In order to understand the validity of the resistant genes to wheat powdery mildew in Shanxi province, in greenhouse condition, cleistothecia released ascospores were used to infect wheat seedling. The frequencies of virulence genes for 166 isolates of Erysiphe graminis f . sp. tritici from different ecological areas of Shanxi province were tested. The results showed that virulence frequency of V4a、V4b、V13、V20、V21、VXBD、V2+6、V4+8、V2+Mli、V4b+Mli、V5+6、V1+2+9 were 3.6%~29.7%, Pm4a,Pm4b,Pm13,Pm20,Pm21,PmXBD,Pm2+6,Pm4+8,Pm2+Mli,Pm4b+Mli,Pm5+6, Pm1+2+9 were effective resistant genes to Erysiphe graminis f.sp. tritici and may be applicated as resistant parents; Virulence frequency of V1、V2、V3a、V3d、V3f、V6、V17、V19、V2+Ta were 38.6%~79.4%,The validity of Pm1、Pm2、Pm3a、Pm3d、Pm3f、Pm6、Pm17、Pm19、Pm2+Ta had decreased; Virulence frequency of V3b、V3c、V3e、V5、V7、V8 were 92.5%~98.7%, Pm3b、Pm3c、Pm3e、Pm5、Pm7、Pm8 had no applicable value in breeding if they were utilized as the only resistant sources. The difference of validity of wheat resistant genes in three wheat ecological areas of Shanxi province was anlyased. Suggestions were proposed for the application of resistant materials based on their validity and agronomic characters. |