Combining ability analysis for seed yield and its components over environments in Indian mustard (Brassica juncea L.)

Abstract

Combining ability was analyzed using a Line x tester of ten lines and five testers in Indian mustard [Brassica
juncea (L.) Czern & Coss]. Combining ability analysis, on pooled basis, revealed the importance of both
additive as well as non-additive genetic variances for control of various traits. However, the ratio of 2gca/
2sca revealed the preponderance of non-additive gene action for all the traits except for days to maturity
where the additive gene action was predominant. The parents, GM 3, RSK 28 and SKM 0149 were the good
general combiners, whereas, hybrids RH 819 x RSK 28, NDR 8501 x NUDH YJ-3 and SKM 0149 x RSK 28
were found to be best specific combiners for seed yield per plant and some of the yield contributing traits.
However, on the basis of per se performance and significant sca effects for seed yield per plant and some of
it’s important components, hybrids RH 819 x RSK 28, SKM 0149 x RSK 28 and NDR 8501 x NUDH YJ-3
were considered to be most promising for further exploitation in breeding programmes.