AbstractOne hundred eighty-four red-fruited tomato accessions from various origins were screened in Puerto Rico in 1981 for shelf-life of ripened fruit; 13 were found to have exceptionally long life (16 weeks or more). From these, six lines were selected and crossed with Kewalo from Hawaii and F1, F2 and F3 generations as well as BC1 and F2 of BC1, were grown. Long shelf-life was controlled by several genes in these crosses, and discrete ratios were not obtained. Among the hybrids longest shelf-life was found in individuals of F2 families. Both recessive and dominant genes were segregating. Individual plants with fruit of exceptional shelf-life were obtained even in the most advanced generations. Pedigree selection is suggested as a useful technique for concentrating the genes for long shelf-life in o standard variety. Pure lines can then be crossed to combine genes from different sources. Minor genes for long shelf-life in homozygous pure lines may prove more useful than simple dominant genes in hybrids.
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