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Inheritance of earliness in a cross between two varieties of tomato



Inheritance of earliness in a cross between two varieties of tomato



Ann Agric Sci 4(2): 111-120



Earliness behaved as a quantitative character. The F1 data suggested partial dominance for lateness, but the results from F2 data indicated dominance for earliness. It was explained that the earliness was masked in F1 plants because of the action of heterosis; when the hybrid vigor declined in the F2 population, the real dominance of earliness over lateness was manifested. The results were not adequate to draw a solid conclusion about the nature of gene action. The minimum number of genes responsible for a mean difference of 17 days was suggested to be at least 4 pairs of genes. A heritability value of 54.4% was obtained from the F2 data. Therefore selection for earliness on an individual plant basis in this cross is quite effective.

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