宁夏稻瘟病菌群体分布及小种的毒力测定

Distribution of Magnapor the Grisea Populations and Virulence Frequency of Races in Ningxia

2003-2006年对宁夏稻瘟病菌群体分布及优势小种的毒力研究,分别采用了3套鉴别品种,即用7个中国统一的鉴别品种、12个日本清泽鉴别品种、33个菲律宾国际水稻所已知单基因系,分析近几年宁夏生理小种的种类和优势小种。经测定宁夏有3群9个中国小种,ZA1,ZC17,ZC7小种为优势小种;根据稻瘟病菌与日本12个已知抗病基因品种互作亲和性的结果,区分为18个毒性类型,其中637小种出现频率最高,分布广且毒力频率高,成为宁夏的优势小种。该小种的毒力谱很广,能侵染除Pi-z,Pi-ta,Pi-b基因外的大多数已知抗性基因,中国小种ZC17及637小种是目前宁夏水稻生产上值得密切关注的小种之一。

We have researched distribution of rice blast group and virulence in Ningxia during 2003 - 2006. The isolates could be classified into three groups, nine races when they assessed with three sets of identify rice cultivars 7 Chinese differential rice cultivars, 12 Japanese cultivars with known resistance genes,33 Feilubin internation rice research cultivars with known resistance genes. ZA1, ZC17, ZC7 were predominant isolates. Result of rice blast to 12 Japanese cultivars with known resistance genes showed that 18 pathotypes were founded 637 pathological race was predominant with more discoveried frequency, wide distribution and high virulence frequency. 637 pathological race cound virulent most known resistance genes expert Pi-z, P. i-ta, Pi-b genes.ZC17,637 were high concerned in rice production.