Abstract:

Collections of Puccinia triticina were obtained from rust-infected wheat leaves throughout ShanXi、HuBei and SiChuan provinces of China in 2007. Single uredinial isolates were derived from the collections and tested for virulence phenotype on 40 differential hosts. The most common phenotype was THTT in Sichuan province and its frequency was 11.1%; were the main pathotypes in Hubei province and the frequency of the five pathotypes THQT，THQS，THQR，THQN and PHSP were 61.8%; PHST and FHST were the main virulence phenotypes in Shanxi province and the frequency of the two pathotypes were 17.1%. The result of virulence frequency analysis indicated that the virulence frequency of V9, V19, V24, V38, V39, V40, V41, V42, V43 and V45 were lower than 21% in the three provinces, and the virulence frequency of V9, V24, V38 were 0, which suggested the corresponding resistance genes are effective resistance genes in wheat breeding. But the virulence frequency of V2c, V3, V3bg, V11, VB, V14a, V14b, V16, V25, V26 and V33 were above 70%, which suggested the corresponding resistance genes lost their resistance to the pathogen in the three provinces. The virulence frequency of V1、V2a、V15、V19、V28 and V30 showed obvious difference in three provinces.