Genetic improvement through standard heterosis for seed cotton yield in upland cotton [Gossypium hirsutum L.)

摘要

A study was conducted in Gossypium hirsutum cotton with line x taster (15 x 4) to estimate the magnitude of heterosis among different cross combinations for yield and its component traits. For this purpose, 60 specific cross combinations were developed by using 19 diverse parents during kharif, 2014. These hybrids along with 19 parents and standard check HHH 223 were planted during kharif, 2015 at CCS Haryana Agricultural University, Hisar. The analysis of variance indicated the presence of variability among hybrids and their parents. Heterosis studies revealed that the maximum of 45.05 per cent for seed cotton yield was observed in cross combination H1470 x H1236 followed by H1470 x H1098-i (37.84%). Heterosis was obtained for bolls/plant in H1470x H1098-i (31.55%), for boll weight in H1464 x H1236 (15.11%), for plant height in H 1471 x H1236 (12.77%), for monopodia in ISR12 x H1226 (56.67%), for sympodia in H1463 x H1226 (30.41%), for days to first flower in ISR12 x H1226 (-13.81%) and for seed/boll in H1476 x H1226 (8.27%). The cross combination involving H1470 and H1236 parents recorded significant positive heterosis for most of the characters. Thus, the parents H1470 and H1236 can be used for exploitation of heterosis. The study also revealed good scope for commercial exploitation of heterosis as well as isolation of pure lines among the progenies of other heterotic F1 hybrids.