Combining Ability, Heritability and Gene Action Assessment in Rapeseed (Brassica napus L.) for Yield and Yield Attributes
Muhammad Ali Shah, Faiz Ur Rehman, Abbas Mehmood, Fareed Ullah, Sayed Irfan Shah and Syed Majid Rasheed*
An F1 hybrid of Brassica napus L., derived from 5 × 5 diallel, was studied to estimate combining ability, heritability and gene action of morphological and yield associated traits, utilizing randomized complete block design (RCBD) with two replications, at Bacha Khan Agricultural Research Farm (BARF), Charsadda, Khyber Pakhtunkhwa, Pakistan during the growing season of 2017-18. The data were collected for pods related traits and total yield. The results of the study showed significant differences among parents and F1’s for all the studied traits. General and specific combining ability analysis revealed non-significant results for the traits under consideration, suggesting the involvement of non-additive type of gene action. A higher broad sense heritability estimate was evident. It was concluded from the combining ability analysis of the present study that genotype 2702 was best general as well as a specific combiner for pod length (PL), seeds pod-1 (SPP), total yield (TY), and 1000 seed weight (SW). In addition, maximum pod length, seeds pod-1, total yield, 1000 seed weight and pods plant-1(PPP) were observed for those F1 hybrids where genotype 2702 was used as seed setter, i.e. 2702 × P1-119 and 2702 × DUNCLED. Higher broad-sense heritability and non-additive type of genetic variability indicated that it could be integrated as a valuable tool in breeding strategies to choose genotypes of B. napus L. for high yielding traits.
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