Abstract— In the present investigation combining ability analysis and nature of gene action was studied for twenty lines, four testers and eighty hybrids, which were obtained from Line x tester biparental crossing scheme. The twelve characters were studied for winter maize under this experiment. Parental variance, Line variance, and line x tester variance revealed that there were significant differences in all the characters, whereas only tester variance showed three non-significant characters, namely days to 50% anthesis, days to maturity and cob length. The nature and magnitude of gene action showed that the dominance variance major reason towards hybrid performance for all characters. This means that non-additive action is important for the hybrid performance. The most promising crosses for higher yield per ha were L8 x T1 (27.63), L9 x T4 (23.44), L3 X T3 (23.41), L16 x T2 (23.03), L3 x T3 (22.81), L1 x T3 (22.51), L20 x T2 (19.48), L13 x T4 (19.47), L7 x T1 (18.22) and L17 x T4 (17.58) which have shown high SCA effects for grain yield which high parental GCA effects can be exploited for the development of SCHs because of non-additive gene action.
Keywords— Combining ability, GCA, Gene action, Maize and SCA.
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