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Sheath blight(SB),caused by necrotrophic fungus Rhizoctonia solani Kühn(R.Solani),is one of the most destructive diseases in rice worldwide.Increasing studies have showed that plant hormone cytokinins(CKs)play an important role in regulation of plant disease resistance.However,its role in enhancing rice resistance to SB remains unknown.Here,we found that exogenous application of synthetic CK kinetin(KT)reduced the severity of R.Solani-induced symptoms.