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Resveratrol plays a crucial phytoalexin role in the grapevine and is beneficial to human health. However, the molecular mechanism of resveratrol accumulation in the enhancement of disease resistance is unclear. Here, we report that the transcription factor VqMYB154 from  Vitis quinquangularis  accession Danfeng-2 is strongly expressed under artificial inoculation with  Uncinula necator  and regulates resveratrol accumulation. Unlike its homolog,  VqMYB154  has a pathogen-induced promoter and responds to stimulation by  U. necator ,  Pseudomonas syringae , and other treatments. Yeast one-hybrid and GUS activity assays confirmed that VqMYB154 can activate the stilbene synthase genes  VqSTS9 ,  VqSTS32 , and  VqSTS42  by directly binding to their promoters. Overexpression of  VqMYB154  in grape leaves resulted in activation of the stilbene pathway, upregulation of  STS  genes, and accumulation of stilbenoids. In addition, heterologous overexpression of  VqMYB154  in  Arabidopsis  activated resistance-related genes and resulted in greater programmed cell death and accumulation of reactive oxygen species, which led to resistance against  P. syringae . These results suggest that the transcription factor VqMYB154 from  V. quinquangularis  accession Danfeng-2 participates in the regulatory mechanism that improves the biosynthesis and accumulation of stilbenes and enhances resistance to disease in grapevine.

VqMYB154 promotes polygene expression and enhances resistance to pathogens in Chinese wild grapevine