Abstract
The experiment was carried out in the Field of the college of Agriculture and Forestry , Mosul University during growing season of 2009/2010 , General and specific combining abilities were evaluated for estimating their effects and reciprocal effect , gene action and heritability in studied characters which are yield and its components within the method of a full- diallel crosses of four varieties of faba bean viz:-(1)French(aquadulce) , (2)Syrian , (3)Tuweithe and (4)Babylon and their F2 hybrids, using Randomized Complete Block Design (RCBD) with three replications , according(Griffing,1956) to first method and fixed model. The results showed that general and specific combining ability was significant for most the studied characters. The reciprocal effect was significant for all the studied characters except 100 seed weight , biological and seed yield. The results also showed that the components of GCA was higher than the SCA variance for no. of days to maturity and no. of seed per pod , it can be predicted for an additive gene action for this character. Broad sense heritability was high for all the studied characters except no. of days to flowering , while narrow sense heritability was higher for pod setting and no. of days to maturity which indicate additive gene action for these characters. Average degree of dominance was more than one higher for the all studied characters except no. of days to maturity and no. of seed per pod , indicating over dominance control for these characters.
