Combining Ability Analysis for Maturity and Plant Architecture Traits in Intra-Specific Crosses of Rapeseed (Brassica napus L.)
Combining Ability Analysis for Maturity and Plant Architecture Traits in Intra-Specific Crosses of Rapeseed (Brassica napus L.)
Muhammad Ishaq and Raziuddin
ABSTRACT
Combining ability was determined in an 8 × 8 diallel intra specific F1 crosses in rapeseed (Brassica napus L.) during 2011-2013 to scrutinized potential lines, hybrids, and nature of gene action involved in the inheritance of maturity and plant architecture traits. Analyzed data revealed highly significant differences among the genotypes for days to flowering, maturity, plant height, primary branches plant-1 and main raceme length. Analysis of combining ability revealed highly significant GCA (general combining ability), SCA (specific combining ability) and RCA (reciprocal combining ability) effects for the studied traits. Based on GCA, best general combiners were AUP-7 for earlier flowering and maturity, AUP-2 for plant height, AUP-14 for primary branches plant-1 and AUP-9 for main raceme length. Based on SCA effects, best F1 hybrids were AUP-7 × AUP-14 (days to flowering), AUP-8 × AUP-9 (days to maturity), AUP-17 × AUP-18 (plant height), AUP-14 × AUP-20 (primary branches plant-1) and AUP-14 × AUP-20 (main raceme length) and could be utilize in future rapeseed breeding programs. The estimates of variances of combining ability (σ2GCA, σ2SCA) and predictability ratio (σ2GCA/σ2SCA>1.00) indicated that gene action was predominantly additive for days to flowering while, for the rest of the traits non additive gene action was responsible as the predictability ratio was less than unity which was further confirmed by higher values of variances of SCA than GCA. In present study for all the traits except days to flowering, non-additive gene action was prominent therefore selection should be delayed to late segregation generation.
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