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从水稻稻瘟病菌的1变异株(小种337)中取2个菌株供试,这个初瘟病菌具有广泛的病原致病谱,同时具有能分离出致病性变异菌株的性质。在各具有3种真性抗性基因的6个品种水稻叶片上,到第九代连续进行继代接种,根据这些,着手研究关于变异菌株的出现以及优势小种的变化。把供试的2个菌株,分别在6个品种的水稻上,在室外进行继代接种,接种后的12个组合中有4个组合在第九代前优势小种发生变化,特别对于具有真性抗性基因Pi-a的爱知旭和藤实这2个品种,在4个组合中的3个组合里,所
Two strains were selected from 1 mutant (race 337) of Magnaporthe grisea, which has a wide range of pathogenicity profiles and has the property of isolating pathogenicity mutants. From the 6 varieties of rice leaves each having 3 true resistance genes, successive generations were inoculated to the ninth generation. Based on these, studies were made on the occurrence of the mutant strains and the changes of the dominant races. The two tested strains were inoculated on 6 varieties of rice in the outdoors respectively. Four of the 12 combinations after inoculation changed in the 9th generation pre-dominant race, especially for those with true Aichi Asakawa and Fujisaki, the two genes of the Pi-a resistance gene, were found in 3 combinations of 4 combinations