Two transcription factors RhERF005/RhCCCH12 regulate rose resistance to Botrytis cinerea by modulating cytokinin levels.

Gray mold caused by the necrotrophic fungal pathogen Botrytis cinerea is one of the most destructive diseases in rose (Rosa spp.). Rose infection by B. cinerea leads to severe economic losses due to necrosis, tissue collapse, and rot. In rose, cytokinins (CK) positively regulate a defense response to B. cinerea, but little is known about the underlying molecular mechanisms. Here, we characterized two ethylene/jasmonic acid-regulated transcription factors, RhEFR005 and RhCCCH12, that bind to the promoter region of PATHOGENESIS-RELATED 10.1 (RhPR10.1) and promote its transcription, leading to decreased susceptibility to B. cinerea. RhEFR005/RhCCCH12-RhPR10.1 module induced cytokinin content in rose, and the susceptibility of RhEFR005-, RhCCCH12- and RhPR10.1-silenced rose petals can be rescued by exogenous CK. In summary, our results reveal that RhERF005/RhCCCH12-RhPR10.1 module regulates the CK-induced defense response of rose to B. cinerea.