.  Taken together, we suggest that increased ROS accumulation and  DEWAX -mediated upregulation of defense-related genes are closely associated with enhanced resistance to  B. cinerea  in  Arabidopsis  and  C. sativa .

DEWAX Transcription Factor Is Involved in Resistance to Botrytis cinerea in Arabidopsis thaliana and Camelina sativa