Vol. 11, Issue 7 (2022)

Author(s):
Jay R Kanasagra, Dr. MG Valu, Dr. Lata J Raval and Foram A Thesiya

Abstract:
The present investigation was taken up to study the heterotic responses, combining ability and gene action for fibre quality characters of 45 hybrid combinations. These hybrids along with one standard check are evaluated in a Randomized Block Design (RBD) with three replications during Kharif 2020. The results of heterotic responses revealed that the cross combination GBHV-185 × G.Cot-10 showed the highest and most desirable significant standard heterosis for oil content (%), GJHV-589 × G.Cot-10 for ginning percentage, whereas the cross GSHV-173 × G.Cot-10 for 2.5% span length. For fibre strength and fibre fineness, none of the crosses showed a desirable significant standard heterotic response. The result of combining ability showed that lines such as GSHV-173, GBHV-185 and GJHV-589, and testers such as GJ.Cot-101 and G.Cot-10 were proved as good general combiners for oil content and lint quality parameters. For ginning percentage, a cross GJHV-574 × G.Cot-10 exhibited the highest positive and significant sca effect. The cross GJHV-577 × G.Cot-38 had a good combining ability effect for oil content. For 2.5% span length, only one cross showed a positive and significant sca effect i.e. GJHV-581 × G.Cot-10. None of the cross combinations witnessed a significant and desirable sca effect in the case of fibre strength. For fibre fineness, only one cross GSHV-172 × G.Cot-38 (-0.36) showed a desirable, negative and significant sca effect.