Showing papers by "Junta Sugiyama published in 1993"

Phylogenetic relationships among Taphrina, Saitoella, and other higher fungi.

Abstract: To determine the phylogenetic placement of the major groups of higher fungi, we sequenced the DNA sequences from the small-subunit ribosomal RNA (18S rRNA) coding regions from Taphrina wiesneri (synonym: T. cerasi) and Saitoella complicata and compared them to 18S rRNA sequences from the oomycetes, chytridiomycetes, zygomycetes, ascomycetes, and basidiomycetes. Here we demonstrate that the ascomycetes have at least two major evolutionary lineages. Taphrina wiesneri and Saitoella complicata form a monophyletic branch that diverged prior to the separation of other ascomycetes. The same treatment could be accorded to Schizosaccharomyces pombe.

Molecular systematics of the genus Zoogloea and emendation of the genus.

Abstract: Phylogenetic relationships among strains of Zoogloea and related taxa were determined by 16S rDNA sequencing and genomic DNA hybridization techniques. The 16S rRNA gene was amplified by the polymerase chain reaction with a pair of eubacterial consensus primers and sequenced directly by using an automated fluorescent DNA sequencer. Sequence comparisons and distance matrix tree analysis revealed that Zoogloea ramigera IAM 12136 (= N. C. Dondero 106, type strain) and Zoogloea sp. ATCC 19324 formed a lineage with Rhodocyclus purpureus in the β subclass of Proteobacteria. Z. ramigera IAM 12670 (= P. R. Dugan 115) was shown to belong to another cluster with Alcaligenes eutrophus and Pseudomonas cepacia in the β subclass. In contrast, Z. ramigera IAM 12669 (= K. Crabtree I-16-M) proved to be a member of the α subclass of the Proteobacteria, closely related to Agrobacterium tumefaciens. Genomic DNA hybridization studies also showed that there is genetic diversity among the strains currently designated Z. ramigera, but typical Zoogloea strains, characterized by their production of rhodoquinones, are highly related to each other and can be regarded as a single species. On the basis of the molecular data, together with the early phenotypic and chemotaxonomic information, we have emended the generic description of Zoogloea.

The higher fungus Protomyces inouyei has two group I introns in the 18S rRNA Gene

Abstract: The nucleotide sequence of the small-subunit rRNA (18S rRNA) coding gene in the higher fungus Protomyces inouyei contains two group I introns. This is the first report of two group I introns in the 18S rRNA coding region. Based on the comparison of the two introns of Protomyces inouyei with those of the green alga Ankistrodesmus stipitatus, and the other two higher fungi Pneumocystis carinii and Ustilago maydis, the Protomyces introns are group I introns containing the highly conserved sequence elements P, Q, R, and S. Intron A of Protomyces inouyei is located in the same position as in Pneumocystis carinii while intron B shares the location with that in Ustilago maydis. The phylogenetic relationships strongly support horizontal transfer of these group I introns.

Phylogeny among the basidiomycetous yeasts inferred from small subunit ribosomal DNA sequence.

Abstract: Summary: The sequence of the small subunit nuclear ribosomal DNA (18S rDNA) was determined for seven selected species of the teliospore-forming yeasts and Filobasidiaceae in the basidiomycetous yeasts. A phylogenetic tree, including published reference sequences, was inferred from 1623 sites which could be unambiguously aligned. The molecular phylogeny, using a chytridiomycete as an outgroup, divided the eight basidiomycetous yeasts into two groups which correlated well with both septal ultrastructure (simple pore or dolipore) and cellular xylose (present or absent). The first group included the teliospore-forming yeasts Rhodosporidium toruloides and Leucosporidium scottii, and Erythrobasidium hasegawianum, which is currently a member of the Filobasidiaceae. The second group was formed by the filobasidiaceous yeasts, comprising a Cystofilobasidium capitatum/Leucosporidium lari-marini/Mrakia frigida branch, and a Filobasidium floriforme/Filobasidiella neoformans branch. Our molecular data support the principal chemotaxonomic and ultrastructural evidence, which indicates a very close affinity between C. capitatum and L. lari-marini.

Septal Ultrastructure of Basidiomycetous Yeasts and their Taxonomic Implications with Observations on the Ultrastructure of Erythrobasidium Hasegawianum and Sympodiomycopsis Paphiopedili

Abstract: Septal pore ultrastructure of selected species of basidiomycetous yeasts was observed. Rhodosporidium dacryoidum and Leucosporidium fellii of the teliospore-forming yeasts have simple septal pores,...

Evolutionary Position of n-Alkane-assimilating Yeast Candida maltosa Shown by Nucleotide Sequence of Small-subunit Ribosomal RNA Gene

Abstract: We clarified the evolutionary position of Candida maltosa, an n-alkane-assimilating yeast, by sequencing the nucleotides of the small-subunit ribosomal RNA gene. Phylogenetic analyses showed the close evolutionary relationships of C. maltosa with C. tropicalis, C. viswanathii, C. albicans, C. parapsilosis, and C. guilliermondii, forming a sub-group within this genus.

Phylogenetic analysis of basidiomycetous yeasts by means of 18S ribosomal RNA sequences: relationship of Erythrobasidium hasegawianum and other basidiomycetous yeast taxa.

Abstract: The basidiomycetous yeast genusErythrobasidium Hamamoto, Sugiyama & Komagata, based on the type speciesE. hasegawianum Hamamoto et al., is characterized by filobasidiaceous basidia and the Q-10 (H2) system as its major ubiquinone. It is tentatively placed in the Filobasidiaceae. The molecular characterization is based on 18S ribosomal RNA sequence comparisons among the basidiomycetous yeasts, and the ultrastructural characterization on the cell wall and hyphal septal pores inE. hasegawianum clearly indicate a close relationship with the teliospore-forming yeastsRhodosporidium toruloides andLeucosporidium scottii. Our molecular phylogeny with statistical analysis suggests that the existing taxonomic system of basidiomycetous yeasts, based primarily on the morphology of basidia including the teliospores (probasidia), should be revised.