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Genetic Study of Yield and Some of Its Components in Brassica campestris L. Var. ‘Toria’¹

Four strains of Brassica campestris L. var. ‘Toria’ and their F₁ and F₂ progenies were studied with respect to yield and yield components. The degree and direction of heterosis varied greatly for different characters and also for different crosses. Both additive and nonadditive gene actions were evident in controlling the characters. Inbreeding depression was significant for number of fruits per plant and total seed yield per plant. The dominance relationships were highly variable. Both positive and negative directions of dominance were indicated for all characters. Heritability estimates were relatively high for all characters. Total seed yield was correlated with number of fruits per plant, number of seeds per fruit, and fruit length. Evidence was obtained for the feasibility of selection in early generations in this crop.

Key Words: Heterosis • Inbreeding deprestion • Correlation

² Assistant Professor and Lecturer, respectively.

Received for publication April 12, 1972.