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Abstract

During a survey of the culturable soil fungal population in samples collected in Taylor Valley, South Victoria Land, Antarctica, 13 basidiomycetous yeast strains with orange-coloured colonies were isolated. Phylogenetic analyses of internal transcribed spacer (ITS) and partial LSU rRNA gene sequences showed that the strains belong to the clade of the Tremellales (Tremellomycetes, Agaricomycotina), but did not correspond to any of the hitherto recognized species. Two novel species, sp. nov. (type strain ANT-03-116 =CBS 10920 =PYCC 5970) and sp. nov. (type strain ANT-03-071 =CBS 10919 =PYCC 5967), are described to accommodate ten and three of these strains, respectively. Analysis of ITS sequences demonstrated intrastrain sequence heterogeneity in . The latter species is also notable for producing true hyphae with clamp connections and haustoria. However, no sexual structures were observed. The two novel species can be considered obligate psychrophiles, since they failed to grow above 20 °C and grew best between 10 and 15 °C.

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2010-06-01
2019-12-09
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vol. , part 6, pp. 1466 - 1472

Location and soil properties of sites in South Victoria Land.

Phylogenetic tree of strains of sp. nov. and sp. nov. and related species in the clade (Tremellales, Tremellomycetes, Agaricomycotina) obtained by neighbour-joining analysis of LSU rRNA gene (D1/D2 domains) sequences using PAUP 4.0b8.

[PDF file of Supplementary Table S1 and Fig. S1](57 KB)



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