Abstract:

Wheat strip rust, caused by Puccinia striformis f.sp.tritici, is one of the most important diseases in China as well as in the world. It is becoming more and more severe, due to the overuse of water and fertilization as well as the change of agriculture cultivation system. Strip rust not only had the serious influence on wheat yield, but also seed biological character such as viability. In this study, susceptible cultivar ‘MY11’ was crossed with resistant wheat line ‘R212’ and ‘582-584’, respectively. Two F2:3 family lines, produced from above two cross combinations, which were used to investigate the biological character such as viability. The results indicated that the viability of seeds of susceptible plant was significant lower than that of resistant plants in the cross combination ‘MY11’/’R212’ while the difference was not obvious in ‘MY11’/‘582-584’. Comparing analysis suggested that wheat stripe rust would reduce the seed ability to grow and the degree of reduction would depend on the background of various genetic. This article affords primary evidences to further study of the degeneration of wheat resistance to stripe rust and wheat resistance breeding.