Vol. 12, Issue 12 (2023)

Author(s):
Naghera YV, Vavdiya PA, Mungra KS and Prajapati MR

Abstract:
Using a six-parameter model, generation mean analysis was performed on two interspecific crosses of diploid cotton, GBhv-302 PA-812 and GBhv-302 ARBa-1502. To assess the sufficiency of the additive-dominance model, simple scaling tests and joint scaling tests were performed. In one or more of the characters tested, estimates of dominant (h) gene action were larger than estimates of additive (d) gene action. Among epistasis, additive × additive (i) kind of gene action was shown to be significant in cross GBhv-302 × PA-812 for 2.5% span length (mm), Fiber strength (g/tex) and Fibre length uniformity ratio (%); GBhv-302 × ARBa-1502 for Fibre fineness (mv). While dominance × dominance (l) type of gene effect contributed significantly in cross GBhv-302 × PA-812 for Oil percentage. Duplicate epistasis gene action for all the traits under all cross, except the cross GBhv-302 × ARBa-1502 for the trait 2.5% span length (mm). none of the traits under study showed complementary type of gene interaction.