论文部分内容阅读
由Blumeria graminis f.sp.tritici引起的小麦白粉病是危害甘肃省小麦安全生产的重要病害之一,分析病原菌毒性结构和抗病基因有效性对于指导白粉病的有效控制具有重要意义。2013年对甘肃省小麦白粉菌群体进行毒性分析结果表明,91个供试菌系中,对Pm1、Pm2、Pm3a、Pm3b、Pm3c、Pm3d、Pm3e、Pm3f、Pm4a、Pm4b、Pm5a、Pm6、Pm7、Pm8、Pm19、Pm33、Pm5+Pm6、Pm4+Pm8、Pm4b+Pm5b和PmEra的毒力频率达到70%以上,已无利用价值;对Pm13、Pm16、Pm21和Pm24的毒性频率在15%以下,尚可利用。选用甘肃省不同毒性谱的单孢堆菌系,对35个甘肃省及国内生产品种(系)进行苗期致病性测定,发现仅有‘绵麦37’具有优异抗病性。供试白粉菌系对‘定西40号’等22个品种(系)的毒性频率达到60%以上,甘肃省及中国生产品种中,苗期抗病品种(系)匮乏。
Powdery mildew caused by Blumeria graminis f. Sp. Tritici is one of the most important diseases that endanger the safe production of wheat in Gansu Province. Analyzing the pathogenicity of the virulence structures and the effectiveness of disease-resistance genes is of great significance for the effective control of powdery mildew. Toxicity analysis of wheat powdery mildew in Gansu province in 2013 showed that among 91 tested bacterial strains, Pm1, Pm2, Pm3a, Pm3b, Pm3c, Pm3d, Pm3e, Pm3f, Pm4a, Pm4b, Pm5a, Pm6, Pm7, The virulent frequencies of Pm8, Pm19, Pm33, Pm5 + Pm6, Pm4 + Pm8, Pm4b + Pm5b and PmEra reached more than 70%, and had no utilization value. The toxicity frequencies to Pm13, Pm16, Pm21 and Pm24 were below 15% available. The pathogenicity test of 35 cultivars (lines) of Gansu Province and its domestic production strains was carried out by using single-strain bacterial strain with different toxicity spectrum in Gansu Province. Only ’Mianmai 37’ had excellent disease resistance. The tested strains of powdery mildew had more than 60% toxicity to 22 varieties (strains) such as ’Dingxi No.40’, and lack of resistant varieties (lines) in seedling stage in Gansu Province and China.