Genetic Behavior manifestation of yield and its components in broad bean
2009
Farag, S.T.
The wide genetic variability available in evaluated material suggested scope for selection with regard to yield and its components in the cross Kobrosy X Luz De Otono. Results obtained showed that all studied characters were controlled by both additive and non-additive gene effects. Number of tillers per plant, number of pods per plant and seed index were significantly higher than the highest parent, suggesting over-dominance for the high parent. The over-dominance over the better parent was in evidence for the days to flowering and number of nodes to 1st pod. One to four pairs of genes are controlling total green pod yield. Significant heterosis and inbreeding depression were found for all traits. Broad sense heritability was high for all traits, except pod weight and total green-pod yield, since It was intermediate. It ranged from 60.98% for seed index to78.51% for days to flowering, indicating that selection can be used for improving these characters. There were considerable genotypic and phenotypic variability for plant height, number of tillers, first pod height number of pods per plant pod length, number of seeds per pod and 100-seed weight. It was found that 70 to 89 %of the phenotypic variances were due to genetic factors. Therefore, these traits might be more genotypicially predominant and it would he possible to achieve further improvement in them. These results are of great importance to breed high yielding and more stability broad bean cultivars under middle delta conditions.
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