陕西省小麦白粉菌毒性结构及主栽小麦品种抗性基因的初步分析

为了解陕西省小麦白粉病菌毒性结构以及主栽小麦品种的抗白粉病基因状况,分别从关中和陕南地区的23个市、县采集白粉病标样,利用32个已知抗病基因品种(系)进行苗期毒力频率测定.同时在6个不同生态区对已知抗病基因品种的成株期抗病性进行了监测.结果表明,V1、V2、V3a、V3b、V3c、V3d、V3f、V5、V6、V8、V17、V2+Ta、V4+8、V1+2+19、V"Era"苗期毒力频率均在60%以上,成株期Pm3d、Pm5、Pm"Era"、Pm7、Pm21、Pm4+8在2个生态区表现感病.由此推断,陕西省优势毒性基因谱为V3d、V5、V"Era"、V4+8.已知抗白粉病基因Pm13、Pm2+Mld、Pm4b+Mli、Pm"XBD"成株期在不同生态区均表现抗病,且苗期毒力频率很低,应在小麦抗病育种中加以有效利用.陕西省主栽小麦品种抗病基因初步分析结果表明,武农148、远丰175、远丰139可能分别含有Pm8、Pm21、Pm17等抗病基因,其他6个品种抗病基因尚不明确.

Analysis on the Virulent Genes of Erysiphe graminis f.sp.tritici and the Resistance Genes of Wheat Commercial Cultivars in Shaanxi Province

To evaluate the virulent genes of Erysiphe graminis f.sp.tritici and the resistance of wheat cultivars in Shaanxi province,126 samples were collected from 23 cities(counties) in Guanzhong and Shannan region,then the virulent frequency were tested in seedling stage on 32 wheat cultivars with known resistant genes.Also,the resistance of these cultivars to powdery mildew were monitored at 6 sites in Shaanxi province.The results showed that V1,V2,V3a,V3b,V3c,V3d,V3f,V5,V6,V8,V17,V2+Ta,V4+8,V1+2+19 and V"Era" ha...