黑龙江省不同来源稻瘟病菌致病性分析

Pathogenicity analysis of Magnaporthe oryzae isolates with various origins in Heilongjiang Province

将从黑龙江‘龙粳17’、‘吉特639’和‘垦稻10’病田中分离的9、8、8个稻瘟病菌菌株喷雾接种到4套鉴别寄主上,结果表明,中国稻瘟病菌生理小种鉴别寄主将这3个来源的菌株分别划分成8、7和4个生理小种,日本清泽鉴别品种则将其分别划分成9、8和8个生理小种,以黑龙江本地水稻品种作为鉴别品种,则可将其分别划分成8、7和5个致病型,以24个水稻抗稻瘟病单基因系为鉴别品种,则将上述菌株分别划分为9、7和8个致病型。

Conidial suspensions of 25 Magnaporthe oryzae isolates from three susceptible varieties, ‘Longjing 17’, ‘Jite 639’and ‘Kendao 10’, in Heilongjiang Province, were sprayed onto four sets of differential hosts to deter- mine their physiologic races and virulence types. 9, 8 and 8 isolates from these three varieties were differentiated into 8, 7 and 4 physiologic races by China differential hosts, respectively, while 9, 8 and 8 races by Japanese dif- ferential hosts. Using the local varieties as differential hosts, the isolates with different origins were divided into 8, 7 and 5 pathotype, respectively. 24 rice lines carrying single resistance genes, however, differentiated these i- solates into 9, 7 and 8 pathotypes, respectively.