DIALLEL CROSS ANALYSIS OF QUANTITATIVE CHARACTERS IN TOBACCO

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Abstract
Analysis of a complete diallel cross test using 8 varieties of fluecured tobacco indicated that additivity in inheritance of the character s tested (yield, grade index, crop index, days to flower, number of leaves, height, filling value, lamina weight, alkaloid content) was an important factor for the selected set of varieties. Dominance was not significant for filling value and just above the .05 level of probability for yield and alkaloid content. It is also indicated by indirect evidence that epistasis was probably not important in the present material. The overall degree of dominance showed partial dominance for most of the characters, and overdominance for yield. The average frequency of positive and negative genes in the parents indicated asymmetrical distribution with an excess of dominant genes.