Journal
SYSTEMATIC AND APPLIED MICROBIOLOGY
Volume 23, Issue 1, Pages 63-70Publisher
ELSEVIER GMBH, URBAN & FISCHER VERLAG
DOI: 10.1016/S0723-2020(00)80047-8
Keywords
taxonomic significance of fucose; carbohydrate composition; phylogeny; Urediniomycetes
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The carbohydrate compositions of cell wall were determined in the strains of class Urediniomycetes, mainly ballistoconidium-forming yeasts and related taxa. The major component of cell wall was mannose, and glucose was included as the second component, but xylose was not detected in any strain. Out of 41 strains examined, 39 contained galactose, 14 contained arabinose and 12 contained rhamnose. As a minor component, fucose was detested in 30 strains but nor in 11 strains. A phylogenetic tree based on 18S rDNA sequences indicated that the fucose-lacking strains, Euyrhrobasidium hasegawianum, Rhodotolura aurantiaca, R. lactosa, R. minuta, Sakaguchia dacryoidea, Sporobolomyces coprosmae, S. elongatus, S. foliicola, S. gracilis, S. kluyverinielii and S. oryzicola, constituted a distinct cluster from those strains which contained fucose. This cluster corresponded to one of the five subclusters, the Erythrobasidium cluster, in the phylogenetic tree of class Urediniomycetes. The carbohydrate composition of cell wall is believed to reflect the phylogenetic relationships among basidiomycetous fungi. The presence or absence of fucose in cell wall should be regarded as an important phenotypic characteristic in the taxonomy of basidiomycetes.
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