Journal
INTERNATIONAL JOURNAL OF SYSTEMATIC AND EVOLUTIONARY MICROBIOLOGY
Volume 69, Issue 4, Pages 944-948Publisher
MICROBIOLOGY SOC
DOI: 10.1099/ijsem.0.003216
Keywords
Arctic yeast; Basidiomycota; Cystofilobasidiales; rRNA gene D1/D2 domain; taxonomy
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Funding
- NIPR Research Project [KP-309]
- JSPS [16H06211, 16H05885]
- Institution for Fermentation, Osaka [Y-2018-004]
- ArCS (Arctic Challenge for Sustainability) by the Ministry of Education, Culture, Sports, Science and Technology, Japan
- Natural Sciences and Engineering Research Council of Canada
- ArcticNet/Sentinel North project NEIGE (Northern Ellesmere Island in the Global Environment)
- Polar Continental Shelf Program (PCSP)
- NIPR publication subsidy
- Grants-in-Aid for Scientific Research [16H05885, 16H06211] Funding Source: KAKEN
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Four strains isolated from sediment sampled at the front of a retreating glacier on northern Ellesmere Island in the Canadian high Arctic, namely JCM 32575(T), JCM 32576, JCM 32577 and JCM 32578, belong to a novel psychrophilic basidiomycetous yeast species in the genus Mrakia. Molecular phylogenetic analysis indicated that these strains are most closely related to the type strains of Mrakia aquatica and Mrakianic combsii, but with 8-9 and 7-12 nt substitutions in ITS and in the D1 /D2 domain of the LSU rRNA gene, respectively. The strains grew at sub-zero temperatures and in vitamin-free media, with lipase and cellulase highly active even at -3 degrees C. These characteristics likely allow this yeast species to grow and survive in extremely cold, oligotrophic environments, such as the fronts of retreating glaciers in the high Arctic. The name Mrakia hoshinonis sp. nov. is proposed, with type strain JCM 32575(T) (UAMH 11969) and MycoBank number MB 825484.
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