Genetic architecture of oil content and seed yield in biparental progenies of Indian mustard [Brassica juncea (L.) Czern and Coss]

The genetic architecture of oil content and seed yield per plant was studied in two sets of each biparental progenies (BIPs) of RH-725 x Urvashi (cross I), DRMRIJ-31 (Giriraj) x Urvashi (cross II) and PM - 27 x Urvashi (cross III) in Indian mustard [Brassica juncea (L.) Czern and Coss] developed through NCD II. The study was conducted at Agricultural Research Station (ARS), Ummedganj-Kota and College of Agriculture, Ummedganj-Kota during Rabi, 2022-23 and 2023-24. The result reported that the variance due to male x female interaction was found to be prevalent in both oil content and seed yield per plant in the BIPs of all the three crosses. The dominance variance was solely responsible for variance in oil content in the BIPs of cross I and seed yield per plant in the BIPs of cross III, in the rest both additive variance and dominance variance played a significant role; however, the dominance part was found to be more impactful. Additionally, average degree of dominance and dominance ratio exposed the non-additive gene effect in the expression of oil content in seed yield per plant in all the three BIPs. Hence, the selection for these traits would not be effective selection therefore the selection should be practiced at advanced segregating generations.