论文部分内容阅读
本文根据1979～1990年四川省稻瘟病菌生理小种鉴定及研究结果,对稻瘟病菌致病性变化与水稻品种之间的关系进行了分析。结果表明,80年代以来,四川省稻瘟病生理小种组成发生了两次较大的变化。1983年后优势种群由ZG 群变为ZB 群,出现频率由1982年的零上升为1986年的72.17%,导致汕优2号完全丧失抗性;1989年后,ZA 群小种上升,出现频率由1984年的1.54%上升为1989年的25.00%,优势种群ZB 群下降,其频率由1986年的72.17%下降到1990年的47.85%,致使汕优63大面积发病。不同品种的稻瘟病菌各不相同。汕优2号以ZB、ZC 群为主的4群15个小种、汕优63有ZA、ZB、ZC 3群13个小种,其致病率均有差异。杂交稻的抗性主要来自恢复系,但更换不育系也可充分利用和发挥优良恢复系的特性。
In this paper, based on the identification and research results of the physiological races of Magnaporthe grisea from 1979 to 1990 in Sichuan Province, the relationship between the pathogenicity of Magnaporthe grisea and rice cultivars was analyzed. The results showed that two major changes occurred in the composition of rice blast physiological races in Sichuan since the 1980s. After 1983, the dominant population changed from ZG group to ZB group, and the frequency of occurrence increased from zero in 1982 to 72.17% in 1986, resulting in the complete loss of resistance of Shanyou 2. After 1989, the races of ZA group raises and the frequency of occurrence From 1.54% in 1984 to 25.00% in 1989, the ZB population of dominant species decreased. The frequency of ZB population decreased from 72.17% in 1986 to 47.85% in 1990, resulting in a large area of disease in Shanyou 63. Different varieties of Magnaporthe grisea vary. Shanyou 2 is dominated by ZB, ZC group of 4 groups of 15 races, Shanyou 63 has ZA, ZB, ZC 3 groups of 13 races, the incidence rates were different. The resistance of hybrid rice mainly comes from the restorer line, but the replacement of the sterile line can also make full use of and play the characteristics of an excellent restorer line.