1887

Abstract

The evolutionary affinities among several morphologically and physiologically similar species of the ascogenous yeast genus were studied by techniques of genome comparison. Among the organisms studied, two clusters of related strains were identified by deoxyribonucleic acid base composition and sequence relatedness. These clusters showed little relatedness to each other or to the other strains studied. Several strains of , as well as the type strain of , exhibited 78 to 98% base sequence complementarity with the type strain of . These species are all associated with coniferous trees. An additional strain of shared 62% of its nucleotide sequences with the type strain. Three other yeasts resembling but isolated from exudates of alder trees showed >98% complementarity among themselves but <10% relatedness to the type. These strains are considered to represent a new species, . The results suggest the inadequacy of current taxonomic criteria and the need for new approaches to yeast systematics.

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1979-01-01
2024-04-13
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