Browsing by Author "Theodore W. Horner"

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    A Three-year Study of General and Specific Combining Ability in Tomatoes
    (2007) Theodore W. Horner; Lana, E.P.
    Estimates of variance components due to parents, general and specific combining effects and their interactions with years were summarized for six tomato characters for a three-year tomato experiment involving six parent lines and their fifteen crosses. These estimates were interpreted under a set of genetic assumptions in the light of (A) the ratios of general combining variance to covariance of parents and their general combining effects to variance of general combining effects, (B) phenotypic and genotypic correlations of parent values and their general combining effects, and (C) genotype x year interaction. It was found that (A) the simple genetic model of two alleles per locus and no dominance or epistasis did not provide an altogether adequate explanation of early and total yield for the characters: fruit size, U. S. No. 1 yield, and yield of all grades and (B) genotype x year interactions may be due to a uniform scale change from one year to another.