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The necrotrophic fungus  Rhizoctonia cerealis  is a major pathogen of sharp eyespot that is a devastating disease of wheat ( Triticum aestivum ). Little is known about roles of MYB genes in wheat defense response to  R. cerealis . In this study,  TaRIM1 , a  R. cerealis -induced wheat MYB gene, was identified by transcriptome analysis, then cloned from resistant wheat CI12633, and its function and preliminary mechanism were studied. Sequence analysis showed that  TaRIM1  encodes a R2R3-MYB transcription factor with transcription-activation activity. The molecular-biological assays revealed that the TaRIM1 protein localizes to nuclear and can bind to five MYB-binding site  cis -elements. Functional dissection results showed that following  R. cerealis  inoculation,  TaRIM1  silencing impaired the resistance of wheat CI12633, whereas  TaRIM1  overexpression significantly increased resistance of transgenic wheat compared with susceptible recipient. TaRIM1 positively regulated the expression of five defense genes ( Defensin ,  PR10 ,  PR17c ,  nsLTP1 , and  chitinase1 ) possibly through binding to MYB-binding sites in their promoters. These results suggest that the R2R3-MYB transcription factor TaRIM1 positively regulates resistance response to  R. cerealis  infection through modulating the expression of a range of defense genes, and that  TaRIM1  is a candidate gene to improve sharp eyespot resistance in wheat.

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The wheat R2R3-MYB transcription factor TaRIM1 participates in resistance response against the pathogen Rhizoctonia cerealis infection through regulating defense genes