Author(s):

Dr. HV Solanki, Dr. DR Mehta, Dr. RB Madariya, VB Rathod and Dr. RK Odedra

Abstract: Gene effects for oil content in cotton (Gossypium hirsutum L.) was studied 21 generations namely P₁, P₂, F₁, F₂, F₃, B₁, B₂, B₁₁, B₁₂, B₂₁, B₂₂, B_1S, B_2S, B₁ x F_1, B₂ x F_1, F₂ x P_1, F₂ x P_2, F₂ x F_1, B₁ bip, B₂ bip and F₂ bip of four crosses viz., Deviraj x GBHV-170 (cross-1), G.Cot-10 x MR-786 (cross-2), G.Cot-12 x GTHV-95/145 (cross-3) and 76IH20 x GJHV-460 (cross-4). Scaling tests viz., A, B, D, B₁₁, B₁₂, B₂₁, B₂₂, B₁s, B₂s and (F₂-L₃) in cross-1; B, D, B₂₁, B₂₂, B₁s, B₂s, X, Z, (B₁-L₁), (B₂-L₂) and (F₂-L₃) in cross-2; A, B, C, D, B₁₁, B₁₂, B₂₂, B₂₁, B₁s, Y and (B₁-L₁) in cross-3 and D, B₁s, Z and (B₁-L₁) in cross-4 were significant indicating presence of digenic and/or trigenic interactions. In six-parameter model, significant 𝜒2₍₂₎ value at 15 degrees of freedom revealed the presence of higher order epistasis and/or linked digenic interactions. In ten-parameter model, 'm', [d], [h], [i], [j], [1], [w], [x], [y] and [z] in cross-1; for 'm', [h], [i], [j], [1], [x], [y] and [z] in cross-2; 'm', [d], [h], [i], [j], [1], [w], [x] and [z] (except [y]) in cross-3 and 'm', [d], [j], [1], [w], [x] and [z] in cross-4 were significant. The 𝜒2₍₃₎ value was significant at 11 degrees of freedom indicating the presence of higher order epistasis. In twelve-parameter model, m+[h]+[l], m+[i], [p²i], [pl], [p²l], [p³l] and [p⁴l] in cross-1; m+[h]+[l], m+[i], [pi], [p²i], [p²l], [p³l] and [p⁴l] in cross-2; [d], m+[h]+[l], m+[i], [pi], [pj], [p²j], [pl], [p²l] and [p³l] in cross-3 and m+[h]+[l], m+[i], [p²l], [p³l] and [p⁴l] in cross-4 were significant. The 𝜒2₍₄₎ value was significant at nine degrees of freedom indicating the presence of higher order linkage. Duplicate type of epistasis was responsible for the inheritance of oil content in all the four crosses of cotton.

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