Genetic Analysis of Some Economic Traits in Diallel Yellow Maize (Zea mays L.) Crosses

Rim Ahmad Alabd Alhadi, Maha Lutfi Hadid, Samir Ali Al-Ahmad


A half diallel set of crosses among eight inbred lines of yellow maize was evaluated to study heterosis and combining ability among plant height, leaf angle, number of rows per ear, number of grains per row, shelling percentage and grain yield per plant. The study was carried out at the Maize Research Department, GCSAR, Damascus, Syria. Results showed that mean squares of inbred lines and hybrids were highly significant for all studied traits. For grain yield per plant, almost all crosses expressed a significant positive heterosis effect relative to the check variety (Al-bassel-1); whereas, five crosses showed positive heterosis values relative to the check variety (S-4-985). The ratio (σ2GCA/σ2SCA) showed that the non-additive gene action was more important than the additive gene action in all traits except leaf angle and shelling percentage. The inbred lines (IL.375- 06), (IL.275-06), (IL.362-06) and (IL.459-06) seemed to be the best general combiners for grain yield per plant. Also, many of the positive SCA effects were detected for all traits. Based on SCA effects, six new single crosses were identified as superior for grain yield, and the best hybrid was (IL.363-06 × IL.275-06).


Maize, Heterosis, Combining ability, Half diallel cross, Degree of dominance, Grain yield

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