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Culturing the desert microbiota.

Zakia Selmani1,2, Eleonore Attard3, Béatrice Lauga3

  • 1Laboratoire de Biologie et Physiologie des Organismes, Faculté des Sciences Biologiques, University of Science and Technology Houari Boumediene (USTHB), Algiers, Algeria.

Frontiers in Microbiology
|April 28, 2023
PubMed
Summary
This summary is machine-generated.

This study introduces an improved grain-by-grain culture method to isolate desert sand bacteria. The method successfully cultivated diverse bacteria, including dominant species like Arthrobacter, aiding future desiccation tolerance research.

Keywords:
Saharaculturabilitydesertdiversitymicrobiota

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Area of Science:

  • Microbiology
  • Desert Ecology
  • Genomics

Background:

  • Culture-independent methods (metabarcoding, metagenomics) dominate microbial diversity studies.
  • Culture-dependent methods are essential for isolating and characterizing specific strains.
  • Desert environments harbor unique microbial communities with potential for novel discoveries.

Purpose of the Study:

  • To improve a culture-dependent method for isolating bacteria from desert sand.
  • To characterize the diversity of culturable bacteria from the Great Western Erg, Algeria.
  • To compare culture-dependent and -independent approaches for microbial diversity assessment.

Main Methods:

  • Developed and applied an improved "grain-by-grain" culture method for isolating bacteria from sand samples.
  • Utilized 16S rRNA gene sequencing to identify and analyze the diversity of 290 bacterial isolates.
  • Employed 16S rRNA gene metabarcoding for comparison with culture-dependent findings.

Main Results:

  • The "grain-by-grain" method successfully cultivated up to 10% of bacteria from desert sand grains.
  • Identified dominant bacterial species including Arthrobacter subterraneus, Arthrobacter tecti, Pseudarthrobacter phenanthrenivorans, Pseudarthrobacter psychrotolerans, and Massilia agri.
  • Found 18 common bacterial genera between culture-dependent and -independent methods, noting differential genus representation.

Conclusions:

  • The improved culture method is effective for isolating desert bacteria.
  • Bacterial culturing provides valuable insights into microbial communities, complementing culture-independent techniques.
  • Cultured isolates, particularly Pseudomonadota, offer opportunities to study desiccation tolerance mechanisms.