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Cassava is a major food crop in tropical areas, but its productivity and quality are seriously limited by cassava bacterial blight. So far, the key factors regulating cassava immune response remain elusive. In this study, we identified three cassava Whirly genes ( MeWHYs ) in cassava variety of South China 124 (SC124), and explored the possible roles and utilization of  MeWHYs  in cassava disease resistance. Gene expression analysis revealed that the transcripts of three  MeWHYs  were commonly regulated by the highly conserved N-terminal epitope of f lagellin (flg22) and  Xanthomonas axonopodis  pv.  manihotis  Hainan ( Xam  HN) treatments. Overexpression of  MeWHYs  improved plant disease resistance against  X. axonopodis  pv.  manihotis , while  MeWHYs -silenced cassava plants by virus-induced gene silencing exhibited decreased disease resistance. Notably, MeWRKY75 physically interacted with three MeWHYs in yeast and in planta, and served as a transcriptional activator of  MeWHY3 . Moreover, the physical interaction between MeWHYs and MeWRKY75 promoted the transcriptional activities of each other. Consistently,  MeWRKY75  also positively regulated disease resistance against cassava bacterial blight. Taken together, our observations suggested that MeWRKY75 and MeWHYs confer improved disease resistance against cassava bacterial blight through forming an interacting complex of MeWRKY75–MeWHY1/2/3 and transcriptional module of MeWRKY75–MeWHY3. This study facilitates our understanding of the positive effect of the MeWRKY75–MeWHY3 transcriptional module in plant disease resistance.

Functional characterization of WHY–WRKY75 transcriptional module in plant response to cassava bacterial blight