Deoxyribonucleic Acid Relatedness among Species of the Genus Saccharomyces Sensu Stricto

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Abstract
Twenty-four species assigned to the genus Saccharomyces sensu stricto were examined for deoxyribonucleic acid relatedness. Results with type strains demonstrated the presence of four distinct species: S. cerevisiae, S. bayanus, S. carlsbergensis, and S. kluyveri. S. carlsbergensis NRRL Y-12693T showed intermediate relatedness between S. cerevisiae and S. bayanus and has a genome size approximately 1.5 times those of the last two species. These data suggest S. carlsbergensis to be a partial amphidiploid which may have arisen from natural hybridization between S. cerevisiae and S. bayanus.

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