L × T Analysis in F5 Lines of RGR Population Derived through Exploitation of Heterotic Groups in Gossypium Species

The combining ability studies assist in choosing the desirable parents for crossing in hybrid development. Forty derived hybrids generated by crossing ten F5 lines to the four testers for assessing combining ability. Hybrids along with the parents were planted in randomized block design and analysis of variance suggested that lines had significant differences for all the characters studied except number of monopodia per plant, reproductive points on sympodia and ginning outturn. Significant line effect of seed cotton yield and lint yield was revealed by ANOVA for combining ability. Variance of sca was higher than Variance of gca for all characters apart from seed cotton yield and lint yield. RGR F6 9 and RGR F6 7 lines were recorded to be the highest seed cotton yielding lines. The gca effects were highly significant for seed cotton yield and lint yield in RGR F5 1 and RGR F5 5 lines. RGR F5 1 x DR-8, RGR F5 7 x DR-8 and RGR F5 8 x DR-8 were the top three hybrids for seed cotton yield. The sca effect was positively significant in hybrids RGR F5 7 × DR-8 and RGR F5 1 × DR-8 for seed cotton yield.