It is inferred that dominant gene action was responsible for the expression of head weight, length and breadth, and core length. For stem length and plant height, both the additive and dominant gene actions were responsible, though the magnitude of the former was greater than of the latter. Parents 662 and 668 were found be the best combiners for almost all characters. Among the 45 F1, hybrid 662 × 668 is recommended for coromercia' cultivation on the basis of gieffects of the. parents effects, heterosis percentage, and per se performance of this hybrid. Other hybrids, namely, 665 × 666, 665 × 679 and 666 × 672 could be used in the double-cross hybrid seed production after testing their self-incompatibility levels and S-allele × sexual organ interactions.
Combining ability, heterosis, self-incompatibility, cabbage
