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Taxonomy and richness of yeasts associated with angiosperms, bryophytes, and meltwater biofilms collected in the Antarctic Peninsula
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Taxonomy and richness of yeasts associated with angiosperms, bryophytes, and meltwater biofilms collected in the Antarctic Peninsula
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Taxonomy and richness of yeasts associated with angiosperms, bryophytes, and meltwater biofilms collected in the Antarctic Peninsula
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Journal Article
Taxonomy and richness of yeasts associated with angiosperms, bryophytes, and meltwater biofilms collected in the Antarctic Peninsula
2019
Overview
The interest in the diversity of yeasts in the Antarctic environment has increased in recent years, mainly because Antarctic microbiology is a recent science, and little is known about the biodiversity and genetic resources of the microorganisms that inhabit this ecosystem. This study aimed to determine the diversity of epiphytic yeasts in samples of Deschampsia antarctica, Colobanthus quitensis, and bryophytes, as well yeasts present in biofilms collected from Antarctic meltwater. Samples were collected in the summer of 2014 and 2015 during expeditions organized by the Brazilian Antarctic Program. A total of 310 yeasts were isolated, and 34 species were identified by sequencing the D1/D2 domains of the rDNA region belonging to 18 genera. The species Vishniacozyma victoriae and Mrakia gelida were the most abundant. Dioszegia antarctica and Leucosporidium creatinivorum were found only in plant substrates. Most psychrophilic yeasts were isolated from biofilms, including Glaciozyma antarctica, Glaciozyma martinii, Mrakia gelida, Mrakia frigida, Mrakia robertii, Phenoliferia glacialis, and Phenoliferia psychrophenolica, suggesting that the substrates examined in this study represented an interesting habitat for the isolation and characterization of epiphytic and non-epiphytic yeasts that colonize the Antarctic region.
