THE MOLECULAR PHYLOGENY OF THE Q10-EQUIPPED SPECIES OF THE HETEROBASIDIOMYCETOUS YEAST GENUS RHODOSPORIDIUM BANNO BASED ON THE PARTIAL SEQUENCES OF 18S AND 26S RIBOSOMAL RIBONUCLEIC ACIDS

摘要

Twelve strains of the Q10-equipped species of the teleomorphic yeast genus Rhodosporidium and the anamorphic yeast genus Rhodotorula were examined for the partial sequences of 18S and 26S rRNAs. In the positions 492 through 625 of 26S rRNA, the strains of R. kratochvilovae, R. paludigenum, R. diobovatum, R. sphaerocarpum, and Rh. graminis were linked at 71% or more maximum homologies to the type species of the genus Rhodosporidium (R. toruloides). Rhodosporidium dacryoidum constituted its own separate cluster (66% maximum homology). In the positions 1451 through 1618 of 18S rRNA, the strains of the above-mentioned species were divided into two clusters. The first cluster included R. kratochvilovae, R. paludigenum, R. diobovatum, R. sphaerocarpum, and Rh. graminis (within 0 or 2 base differences), and the second cluster included the only species, R. dacryoidum (11 base differences). These results indicate that R. dacryoidum should be classified in a separate new genus.