山东省部分稻瘟病菌生理小种分析

Physiological Race Analysis of Some Pyricularia oryzae Populations in Shandong Province

为明确山东稻区稻瘟病菌群体生理小种组成及分布,从山东6个代表性稻区收集的病样中分离到57株稻瘟病菌单孢菌株,并采用离体划伤叶片法接种至7个中国统一鉴别水稻品种。结果表明:57株菌可分为6个群33个生理小种。优势种群为ZA、ZC群,出现频率分别为42.11%、19.30%;其次是ZB、ZE群,出现频率分别为15.79%、12.28%,不含ZD群。优势生理小种为ZE3,出现频率为12.28%,其次是ZG1,出现频率为8.77%。此外,山东不同稻区的稻瘟病菌生理小种的类型及组成不同。本研究初步确定了山东省部分稻瘟病菌群体生理小种结构,为开展针对性抗瘟育种提供了重要科学依据。

To determine physiological races and population distribution of Pyricularia oryzae in Shandong Province,fifty-seven strains of rice blast were isolated from disease samples collected from six major rice growing regions and used to inoculate seven differential rice varieties by wounding detached leaves. The results showed that,the strains could be classified into six groups and thirty-three physiological races. ZA and ZC populations were the dominant ones, and the corresponding occurrence frequencies were 42. 11% and19. 30%,respectively. ZB and ZE populations were the next ones with the frequencies of 15. 79% and12. 28%,respectively. ZD population was not found. ZE3 was the predominant physiological race with a frequency of 12. 28%,followed by ZG1 as 8. 77%. In addition,the com;position and types of the rice blast physiological races in different rice growing regions of Shandong Province were quite different. The study determined the physiological races and their com;position of some P. oryzae populations in Shandong preliminarily,which could provide useful references for breeding resistant varieties to control rice blast.