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Necrotrophic pathogens are an agriculturally important group of destructive pathogens.One of them is Sclerotinia sclerotiorum, which attacks more than 400 plant species and is one of the most important diseases in oil crops in the world.S.sclerotiorum is also the major diseases of oilseed rape in China.But little is known about molecular mechanisms of host resistance to S.sclerotiorum, which thus limited development of resistance improvement strategy.We identified WRERF50 gene from cDNA microarray of B.napus inoculated with S.sclerotiorum.