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Thrive or survive: prokaryotic life in hypersaline soils
Blanca Vera-Gargallo1,2, Marcela Hernández3, Marc G Dumont4
1Department of Microbiology and Parasitology, Faculty of Pharmacy, University of Sevilla, 41012, Sevilla, Spain.
Environmental Microbiome
|March 14, 2023
Summary
Microbial life in hypersaline soils is dominated by extremophiles like haloarchaea, which efficiently adapt to high salt. Light, however, hindered bacterial growth and reduced archaeal diversity in these challenging environments.
Area of Science:
- Microbiology
- Environmental Science
- Soil Science
Background:
- Soil microorganisms drive essential planetary functions.
- Increasing soil salinity due to climate change impacts vast land areas.
- Understanding microbial dynamics in hypersaline soils is crucial but limited.
Purpose of the Study:
- To identify microbial taxa capable of growth in hypersaline soils.
- To investigate the influence of light on prokaryotic growth in these habitats.
Main Methods:
- DNA stable-isotope probing (DNA-SIP) using 18O-water.
- Incubation of hypersaline soil samples (ECe = 97.02 dS/m).
- Evaluation of prokaryotic responses to light exposure.
Main Results:
- Both archaea and bacteria grew, with extremophiles like haloarchaea and Salinibacter dominating.
- Moderately halophilic and halotolerant bacteria also grew but incorporated less isotope.
- Light inhibited most bacterial growth and reduced archaeal diversity, without stimulating photosynthesis.
Conclusions:
- Life in saline soils is energetically demanding; heterogeneity and traits like exopolysaccharide production may be key.
- The role of phototrophy in supporting heterotrophic communities in saline soils requires further investigation.
- This research enhances understanding of hypersaline soil functioning and microbial community responses to salinity.
Keywords:
Amplicon sequencingHypersaline environmentsProkaryotic communitiesSaline soilStable isotope probingMore Related Videos
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