INHERITANCE OF RESISTANCE TO FUSARIUM HEAD BLIGHT IN SPRING WHEAT F_1 HYBRIDS

摘要

Fusarium head blight, caused by Fusarium graminearum, has occasioned serious economic loss in spring cereals in the northcentral United States. As a result, resistance to FHB has become a high priority for spring wheat breeding. In replicated greenhouse experiments, we tested the FHB reactions of reciprocal F_1-hybrid wheats from seven crosses between four FHB-resistant parents and four susceptible adapted lines. Resistant parent lines were removed by one, two, or three breeding cycles from the Chinese line Sumai 3, the original resistance source. For each cross the FHB reaction of the F_1 was intermediate between the resistant and susceptible parents. The reciprocal F_1s did not differ from each other. In development of hybrid wheat requiring FHB resistance, both parents will likely have to carry resistance if Sumai 3 derived resistance sources are to be used.