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利用我国7个统一鉴别品种鉴定2006~2008年从江西省31个水稻主产县(市)采集分离的195个稻瘟病菌有效单孢菌株,共鉴定到6群40个生理小种。所测菌株中ZB群出现频率最高,分布最广,为优势小种群。主要的优势小种为ZB13、ZB15、ZB5、ZA1,出现频率分别为14.36%、13.33%、6.67%、6.67%;3年中小种类群及优势小种的构成有一定的差异,在稻瘟病流行的2006年,小种类群以ZA和ZB为主,主要的优势小种为ZB13和ZA1,频率分别为17.65%和11.76%;在稻瘟病中发偏轻的2007年和2008年,小种类群及优势小种的构成均较为一致,2年中小种类群均以ZB为主,如2008年优势小种为ZB15和ZB13,频率分别为18.92%和10.81%;试验结果同时表明,同一穗瘟病标本中不同单孢菌株的生理小种不同,并讨论江西省稻瘟病菌生理小种的年度动态变化。
A total of 195 M. grisea isolates collected from 31 major rice-producing counties (or cities) in Jiangxi Province from 2006 to 2008 were identified using 7 uniform discriminating cultivars in China. A total of 40 physiological races were identified. The strains ZB appeared in the highest frequency, the most widely distributed, for the advantages of small populations. The main dominant races were ZB13, ZB15, ZB5 and ZA1, and their frequencies of occurrence were 14.36%, 13.33%, 6.67% and 6.67%, respectively. There was a certain difference in the composition of small and medium species and dominant races in three years. In 2006, ZA and ZB were dominant for small-sized species, ZB13 and ZA1 were the dominant species, with frequencies of 17.65% and 11.76%, respectively. In 2007 and 2008, the minor species ZB and ZB13, respectively, and the dominant races were ZB15 and ZB13, with frequencies of 18.92% and 10.81% respectively. The results also showed that the same panicle blast The physiological races of different monospora strains were different, and the annual dynamic changes of physiological races of Magnaporthe grisea were discussed.