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

Abstract: Heterosis for seed yield and its components was studied in a set of line × tester crosses of eight lines and four testers. Analysis of variance revealed significant differences among the genotypes for all the characters, indicating the presence of sufficient variability in the experimental material for all the characters studied. Differences among parents were also found highly significant for all the characters. The differences among hybrids were also found significant for all the characters suggesting the presence of sufficient diversity among hybrid themselves for all the characters. While, differences among the parents vs hybrids were also found significant for seven characters viz., plant height, height to first capsule, number of capsules per leaf axil, width of capsule, number of seeds per capsule, number of capsules per plant, 1000-seed weight, oil content and seed yield par plant. Heterosis was worked out over better parent and standard check variety, GT-6. The standard heterosis for seed yield per plant ranged from -21.938 to 36.759%. The crosses AT 522 x GT 3, IC 204528 x AT 338 and N 62-39 x AT 338 were good heterotic combinations for seed yield per plant, which recorded 42.60, 33.06 and 17.96% standard heterosis, respectively. The heterosis for seed yield per plant was associated with the heterosis expressed by its component characters.