湖北省稻瘟病重发区病菌群体致病性分化的研究  

Population Pathotype of Magnaporthe oryzae in Rice Blast Epidemic Areas of Hubei Province

作　　者：杨小林[1] 施仕胜 张舒[1] 吕亮[1] 喻大昭[1] 

机构地区：[1]湖北省农业科学院植保土肥研究所/湖北省农作物重大病虫草害可持续控制重点实验室,武汉430064 [2]咸宁市农业科学院,湖北咸宁421200

出　　处：《湖北农业科学》2016年第16期4169-4171,4175,共4页Hubei Agricultural Sciences

基　　金：国家科技支撑计划项目(2012BAD19B03);湖北省农业科技创新中心项目;湖北省自然科学基金项目(2015CFB673);湖北省农业科学院竞争性计划项目(2016jzxjh010)

摘　　要：基于中国鉴别品种和单基因品系,对湖北省稻瘟病(Magnaporthe oryzae)重发区病菌群体的毒性结构进行了分析。结果表明,湖北省稻瘟病菌群体具有较丰富的毒性类型。根据对中国鉴别品种的致病性反应,2006-2010年的单孢菌株可分成7群53个生理小种;根据对单基因品系的致病性反应,2009-2010年的菌株可分成72个致病类型。不同年份的稻瘟病菌群体在致病型组成上有差异,但在优势致病类型上没有明显的不同。湖北省稻瘟病重发区稻瘟菌群体对抗性基因Pi-kh的毒性频率较低,表明Pi-kh基因在湖北省水稻稻作区有很好的利用价值。Single spore isolates in the rice growing fields in Hubei province where rice blast seriously occurs were pathotyped against two sets of host differentials：Chinese host differentials and monogenic lines. The result found that there was more diversity in the pathotype of the isolates in Hubei province. 7 race groups 53 physiological race were observed out of the isolates in 2006 ～2010 with Chinese host differentials,while 72 pathotypes with the monogenic lines were observed out of the same isolates in 2009～2010. There was obvious change of pathotype structure among different years but the prevalent pathotype hold the line in those years. The gene Pi-khhad low susceptible frequency while resisting the rice blast fungus in Hubei province. It showed that the blast resistant gene Pi-khcould be well explored in blast resistance breeding programs in Hubei province.

关 键 词：水稻 稻瘟病(Magnaporthe oryzae) 生理小种 

分 类 号：S432.44[农业科学—植物病理学]