Heterotic analysis of GMS based hybrids of seed cotton yield and fibre quality traits in cotton (Gossypium hirsutum L.)

Abstract

The present investigation was undertaken with the objectives to study the extent of heterosis over better parent (Heterobeltiosis) and standard check (Standard heterosis) GN.Cot.Hy-14. Three lines were crossed with eight testers to obtain 24 hybrids in Line x Tester design. Studies revealed that for trait seed cotton yield per plant out of 24 crosses, seven hybrid manifested significant and positive standard heterosis. The maximum standard heterosis was depicted by S-D-2 x TCH 1716 (17.63 %) which was followed by G(T)-84 x TCH 1716 (15.58 %) and GMS Gregg x TCH 1716 (15.03 %). Among all the fibre quality characters, the cross combinations S-D-2 x BGDS 1033 (5.32 %) and S-D-2 x TCH 321 (3.11 %) displayed highly significant standard heterosis over check GN.Cot.Hy-14 for ginning outturn respectively. The magnitude of standard heterosis over check GN.Cot.Hy-14 was high in the cross combinations GMS Gregg x TCH1716 (4.35 %) for 2.5 per cent span length, (-2.38 %) GMS Gregg x TCH 1716, GMS Gregg x CCH 15-1 and G(T)-84 x CPD 1501 for fibre fineness and GMS Gregg x RAH 1069 (8.61 %), G(T)-84 x CPD 1501 (2.32 %) and GMS Gregg x TCH 1824 (1.66 %) for fibre strength.