Abstract
Antarctica is considered one of the most extreme environments on Earth because of its low temperatures, dryness, high incidence of solar radiation and low nutrient availability. Nevertheless, microorganisms including yeast have successfully colonized Antarctica; however, little is known about Antarctic yeast. In this study, cultivable yeast from soil samples collected from several islands of the South Shetland archipelago and Antarctic Peninsula were identified and characterized at different levels. Most yeasts were psychrotolerant and belonged to eleven genera, with the majority belonging to the Cryptococcus genus. Most yeasts were able to oxidize dextrin, α-d-glucose, sucrose and d-trehalose and to assimilate turanose, d-xylose, dextrin, d-trehalose, α-d-glucose and salicin. Evaluation of twelve hydrolytic enzymes revealed that yeast isolates displayed four to seven different enzyme activities, with lipase, alkaline phosphatase and invertase activities being observed in the majority of isolates. The isolates identified as Cryptococcus gastricus, Cryptococcus victoriae, Cryptococcus gilvencens, Leucosporidium sp. and Rhodotorula mucilaginosa displayed toxicity against other yeast isolates via the secretion of a protein factor. These results reflect the adaptation of yeast to their environment. The yeasts identified in this study have the potential for use as a biosource for the production of enzymes for industrial applications that require high enzyme activities at low temperatures.
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This work was supported by Grant T_07-13 from the Instituto Antártico Chileno.
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Troncoso, E., Barahona, S., Carrasco, M. et al. Identification and characterization of yeasts isolated from the South Shetland Islands and the Antarctic Peninsula. Polar Biol 40, 649–658 (2017). https://doi.org/10.1007/s00300-016-1988-9
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DOI: https://doi.org/10.1007/s00300-016-1988-9