Combining Ability Analysis for Grain Yield Stability in Hybrid Rice

Based on the data from incomplete diallel crossing at 4 different experiment sites, the combining ability for grain yield stability in hybrid rice and relationships between grain yield and its stability were analysed by AMMI model. There were interaction effects between sites and both grain yields of combinations and their combining ability of parents. The relationships between grain yields of combinations or combining ability of parents and its stability were not significant at 5 % or 1 % level. The grain yield stability in hybrid rice was controlled by general combining ability (GCA) and special combining ability (SCA) of parents, and GCA was more important than SCA.Breeding hybrid rice combination with high stability of grain yield needs at least one parent with higher GCA for stability.