Investigations on faba beans, Vicia faba L.: 26- genetic analysis of earliness characters and yield components [electronic resource].

Includes references.

The present investigation was carried out under the Insect free cage at Giza Research Station during 2008/09 and 2009110 growing seasons. A diallel cross including reciprocals among five faha bean genotypes (Giza40, Giza 843, Nubaria 1, Triple White and ICARUS) was utilized 10 estimate different sources of genetic variability and other derived parameters for earliness, seed yield and Its components vis. pods, seeds and 100¬seed weigh. The analysis of variance for earliness showed highly slgnlj1cllnt differences among genotypes, pointing to a wide genetic variability for }lowering and maturity. The parental genotype Giza 843 had the earliest and tallest plants and exhibited significantly the highest seed yield/plant Nubaria 1 had significantly the highest lulmber of pods/plant and 100-seed weight All crosses had highly significant he~l'06is and heterobeltiosis for seed yield/plant except the three crosses: Nubarla 1 x ICARUS, ICARUS x Nubarla 1 and ICARUS x Triple White.. The ratio of GCA/SCA exceeded the unity except for days to flowering, days to maturity, branches/plant and 100-seed weigh Low GCAISCA ratios revealed the predominance of non-additive gene action in this case. Most of the genetic variation among the Investigated genotypes appear' to be additive. Thus, selection could be favored for improved these traits. The additive genetic variance (D) was highly significant for days to }lowering, pods/plant and 100-seedwelght Indicating that additive effect is important In the inheritance of these traits. . Therefore selection would be expected to be effective. The component of variation due to dominance effects (H J was highly significant for all traits Indicating the presence of dominance with asymmetrical gene distribution In the parental genotypes. All traits had high values of fH1 and Hz than "D" except days to flowering' and 100-seed weight (g) Indicating the important role of dominance genetic variance. Heritability estimates in broad sense were found to be high for all characters and ranged from 72% (days to maturity) to 98% (number of seeds/plant). Heritability in narrow sense was lower than in broad sense and ranged from 19% for seed yield/plant to 77% for days to-flowering. This is indicator for the importance of both additive and non-additive genetic variance in the Inheritance of these traits.

Summary in Arabic.

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