2004年陕西省小麦条锈菌生理小种监测结果

Physiological races of wheat stripe rust in Shaanxi Province in 2004

对2004年采自陕西省及甘肃省天水的287份小麦条锈病标样生理小种鉴定结果表明,出现频率居前4位的小种及致病类型是条中32号、水1、水6及水4,分别为33.44%、9.75%、9.40%、7.66%。与2002、2003年同期相比,条中31号频率逐年下降,水14频率略有下降,水7、水5频率有所上升,其他各小种(类型)频率相对较低。毒力频率分析表明,Yr9、Yr3 b.4 b、YrSu等抗性基因已经失效。

Two hundreds and eighty-seven samples collected from nineteen differential hosts in Shaanxi and Gansu provinces were identified in 2004. The results showed that CY32 was the most predominant race and its frequency was 33. 44%. Su11-1 and Su11-6 pathotypes were the secondly and thirdly dominant races and their occurrence frequencies were 9.75% and 9.40%, respectively. In contrast with that in 2002 and 2003, the frequencies of CY31 and Su14 declined, while the occurrence frequencies of Su7 and Su5 increased. The other races and pathotypes had low occurrence frequencies. The cultivars carrying genes Yr9, Yr3b. 4b and YrSu had become susceptible to the prevalent races of wheat stripe rust.