Department of Plant Breeding, G. B. Pant University of Agriculture and Technology, Pantnagar 263145.
* Present address: Tirhut College of Agriculture, Deptt. of Seed Technology, Dholi (Muzaffarpur) Bihar 843121.
Low genotypic coefficient of variation for harvest index (HI) but high for grain yield and biological yield was observed in F1 population of toria. Low GCV was observed for this attribute in the elite stocks of Brassica campestris and Brassica jnncea but it was high in Brassica rugosa. It was positively associated with grain yield. Seed yield was the major contributor to variation for harvest index in three Brassica species. Additive gene action was preponderant for HI but nonadditive for seed and biological yield. The parents PT 76-3, PT 76-5 and PT 76-1 were good general combiners. The highest BP heterosis (61.23%) for harvest index was observed in the hybrid PT 76-2 x PT 76-6.
Heterosis, harvest index, Brassica spp
