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Published online ahead of print on 11 August 2009 as doi:ijs.0.015412-0
Int J Syst Evol Microbiol (2009); DOI 10.1099/ijs.0.015412-0
© 2009 International Union of Microbiological Societies
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Dioszegia antarctica sp. nov. and Dioszegia cryoxerica sp. nov., novel psychrophilic basidiomycetous yeasts from polar desert soils in Antarctica

Laurie B. Connell1, Regina Redman2, Russel Rodriguez3, Anne Barrett1, Melissa Iszard1 and Álvaro Fonseca4,5

1 School of Marine Sciences, University of Maine;
2 College of Forest Resources, University of Washington;
3 U.S. Geological Survey, Western Fisheries Research Center;
4 Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa

5 E-mail: amrf{at}fct.unl.pt

During a survey of the culturable soil fungal population in samples collected in Taylor Valley, South Victoria Land, Antarctica, thirteen basidiomycetous yeast strains with orange-coloured colonies were isolated. Phylogenetic analyses of ITS and partial LSU rRNA gene sequences showed that the strains belong to the Dioszegia clade of the Tremellales (Tremellomycetes, Agaricomycotina), but did not correspond to any of the hitherto recognised species. Two novel species, Dioszegia antarctica (CBS 10920T = PYCC 5970T) and D. cryoxerica (CBS 10919T = PYCC 5967T) are described to accommodate ten and three of those strains, respectively. Analysis of ITS sequences demonstrated intra-strain sequence heterogeneity in D. cryoxerica. The latter species is also notable for producing true mycelium 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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