Cited by 25Polar Research and EcologyMicrobial Community Ecology and PhysiologyGenomics and Phylogenetic Studies

Insights into the microbiology of the chaotropic brines of Salar de Atacama, Chile

Open access
Cubillos, Carolina F., Paredes, Adrián, Yáñez, Carolina, Palma, Jenifer, Severino, Esteban, Vejar, Drina, Grágeda, Mario, Dorador, Cristina·2019·Frontiers in Microbiology

Abstract

Microbial life inhabiting hypersaline environments belong to a limited group of extremophile or extremotolerant taxa. Natural or artificial hypersaline environments are not limited to high concentrations of NaCl, and under such conditions, specific adaptation mechanisms are necessary to permit microbial survival and growth. Argentina, Bolivia and Chile include three large salars (salt flats) which are represent the largest lithium reserves globally, and that are commonly referred to as the Lithium Triangle zone. To date, a large amount of information has been generated regarding chemical, geological, meteorological and economical perspectives of these salars. However, there is a remarkable lack of information regarding the biology of these unique environments. Here we report the presence of two bacterial strains from one of most hypersaline lithium-dominated man-made environments (55.6%) reported to date. Both isolates were classified to the Bacillus genera, but displayed differences in 16S rRNA gene and fatty acid profiles. Our results also revealed that isolates are lithium-tolerant and that they are phylogenetically differentiated to Bacillus associated with high NaCl concentration environments, and form a new clade from the “Lithium Triangle” zone. To determine osmoadaptation strategies in these microorganisms, both isolates were characterized using morphological, metabolic and physiological attributes. We suggest that our characterization of bacterial isolates from an environment highly enriched in lithium has revealed that even at such extreme salinities, scope for microbial life exists. These conditions have previously been considered such as to limit the development of life, and extends the window of life beyond high concentrations of MgCl2, as previously reported, to LiCl. Our results will support the future understanding of resistance mechanisms to saline stress beyond NaCl, and likely have value as study models for the understanding of putative extra-terrestrial (e.g. Martian) life.

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Crossref · 10.3389/fmicb.2019.01611

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  • In salt flat environments, aquifers of varying salinity are hydrodynamically interrelated, sustaining systems of lagoons, meadows and peatlands (high Andean wetlands).

    “In these environments, aquifers of varying salinity are hydrodynamically interrelated, sustaining systems of lagoons, meadows and peatlands (high Andean wetlands), some of which have been recognized as national parks, reserves and Ramsar sites (Dorador et al., 2009(Dorador et al., , 2018;;Thiel et al., 2010;Cubillos et al., 2019;Marazuela et al., 2019).”

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Research works printed but not linked: 7

  1. Cavoise A. Valley J. Wilde S. (1983). Evolutionary and geologic consequences of organic carbon fixing in the primitive anoxic ocean. Geology 11 141– 145. 10.1130/0091-7613198311<141:EAGCOO>2.0.CO;2 · DOI
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Authors
Cubillos, C. F., Paredes, A., Yáñez, C., Palma, J., Severino, E., Vejar, D., Grágeda, M., & Dorador, C.
Affiliations
  • Universidad de Antofagasta (CL)
  • Pontificia Universidad Católica de Valparaíso (CL)
Corresponding author
  • Cubillos, Carolina F.
  • Dorador, Cristina
Venue
Frontiers in Microbiology
Published
2019-07-11
Volume
10
Pages
1611-1611
ISSN
1664-302X (ISSN-L)
OpenAlex
W2960959213
Cited by
25
References
127
Citations by year
2026: 3 · 2025: 6 · 2024: 2 · 2023: 6 · 2022: 4 · 2021: 2 · 2020: 1 · 2019: 1
FWCI
1.27
Type
journal article
Language
en
Open access
Locations
  • Frontiers in Microbiology (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
Fondo Nacional de Desarrollo Científico, Tecnológico y de Innovación Tecnológica
Topics
  • Physical Sciences › Environmental Science › Ecology › Polar Research and Ecology
  • Physical Sciences › Environmental Science › Ecology › Microbial Community Ecology and Physiology
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Genomics and Phylogenetic Studies
Keywords
hypersaline brines, Salar de Atacama, lithium brines, extremophiles, Bacillus, lithium tolerance, osmoadaptation, lithium triangle, salt pans, 16S rRNA phylogeny, fatty acid composition, Mars analog, extraterrestrial life

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