我国小麦秆锈菌的毒性分析

 用40个近等基因系(near-isogenic line)对我国小麦秆锈菌的毒性进行了测定。按照美国禾谷类锈病室(Cereal Rust Laboratory)规定的密码(Code)命名的系统,小种HKR是最普通的毒力组合;占全部70个标样、127份菌株的33.1%。第二个优势小种是RKR,占全部菌株的24.4%。没有发现对Sr9e,11、38,Gt和Tmp有毒力的菌株。对Sr13,22,24,26,29,30,37的毒力频率较低、均在10%以下。毒力频率值在90%以上者(接近90%)的有Sr6,7a、7b、8a、9a、9d、9f、9g、10、12、14、15、16、18、20、28、34、36、dp-2和H。我国小麦秆锈菌无论是毒力组合或毒力频率都与北美的有很大区别。

VIRULENCE OF PUCCINIA GRAMINIS F. SP. TRITICI IN CHINA IN 1987

Virulence of Puccinia graminis f.sp. tritici was studied by testing 40 near-isogenic lines for stem rust resistance. Race HKR(21C3)was the most common virulence combination, making up 33.1% of the 127 isolates from 70 collections. The second most common race was RKR(34C2),which made up 24.4% of the isolates. No virulence was found on wheat lines with genes Sr9e, 11,38, Tmp and Gt.Virulence frequency to Srl3, 22,24,27,29, 30, and 37 was low,all below 10%. Virulence frequency to Sr6, 7b,8a,9a, 9d, 9f, 9g, 10, 12, 14, 15, 16, 18, 20, 23, 28, 34, dp-2 and H was high, all above (or near) 90%. Both the virulence combination and virulence frequency of Puccinia graminis f. sp. tritici are different between China and North America.