Wheat Landraces And Powdery Mildew Resistance And Resistance To Genetic Analysis

Resistance to powder mildew of 1995 native wheat varieties was identified in Jiangsu province. Only 7 varieties showed resistance. The native wheat varieties, Hongjuanmang, Mazhamai and Xiaobaidongmai, have been identified as highly 4 resistant materials to powdery mildew both at the seedling and adult stage under inoculated conditions over many years in Nanjing. The inheritance of resistance to powdery mildew in the three varieties was studied by crossing them with resistant varieties that had known Pm genes and susceptible variety respectively. The data in F1 and F2 generations showed that powdery mildew resistance of the three natives involved one dominant gene respectively and they were different from Pm2, Pm6 and Pm8. It was supposed that they were new gene(s) for resistance to powdery mildew originated from China. All the F Is between the three native varieties were resistant and F2s did not segregate at resistant level. This implied that they beared the same resistant gene locus. It is necessary to further study their relationships and exploit native resistant resources.