Halophilic-psychrotrophic bacteria of an Alaskan cryopeg—a model for astrobiology
- Autores: Spirina E.1, Durdenko E.1, Demidov N.1, Abramov A.1, Romanovsky V.2, Rivkina E.1
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Afiliações:
- Institute of Physicochemical and Biological Problems of Soil Science
- Geophysical Institute
- Edição: Volume 51, Nº 13 (2017)
- Páginas: 1440-1452
- Seção: Article
- URL: https://journals.rcsi.science/0031-0301/article/view/167318
- DOI: https://doi.org/10.1134/S0031030117120036
- ID: 167318
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Resumo
Cryopegs, lenses of hypersaline unfrozen soil or water within permafrost, are a model for astrobiology, since free water can only be present on cryogenic bodies and planets in the form of brine. In this paper the diversity of aerobic halophilic-psychrotrophic microorganisms from an Alaskan cryopeg (Barrow Cape) were studied and described for the first time. This cryopeg is characterized by a constant subzero temperature (–7°C), high salinity (total mineralization is about 120 g/L) and isolation from external influences for a geologically significant period of time. Our study has revealed a large number of microorganisms capable of growth at low temperature (4°C) in a wide range of salinities from 5 to 250 g/L of NaCl, the latter being 3 times higher than the natural salt concentration of the Alaskan cryopeg. The microorganisms identified are comprised of four major phyla: Actinobacteria (genera Brevibacterium, Citricoccus, Microbacterium), Firmicutes (genus Paenibacillus), Bacteroidetes (genus Sphingobacterium), and Proteobacteria (genus Ochrobactrum).
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Sobre autores
E. Spirina
Institute of Physicochemical and Biological Problems of Soil Science
Autor responsável pela correspondência
Email: El.Spirina@gmail.com
Rússia, Pushchino, 142290
E. Durdenko
Institute of Physicochemical and Biological Problems of Soil Science
Email: El.Spirina@gmail.com
Rússia, Pushchino, 142290
N. Demidov
Institute of Physicochemical and Biological Problems of Soil Science
Email: El.Spirina@gmail.com
Rússia, Pushchino, 142290
A. Abramov
Institute of Physicochemical and Biological Problems of Soil Science
Email: El.Spirina@gmail.com
Rússia, Pushchino, 142290
V. Romanovsky
Geophysical Institute
Email: El.Spirina@gmail.com
Estados Unidos da América, 903 N Koyukuk Dr, Fairbanks, AK, 99709
E. Rivkina
Institute of Physicochemical and Biological Problems of Soil Science
Email: El.Spirina@gmail.com
Rússia, Pushchino, 142290