Heterosis and inbreeding depression for yield and its component traits in F1 hybrids and F2 population of interspecific crosses in Brassica species.

Abstract

Seven lines of oilseed Brassica species were studied for heterosis and inbreeding depression for nine yield and its contributing traits. In F1 hybrids, maximum heterosis was recorded for siliquae per plant followed by numbers of secondary branches and seed yield per plant. Considerable inbreeding depression was observed in F2 population which was highest for seed yield per plant followed by numbers of primary branches. Highest inbreeding depression for seed yield per plant was observed in cross GPM-O-5XT-42 followed by cross NGM-17XT-42. It was lowest in cross NGM-43XT-42. In F1 generation higher heterosis was observed in crosses NGM-17XBN-10, PL-58XBN-10, GPM-O-5XBN-10 and NGM-43XBN-10 for seed yield per plant. Inbreeding was lower when BN-10 was used as male parent in combination with NGM-17, PL-58, GPM-O-5 and NGM-43 as female parent.