Vol. 12, Issue 1 (2023)

Author(s):
Dr. Movaliya HM, Dr. Chovatia VP, Dr. Madariya RB, Dr. Pipaliya HR and Dr. Valu MG

Abstract:
The present investigation was undertaken with a view to generate genetic information on gene effects for seed yield and oil content in Castor (Ricinus communis L.). The experimental materials consisted of twelve generations, namely P₁, P₂, F₁, F₂, B₁, B₂, B₁₁, B₁₂, B₂₁, B₂₂, B_1(s) and B_2(s) of five crosses viz., JM 6 x 48-1 (cross I), JI 433 x SKI 346 (cross II), JI 436 x PCS 124 (cross III), SKI 346 x JI 35 (cross IV) and SKI 346 x SKI 215 (cross V). Significance of simple scaling tests and Cavali’s joint scaling test indicated the presence of gene interactions for seed yield per plant (g) and oil content (%) in all five crosses. Based on six-parameter model, significant ݜ’²₍₂₎ pointed out the presence of trigenic or higher order epistasis in all the crosses for seed yield per plant and oil content. The trigenic ten-parameter model was found to be adequate for seed yield per plant in cross III and cross IV; and for oil content in cross IV. On other hand, ݜ’²₍₃₎ with two degrees of freedom was found significant for seed yield per plant in cross I, II and V; and for oil content in cross I, II, III and V showing the presence of higher order epistasis and/or linkage.