Combining ability analysis in Indian mustard [Brassica juncea (L.) Czern & Coss.] involving Ogura CMS system

Line × tester analysis was carried out to estimate combining ability of Ogura CMS based hybrids in Indian mustard [Brassica juncea (L.) Czern & Coss.]. For this, 50 hybrids were developed by crossing five Ogura CMS lines with ten restorers according to the Line x Tester mating design. A total of 65 genotypes including 50 hybrids and 15 parents were evaluated during Rabi, 2017–18. Analysis of variance revealed significant differences among lines and crosses for most of the traits. The value of σ²SCA/σ²GCA was found less than one, for most of the traits indicating a major role of non-additive gene action in the expression of characters. Line RH 0555-OA and tester IOR-12 were found to be good general combiners possessing highly significant and positive gca effects for seed yield and component traits. The cross RH 0630-OA × IOR-12 had expressed the highly significant and positive sca effects for seed yield per plant. Other crosses such as RH 8812-OA × IOR-3, RH 0749-OA × IOR-6, RH 0749-OA × IOR-22, RH 0749-OA × IOR-18 and RH 0630-OA × IOR-11 had exhibited significant sca effects for different yield related characters in Indian mustard.