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为明确小麦白粉病抗性基因在山西省的有效性，在温室条件下，通过闭囊壳释放子囊孢子侵染麦苗发病，利用28个已知抗病基因品种（系）对分离自山西省不同生态区的166个小麦白粉病菌株进行了毒性基因频率测定。结果表明，毒性基因V4a、V4b、V13、V20、V21、VXBD、V2+6、V4+8、V2+Mli、V4b+Mli、V5+6、V1+2+9的出现频率为3.6%～29.7%，其对应抗性基因Pm4a、Pm4b、Pm13、Pm20、Pm21、PmXBD、Pm2+6、Pm4+8、Pm2+Mli、Pm4b+Mli、Pm5+6、Pm1+2+9为目前山西省小麦白粉病菌的有效抗病基因，可供转育利用；毒性基因V1、V2、V3a、V3d、V3f、V6、V17、V19、V2+Ta的出现频率为38.6%～79.4%，其对应抗性基因Pm1、Pm2、Pm3a、Pm3d、Pm3f、Pm6、Pm17、Pm19、Pm2+Ta的利用价值已下降；毒性基因V3b、V3c、V3e、V5、V7、V8的出现频率为92.5%～98.7%，其对应抗性基因Pm3b、Pm3c、Pm3e、Pm5、Pm7、Pm8单独使用无利用价值。对各抗性基因在山西省小麦三个生态区的有效性差异分析认为，各生态区应针对毒性基因的变化动态结合农艺性状选择选用合适的抗性基因进行转育。

英文摘要:

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.

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