Abstract
Thirty six (36) genotypes (eight parents and 28 F1 diallel crosses) were grown in randomized complete block design with two replicates during 2006 at Mandura, North western Ethiopia. The experiment was executed to study the inheritance of two primary yield component traits: number of seeds per pod and 1000 seed weight. Statistical significant difference was observed between genotypes, parents and crosses for the traits considered. The mean square due to general combining ability was significant for the two traits. However, specific combining ability mean square was significant only for number of seeds per pod. Thus, both additive and non-additive types of gene actions were important in the inheritance of number of seeds per pod. Significant b1 component was obtained for number of seeds per pod. The b2 and b3 components however, were insignificant, suggesting the absence of gene asymmetry. From Wr/Vr graph, inheritance of seeds per pod was governed by partial dominance with additive gene action. Key words: Diallel crosses, general combining ability, Phaseolus vulgaris L., specific combining ability.
Highlights
A common bean is rich in protein (20 to 28%), especially the amino acids lysine and tryptophan, and is an important source of minerals such as iron and zinc (MOARD, 2006; Ribeiro et al, 2007)
The mean square due to General Combining Ability (GCA) was significant for the traits considered: number of seeds per pod and 1000seed weight
specific combining ability (SCA) mean square was significant only for number of seeds per pod. Both additive and non-additive types of gene actions were important in the inheritance of number of seeds per pod; additive gene action was more important as the variance component due to GCA was greater than that due to SCA. This result agrees with Islam et al (2006), Hinkossa et al (2013) in common bean and Idahosa and Alika (2013) in cowpea, but partially contradicts with Cruz et al (2004) and Vidigal et al (2008) where both found significant GCA and SCA mean squares with preponderance of SCA component in their genetic studies of common beans
Summary
A common bean is rich in protein (20 to 28%), especially the amino acids lysine and tryptophan, and is an important source of minerals such as iron and zinc (MOARD, 2006; Ribeiro et al, 2007). Supplements the cereal-based diet in many parts of the world. It is an important food crop in eastern and southern Africa, and recognised as the second most important source of human dietary protein and the third most important source of calorie of all the agricultural commodities produced in eastern and southern Africa (Kimani, 1999). In Ethiopia, common bean is one of the most important cash crops and source of protein for farmers. Common bean ranks third as an export commodity in Ethiopia, contributing about 9.5% of total export value from agriculture
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