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To estimate combining ability and heritability of F2 populations of 4 x 4   full diallel crosses and parents, an experiment was carried out at The   University of Agriculture, during 2012-2013. Four parental lines and F2   populations of six direct and six reciprocal crosses were planted in the   experiment using RCB design. Data were recorded on phenological and   vegetative growth traits: Days to flowering, plant height, main stem length,   main raceme length, primary branches, and days to maturity. Analysis of   variance revealed significant variation among genotypes for all the   parameters studied. The results of combining ability analysis showed that   general combining ability (GCA) was highly significant for primary branches   plant-1, significant for plant height and days to physiological maturity and   non-significant for the remaining traits. Specific combining ability (SCA)   and reciprocal effects (RE) were significant for plant height, days to   flowering, main raceme length and days to physiological maturity. Genotype   AUP-401 was best general combiner for main raceme length, primary branches   plant-1 and days to physiological maturity. Among the crosses, AUP-404 x   AUP-402 was best specific combiner for plant height, days to flowering and   main stem length. Broad sense heritability was high (>70%) for plant height,   main stem length and primary branches. Moderate heritability was observed for   main raceme length, days to 50% flowering and days to physiological maturity.   The variance components of SCA were greater than respective GCA components of   all the characters signifying the presence of non- additive genetic effects   in transfer of these traits and selection in the later generations should be   practiced for improvement of these traits

Heritability and combining ability of vegetative growth and phenological development of diallel crosses of rapeseed