Heterosis and Genetic diversity in Crosses of Adapted Maize Composites.
1990
Benti Tolessa and Kebede Mulatu and Legese Wolde and Gezahegn Bogale
Twenty-eight F1s from a diallel cross involving eight composites of maize were evaluated at Boko and Didesa to determine the relative genetic affinity among the composites based on F, heterosis. A few F, hybrids gave higher grain yields than the better parental composites, but only at Bako, which was a better yield location than Didesa. Frequency of F1 hybrids having negative heterosis was much higher at Didesa. Mid-parent percentage of heterosis based on combined data from the two environments indicated that UCA and KCB were the most divergent composites. Alemaya Composite was found to be related to Awasa-Jima (_4), EAH-75, and Bako Composite II. Based on better parent heterosis, genetic divergence was interpreted to exist only between UCA and KCC. This indicates most of the composites included in the study lack distinct genetic difference.
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