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  • Title: Phylogenetic analysis of the ballistosporous anamorphic genera Udeniomyces and Bullera, and related basidiomycetous yeasts, based on 18S rDNA sequence.
    Author: Suh SO, Nakase T.
    Journal: Microbiology (Reading); 1995 Apr; 141 ( Pt 4)():901-6. PubMed ID: 7773393.
    Abstract:
    The small subunit nuclear ribosomal DNA (18S rDNA) sequence was determined for twelve species of basidiomycetous anamorphic yeasts, i.e. three species of Udeniomyces, seven species of Bullera, Cryptococcus albidus and Phaffia rhodozyma. For phylogentic analysis, these sequences were aligned with published sequences for 36 other fungal species. Molecular phylogenetic analysis of maximum likelihood and parsimony showed that the 44 species of basidiomycetes analysed were divided into three major lineages. The ballistosporous yeast genera Udeniomyces and Bullera were clearly separated. On the phylogenetic tree, Udeniomyces megalosporus, U. puniceus and U. piricola showed a very close relationship with one another, and composed a lineage with Mrakia frigida, P. rhodozyma and Cystofilobasidium capitatum at high bootstrap confidence level. On the other hand, eight species of Bullera made lineages with selected species of Tremella (Tremellaceae), Filobasidium and Filobasidiella (Filobasidiaceae), Cryptococcus albidus and Trichosporon cutaneum. The molecular phylogeny deduced from the 18S rDNA sequence showed a possibility of heterogeneity among the species of Bullera at the generic level.
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