Vol. 8, Special Issue 8, Part G (2024)

Abstract: The experimental material consisted of twelve parents and their 32F₁ hybrids through line x tester analysis. An experiment was carried out in randomized complete block design including three replications to asses combining abilities for seed yield and its attributing traits at Main Oilseeds Research Station, Junagadh Agricultural University, Junagadh (Gujarat) during kharif-2022. The estimates of σ²gca were higher than the corresponding σ²sca for days to maturity only, while in case of remaining characters viz., for days to 50% flowering, plant height (cm), number of branches per plant, height to first capsule, number of capsules per plant, length of capsule (cm), width of capsule (cm), number of seeds per capsules, number of capsules per leaf axil, test weight (g), oil content (%) and seed yield per plant (g), the magnitude of σ²sca was higher than σ²gca. This was also confirmed by baker’s ratio (ݜŽ²gsc/ݜŽ²sca) which was less than unity (<1) for all the traits (except days to maturity) indicated that non-additive gene action was more pronounced than that of additive gene action. The lines N 62-39 and AT 510 and tester AT 338 found to be good general combiner for seed yield per plant and some of its related traits. The perusal of SCA effects revealed that the five cross combinations viz., AT 522 x GT 3, AT 482 x AT 338, AT 377 x GT 1, IC 204528 X AT 338 and DC 4 X AT 338. The cross AT 522 x GT 3 manifested good specific combining ability for seed yield and some of its related traits. Cross combinations with high SCA effects for seed yield per plant were in combinations of good × poor, average × good, average × poor, average × average and vice versa general combiners.