Abstract
A complete diallel cross involving four experimental strains and six standard cultivars of Indian mustard. Brassica juncea (L.) Czern. and Coss., was investigated for the inheritance of leaf length and leaf width. Considerable heterosis and heterobeltiosis were found in certain hybrid combinations for both characters. Several crosses exceeded the performance of the best cultivar. Partial dominance for leaf length and overdominance for leaf width were observed. Highly significant additive gene effects were found for both characters bur only about one third of the total variance exhibited by leaf length and about one sixth of that by leaf width may be ascribed to this component. The correlation between the two characters was positive. It was concluded that breeding programs should put more emphasis on leaf length rather than leaf width for effective manipulations of leaf size.
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