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应用我国7个鉴别品种,鉴定了1980～1981年由我省7个地区37个县(市)采集分离的387个有效单孢菌株,区分为7群29个小种,其中ZB群为优势小种群,ZB_(15)为优势小种。 1975～1978年福建省稻瘟病菌生理小种区系组成相似,至1981年便发生了变化。但主要小种类型并无什么变化,而是小种组成比和地理分布范围的变更。其特点是侵染我省大面积栽培的珍尢系统品种的ZB群小种迅速增加,地理分布范围扩大。至1981年全省7个地区均以ZB群为优势小种群,ZB_(15)上升为优势小种,取代了过去致病力弱的优势小种ZG_1。文中还对稻瘟病菌的变异和稳定性作了讨论。关键词:稻瘟病菌;生理小种;中国鉴别品种;珍龙系统品种实践证明,利用抗病品种是防治稻瘟病的一项经济有效的措施,但品种抗性与稻瘟病菌的变异、小种区系组成的变化密切相关。因此,稻瘟病菌生理小种区系组成的变化及其消长规律的研究,是抗瘟育种品种布局和品种坑性变化预测的重要基础工作。在1973～1978年对我省稻瘟病菌生理小种研究的基础上,本文报导了1980～1981年福建稻瘟病菌生理小种的鉴定和1978、1981年小种区系组成的变化情况。
By using 7 differential cultivars in China, 387 effective monospores isolated and isolated from 37 counties (cities) in 7 regions of our province from 1980 to 1981 were identified, which were divided into 7 groups of 29 race breeds. Among them, ZB group was dominant Population, ZB_ (15) is the dominant race. From 1975 to 1978, the physiological races of Magnaporthe grisea in Fujian Province were similar in composition and changed in 1981. However, there is no change in the major races, but rather the racial and geographical distribution of races. It is characterized by the rapid growth of ZB swarm races that invade the large-scale cultivation of the Jane system in our province, and the geographical distribution has been expanded. By 1981, the ZB group was the dominant small population in all seven regions of the province, and the ZB_ (15) rose to the dominant race, replacing the dominant race ZG_1 with weak pathogenicity in the past. The article also discussed the variation and stability of Magnaporthe grisea. Key words: Magnaporthe grisea; Physiological race; Chinese differential breed; Zhenlong system Varieties Practice has proved that the use of resistant varieties is a cost-effective measure to prevent and control blast, but the variety resistance and Magnaporthe grisea variation are small The variation of species composition is closely related. Therefore, the study on the changes of the composition of the racecings of Physalospora pallidum and their growth and decline is an important basic work in the prediction of the variety and distribution of blast resistance breeding varieties. Based on the research on the physiological race of Magnaporthe grisea from 1973 to 1978 in our province, this paper reports the identification of the physiological race of Magnaporthe grisea from 1980 to 1981 and the changes of the flora in 1978 and 1981.