Rice blast,caused by the fungal pathogen Magnaporthe grisea, is one of the most serious diseases in rice (Oryza sativa L.) in the world ,which significantly reduced rice yield(Ou,1985).The use of resistant cultivars have been realized the most economical and effective way to control this disease. However, the effective lifespan of many cultivars is last only a few years, due to the breakdown of the resistance in the face of high pathogenic variability of the fungus (Kiyosawa, 1982). Moreover, wi...
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