二面交雜에 의한 水稻 脫粒性의 遺傳分析

Diallel analysis of grain shattering in rice

The genetic of grain shattering in rice was studied in a 5 × 5 diallel cross set involving 5 rice varieties, three of which were non-shattering (Seomjinbyeo, Baegyangbyeo and Milyang 30) and the remaining two were easy-shattering(Milyang 23 and IR50). The effect of reciprocal combining was not clear in grain shattering of rice. Highly significant GCA (general combining ability) and SCA (specific combining ability) effects were observed on grain shattering in F₁ and F₂ generations while GCA effect was greater than SCA effect. Baegyangbyeo and Milyang 30 recorded high tendency of the non-shattering in GCA effects. Estimates of genetic parameters following Hayman’s method showed significant additive and non additive gene action, and the former appeared to be more larger than the latter. By Wr/Vr graphic analysis, grain shattering was incomplete dominance. Comparing with Seomjinbyeo, Baegyangbyeo, Milyang 30, IR 50 and Milyand 23 possesed more dominant alleles. Grain shattering suggested the involvement of both major and minor genes, and narrow sense heritability was high in F₁ and F₂ generation.