Combining ability and heterosis estimates for some quantitative traits in peanut (Arachis hypogaea L.) [Philippines]
1984
Redona, E.D.
Heterosis was observed for certain characters but was often limited in amplitude. Fewer crosses exhibited superiority over the better parent performance than over the midparent performance. Hybrid vigor was mainly observed for height of main axis and was generally associated with genetic diversity. Both GCA [general combining ability] and SCA [specific combining ability] were significant for all traits. However, estimates of GCA were of greater magnitude than the SCA indicating that a large portion of the total genetic variance for each trait resulted from the action of genes with additive genetic effects. PI 2621 29 had the largest GCA effects for seed yield and pod yield per plant, weight for seed and height of main axis. UPL Pn-4 had the largest GCA effects for number of pods and number of seeds per plant. Large SCA effects were observed mostly in crosses between botanical varieties. Seed yield per plant was genetically correlated with pod yield per plant, number of seeds per plant, weight per pod and height of main axis. The use of conventional selection methods that take advantage of additive genetic variance in this population should improve all characters studied
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