Combining ability, heterosis and inbreeding depression for yield and yield components in yellow sarson.

摘要

Combining ability, heterosis and inbreeding depression were estimated in yellow sarson (Brassica campestris) for 11 quantitative characters. Non-additive genetic variance was predominant for all characters in both F1 and F2 generations except for 1000-seed weight in F2 generation. The parents 66-197-3 and YSIK-742 in F1 generation, and RAUYS-3 in F2 generation were the best general combiners. For seven characters, the best F2s on the basis of SCA involves one parent with high GCA effect and the other with poor or average GCA effects. The hybrids which exhibited highest heterosis also showed higher inbreeding depression. Heterosis over better parent was highest for siliquae/plant (162.9%), followed by economic yield/plant (129.4%), biological yield/plant (118.7%), and primary branches/plant (88.1%).