华北农学报2012，Vol.27Issue(3)：227-230,4.
东北地区玉米大斑病菌生理分化研究
Identification of Physiological Races of Exserohilum turcicum in Northeastern China
摘要
Abstract
In order to understand the epidemic factors of northern corn leaf blight in northeastern China, the physiological differentiation and races dynamic of Exserohulum turcium was investigated. Using routine technique, eighty-eight isolates of Exserohulum turcium,collected from 22 areas of Liaoning, Jilin and Heilongjiang provinces in 2010,was identified on different resistant genes(Htl,Ht2,Ht3 and HtN). The results showed that 14 races were i-dentified among these fungal isolates,including 0 ,1 ,2 , N , 12 , IN ,23 ,2N ,3N , 12N , 123N , 123 ,23N and 13N. The physiological differentiation of E. turcicum in northeastern China was obvious. And the race infect the maize with all kinds of resistance genes was appeared. Among these races population, races 0 and 1 were predominant with occurrence frequency of 37. 5% and 20. 5% . The virulence frequencies against genes Htl ,Ht2 ,Ht3 and HtN was 45. 5% , 30. 7% ,15. 9% and 23. 7% respectively. The physiological race component and their inter-specific of E. turcicum variability in northeastern China became complex and new races were frequently found. The increasing epidemic of northern maize leaf blight in northeastern China was ascribed to the continuing occurrence of new races of the pathogen, the increasing virulence frequencies of such major races as 0 and 1 ,and the resistance losing of the cultivars.关键词
玉米大斑病菌/生理分化/鉴定/动态分析Key words
Exserohilum turcicum/ Physiological differentiation / Identification/ Dynamic analysis分类
农业科技引用本文复制引用
张秀霞,高增贵,周晓锟,张硕,周艳波..东北地区玉米大斑病菌生理分化研究[J].华北农学报,2012,27(3):227-230,4.基金项目
国家粮食丰产科技工程项目(2011BAD16B12) （2011BAD16B12）
现代农业产业技术体系专项(CARS-02):辽宁省教育厅重点实验室项目(LS2010149) （CARS-02）
