Studies on hereditary character of grain weight for resistant BYDV materials in winter wheat

Study on heredity of three characters of grain weight per plant，per spike，and 1000-grain of the resistant BYDV materials in winter wheat are conducted using Griffing method I．The results show that the genetic of grain weight of three varieties is a additive-dominant genetic model，and the cytoplasm effect is smaller on 1000-grain weight，and in the grain weights per plant and spike，an obvious nucleus-cytoplasm interact exists．In the three resistant BYDV materials，the specific combining ability of“Linkang 1”is the biggest and its general combining ability is higher and its intercombinations have the marked differences．Therefore．“Linkang 1”is a good parent with its resistant BYDV and fertiIity and has a bigger useful value．