Gene interaction and genetics for yield and its attributes in cotton (Gossypium hirsutum L.)

Abstract

The present investigation was undertaken with a view to generate genetic information on gene effects for seed cotton yield and its component traits in cotton (Gossypium hirsutum L.). The experimental materials consisted of six generations, namely P1, P2, F1, F2, BC1, BC2 of four crosses of cotton viz., GJHV-522 × GJHV-473 (cross 1), GJHV-544 × GJHV-523 (cross 2), GJHV-497 × GJHV-511(cross 3) and G. Cot 20 × GJHV-519 (cross 4). Scaling tests such as A, B and C were significant in all crosses for all the three traits besides significance of other tests showing presence of epistasis except number of boll per plant in cross 4. The 𝜒2 value at three degrees of freedom were significant in all the traits in four crosses supported the presence of higher order epistasis except in number of sympodia per plant in cross 2 indicated that adequacy of additive-dominance model. Scaling test and 𝜒2 value at three degrees of freedom were significant in crosses 1 and 3 in number of sympodia per plant but all main effect and digenic effect found non significant indicated that presence of epistasis or linkage.