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Wheat powdery mildew (Pm), caused by Blumeria graminis f. sp. tritici ( Bgt ), is a prevalent fungal disease. The diploid wheat relative Haynaldia villosa ( H. villosa ) showed broad-spectrum resistance (BSR) to Pm. A previous study reported an E3 ligase gene, CMPG1-V from H. villosa , showing BSR to Pm. To elucidate the regulatory network mediated by CMPG1-V , in this study, gene expression profiling of CMPG1-V transgenic plant ( CMPG1-V  OE ) and its receptor Yangmai 158 was analyzed and compared after Bgt inoculation at four infection stages. GO and KEGG analysis revealed obvious reprogramming of SA and ABA signaling, starch/sucrose metabolism, and photosynthesis in CMPG1-V  OE , compared with those in Yangmai 158. Transcripts of SA synthesis genes SARD1 and UGT , signaling factors TGA and PRs , and SnRKs in ABA signaling were specifically upregulated in CMPG1-V  OE rather than Yangmai 158. Transcripts of LHCII in photosynthesis, GLUC and TPP in starch/sucrose metabolism were also induced distinctly in CMPG1-V  OE . WGCNA analysis showed crucial regulatory candidates of CMPG1-V , involving serine/threonine-protein kinase in phosphorylation, glucosyltransferase in flavonoid biosynthesis, defense factor WRKYs, and peroxidase in oxidative stress. Our results facilitate the deciphering of the resistant regulatory network of CMPG1-V and the identification of key candidates which might be employed in breeding programs.

The Regulatory Network of CMPG1-V in Wheat–Blumeria graminis f. sp. tritici Interaction Revealed by Temporal Profiling Using RNA-Seq