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In order to clarify the phylogenetic relationships of the species classified in the genus Kluyveromyces (Saccharomycetaceae), three partial base sequences of 18S and 26S rRNAs of eighteen strains were determined. The regions determined of the strains corresponded to positions 1451 through 1618 (168 bases) of 18S rRNA and to positions 1611 through 1835 (225 bases) and 493 through 622 (130 bases) of a strain (IFO 2376) of Saccharomyces cerevisiae. The analyses of the partial base sequences suggested that the genus Kluyveromyces is phylogenetically heterogeneous, ranging from the strains that are quite close to the strain of S. cerevisiae to the strains that are distinct enough to be classified in genera separate from the genus Saccharomyces. From our sequence data, we concluded that the extent of the genus Kluyveromyces should be restricted to only one species, K. polysporus, the type species of the genus. Kluyveromyces phaffii was also distinct enough to deserve another genus. Kluyveromyces cellobiovorus was not close to any of the strains of Kluyveromyces species examined, and should be excluded from the genus. Most of the strains of the species examined were fairly close to the strain of S. cerevisiae.

bioscience, biotechnology, and biochemistry

Phylogenetic Relationships of Species of the Genus<i>Kluyveromyces</i><scp>van der</scp>W<scp>alt</scp>(Saccharomycetaceae) Deduced from the Partial Sequences of 18S and 26S Ribosomal RNAs

Phylogenetic Relationships of Species of the GenusKluyveromycesvan derWalt(Saccharomycetaceae) Deduced from the Partial Sequences of 18S and 26S Ribosomal RNAs