Halophilic-psychrotrophic bacteria of an Alaskan cryopeg—a model for astrobiology


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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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E. Spirina

Institute of Physicochemical and Biological Problems of Soil Science

编辑信件的主要联系方式.
Email: El.Spirina@gmail.com
俄罗斯联邦, Pushchino, 142290

E. Durdenko

Institute of Physicochemical and Biological Problems of Soil Science

Email: El.Spirina@gmail.com
俄罗斯联邦, Pushchino, 142290

N. Demidov

Institute of Physicochemical and Biological Problems of Soil Science

Email: El.Spirina@gmail.com
俄罗斯联邦, Pushchino, 142290

A. Abramov

Institute of Physicochemical and Biological Problems of Soil Science

Email: El.Spirina@gmail.com
俄罗斯联邦, Pushchino, 142290

V. Romanovsky

Geophysical Institute

Email: El.Spirina@gmail.com
美国, 903 N Koyukuk Dr, Fairbanks, AK, 99709

E. Rivkina

Institute of Physicochemical and Biological Problems of Soil Science

Email: El.Spirina@gmail.com
俄罗斯联邦, Pushchino, 142290

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