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Stress-Tolerance and Taxonomy of Culturable Bacterial Communities Isolated from a Central Mojave Desert Soil Sample

1
Soil Science Faculty, Lomonosov Moscow State University, Moscow 119991, Russia
2
Space Research Institute, Russian Academy of Sciences, Moscow 119991, Russia
*
Author to whom correspondence should be addressed.
Geosciences 2019, 9(4), 166; https://doi.org/10.3390/geosciences9040166
Received: 28 February 2019 / Revised: 3 April 2019 / Accepted: 8 April 2019 / Published: 10 April 2019
(This article belongs to the Special Issue Planetary Evolution and Search for Life on Habitable Planets)
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Abstract

The arid Mojave Desert is one of the most significant terrestrial analogue objects for astrobiological research due to its genesis, mineralogy, and climate. However, the knowledge of culturable bacterial communities found in this extreme ecotope’s soil is yet insufficient. Therefore, our research has been aimed to fulfil this lack of knowledge and improve the understanding of functioning of edaphic bacterial communities of the Central Mojave Desert soil. We characterized aerobic heterotrophic soil bacterial communities of the central region of the Mojave Desert. A high total number of prokaryotic cells and a high proportion of culturable forms in the soil studied were observed. Prevalence of Actinobacteria, Proteobacteria, and Firmicutes was discovered. The dominance of pigmented strains in culturable communities and high proportion of thermotolerant and pH-tolerant bacteria were detected. Resistance to a number of salts, including the ones found in Martian regolith, as well as antibiotic resistance, were also estimated. View Full-Text
Keywords: physiology of bacteria; extremotolerance; antibiotic resistance; soil; microbial communities; Mars analogue site physiology of bacteria; extremotolerance; antibiotic resistance; soil; microbial communities; Mars analogue site
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Belov, A.A.; Cheptsov, V.S.; Vorobyova, E.A.; Manucharova, N.A.; Ezhelev, Z.S. Stress-Tolerance and Taxonomy of Culturable Bacterial Communities Isolated from a Central Mojave Desert Soil Sample. Geosciences 2019, 9, 166.

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