南方农业学报2012，Vol.43Issue(6)：771-775,5.DOI:10.3969/j:issn.2095-1191.2012.06.771
广西稻瘟病菌生理分化及对4个水稻品种的毒性测定
Physiological differentiation of rice blast fungus and their toxicity to four rice cultivars
摘要
Abstract
[Objective]The aim of this experiment was to study physiological differentiation, avirulence gene types and occurrence frequency of different rice cultivars so as to provide relevant data for appropriate layout of rice cultivars and continuing control of rice blast. [ Method ]Seven Chinese differentiation types of rice blast and four single-gene rice varieties were used to determine physiological differentiation and pathogenicity of 104 rice blast strains obtained from five counties (cities) in Guangxi. [Result]The 104 tested single-spore strains were categorized into six groups (ZA, ZB, ZC, ZD, ZE, ZG) and 24 physiological race types, among which dominant group was ZB and dominant physiological race types were 1, 9 and 15 from ZB. The toxicity frequency of 104 rice blast strains in four-single rice cultivars was 89.42, 55.77, 82.69 and 72.12%, respectively, which avirulence gene frequency was 10.58, 44.23, 17.31 and 27.88%, accordingly. The rice blast strains from Quanzhou, Luzhai, Pingguo and Guiping basically had the same avirulence gene type to resistant gene including Pi-a, Pi-ta, Pi-b and Pi-k. Avirulence gene frequency trivially varied among various locations. [ Conclusion ] Resistance of rice cultivars was generally deprived of complex groups and numerous physiological race types of rice blast in field. The avirulence gene frequency was slightly different among different rice blast strains in different areas of Guangxi. Rice varieties contained with Pi-b were more applicable because they were more resistant to rice blast than those with Pi-ta.,Pi-a and Pi-k.关键词
稻瘟病菌/生理小种/抗病基因/无毒基因/广西Key words
rice blast fungus/ physiological race/ disease resistant gene/ avirulence gene/ Guangxi分类
农业科技引用本文复制引用
霍秀娟,李朝生,陆荣生,韩美丽..广西稻瘟病菌生理分化及对4个水稻品种的毒性测定[J].南方农业学报,2012,43(6):771-775,5.基金项目
广西青年科学基金项目(桂科青0832021) （桂科青0832021）
