Vol. 11, Issue 11 (2022)

Author(s):
Jay R Kanasagra, Dr. MG Valu, Dr. Lata J Raval and Sajan Rupapara

Abstract:
This study was conducted to estimate heterosis, combining ability and gene action for seed cotton yield and its contributing characters by using line × tester mating design. Total 45 crosses were produced and tested along with one standard check at Cotton Research Station, JAU, Junagadh. The highest and positive standard heterosis for seed cotton yield per plant was recorded in the cross GTHV-15/220 × G.Cot-20 (73.92%) followed by GSHV-172 × G.Cot-38 (22.09%) and GTHV-15/220 × GJ.Cot-101 (20.21%). These crosses also recorded significant standard heterosis for the other four characters also. The results thus, showed that the heterosis for seed cotton yield per plant was associated with heterosis for its component characters. Good heterotic responses were accompanied by desirable and significant sca effects for different component characters. The highest yielding hybrid GTHV-15/220 × G.Cot-20 had also registered the highest positive sca effect for seed cotton yield per plant involved good x good general combiners for seed cotton yield per plant. The cross GSHV-172 × G.Cot-38 depicted a significantly desirable sca effect for the number of bolls per plant. Similarly, another best performing cross is GTHV-15/220 × GJ.Cot-101 exhibited a desirable and significant sca effect for the three characters. The result of combining ability revealed that days to flowering character followed additive gene action and remaining characters depicted non-additive gene action.