Small subunit ribosomal RNA gene sequences were determined in six species of the genus
Tilletiopsis, in addition to
Tilletiaria anomala. The phylogenetic trees were constructed for the species of the genus
Tilletiopsis, in addition to
T. anomala and related taxa by neighbor-joining and maximum likelihood methods. The phylogenetic trees showed that the basidiomycetous yeasts and related taxa were divided into three main clusters. Six species of the genus
Tilletiopsis, in addition to
T. anomala, constituted a cluster with
Sympodiomycopsis paphiopedili, Tilletia caries,
Ustilago hordei and
U. maydis (cluster 1). In cluster 1,
Tilletiopsis species and
T. anomala constituted a subcluster with
S. paphiopedili and
T. caries (cluster 1b). The reliability of cluster lb was statistically well supported. On the other hand,
Sporobolomyces roseus, the type species of the genus
Sporobolomyces, was located at cluster 2 together with
Bensingtonia species,
Erythrobasidium hasegawianum, Kondoa malvinella, Leucosporidium scottii, Rhodosporidium toruloides and
Sporidiobolus johnsonii. This result clearly showed the phylogenetic divergence between the genera
Tilletiopsis and
Sporobolomyces; whereas the genera
Tilletiopsis and
Sporobolomyces have common chemotaxonomic characteristics, i.e., the lack of xylose in the cells and the possession of Q-10 as the major ubiquinone.
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