Genetic variances and interrelationships of some agronomic traits in a Maize Composite (KCC)
1999
Legesse Wolde(Bako Research Center, Bako (Ethiopia). Maize breeds, National Maize Research Program) | Benti Tolessa(Bako Research Center, Bako (Ethiopia). Maize breeds, National Maize Research Program) | Dejene Mekonnen(Alemaya University of Agriculture, Dire Dawa (Ethiopia). Associate Professor)
A diallel cross involving eleven randomly selected maize inbred lines from Kitale Composite C (KCC) was evaluated in randomised complete block design at Arsi-Negele, Awassa and Bako in 1992. The objectives were to estimate the types and extent of gene actions and to study interrelationships of agronomically important characters in KCC. Data for seven plant and five ear traits including grain yield were recorded. Combining ability method II model II analyses of Griffing was used to estimate the various types of genetic parameters. Correlation coefficients between pairs of characters were determined. Combining ability analyses for most characters showed significant differences in general combining ability (GCA) and specific combining ability (SCA) effects. Estimates of additive genetic variances for 100 seed weight, kernel row per ear, number of leaves per plant, and percent stalk lodging were significantly larger than dominance variance. These traits in KCC can be improved through intra-population selection methods. Estimates of dominance genetic effects for yield, ear diameter and ear length were more important than additive effects. For plant height, ear placement, tasseling, silking and internode length, both types of gene actions were found important. Method of selection that can utilize both additive and dominance gene effects such as reciprocal recurrent selection can be applied to improve these traits.
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