The genetic relatedness of 60 strains in the basidiomycetous yeast genera
Rhodosporidium and
Rhodotorula was studied by the DNA-DNA hybridization using the nitrocellulose filter technique. Degrees of the intraspecific reassociation among the DNAs from the strains of
Rhodosporidium infirmominiatum, Rhodosporidium diobovatum, Rhodosporidium sphaerocarpum, and
Rhodosporidium dacryoidum ranged from 64 to 99%. The mating-type strains of
Rhodosporidium toruloides were divided into four homology clusters. The degrees of DNA-DNA reassociation between the mating-type strains and the self-sporulating strains in
Rhodosporidium toruloides were very low. (18%) indicating the absence of relatedness between them. The strains of
Rhodotorula glutinis were divided into five homology clusters. Among these strains, some, including the type strain, showed close relatedness to
Rhodosporidium diobovatum, some to
Rhodosporidium toruloides (self-sporulating), and some to
Rhodotorula rubra, and
Rhodotorula pilimanae. The strains of
Rhodotorula minuta were divided into four homology clusters. A close relationship was found between some strains of
Rhodotorula minuta including the type strain and a strain of
Rhodotorula pallida. There was a very close relationship between the
Rhodotorula sinensis strain and the strains of
Rhodosporidium infirmominiatum.
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