Mrakia arctica sp. nov., a new psychrophilic yeast isolated from an ice island in the Canadian High Arctic |
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| Authors: | Masaharu Tsuji Yukiko Tanabe Warwick F Vincent Masaki Uchida |
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| Institution: | 1. National Institute of Polar Research (NIPR), 10-3 Midori-cho, Tachikawa, Tokyo 190-8518, Japan;2. Department of Polar Science, SOKENDAI (The Graduate University for Advanced Studies), 10-3 Midori-cho, Tachikawa, Tokyo 190-8518, Japan;3. Département de Biologie, Centre for Northern Studies (CEN), Université Laval, Québec, QC G1V 0A6, Canada |
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| Abstract: | Two strains of a psychrophilic basidiomycetous yeast species belonging to the genus Mrakia were isolated from a melt-pool mat community, on an ice island located in Disraeli Fjord, Ellesmere Island in the Canadian Arctic. Analysis of the large subunit rDNA D1/D2 domain and internal transcribed spacer region sequences indicated that these strains represent a novel species, and the name Mrakia arctica sp. nov. is proposed. This new species could grow at sub-zero temperatures and in vitamin-free media. Moreover, lipase and cellulase enzymes of M. arctica were strongly active even at ?3 °C. These results suggest an important role for M. arctica in the biogeochemical cycle of glacial ecosystems. |
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| Keywords: | Arctic yeast Basidiomycota Cystofilobasidiales LSU D1/D2 domain Taxonomy |
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