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Deinococcus saudiensis sp. nov., isolated from desert.

Firasat Hussain1, Inam Ullah Khan1, Neeli Habib1

  • 1Key Laboratory of Microbial Diversity in Southwest China, Ministry of Education, Yunnan Institute of Microbiology, School of Life Science, Yunnan University, Kunming 650091, PR China.

International Journal of Systematic and Evolutionary Microbiology
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Two new bacterial strains resistant to gamma and UV radiation were discovered in Saudi Arabia's desert. These pink bacteria, named Deinococcus saudiensis, represent a novel species within the Deinococcus genus.

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Area of Science:

  • Microbiology
  • Extremophile Research
  • Bacterial Taxonomy

Background:

  • Desert environments harbor unique microorganisms with extreme resistance capabilities.
  • Radiation resistance is a key characteristic of certain bacterial genera, including Deinococcus.
  • Understanding microbial diversity in arid regions is crucial for astrobiology and biotechnology.

Purpose of the Study:

  • To isolate and characterize novel radiation-resistant bacteria from the Saudi Arabian desert.
  • To determine the taxonomic position of the isolated strains using polyphasic methods.
  • To propose a new species designation for the identified bacteria.

Main Methods:

  • Isolation of gamma- and UV-radiation-resistant bacterial strains.
  • Gram staining, aerobic cultivation, and growth condition assessments (temperature, pH, NaCl tolerance).
  • Phylogenetic analysis using 16S rRNA gene sequences, DNA-DNA hybridization, and determination of genomic DNA G+C content.

Main Results:

  • Two pink-coloured, Gram-negative, aerobic, rod-shaped bacterial strains (YIM F302T and YIM F235) were isolated.
  • Phylogenetic analysis indicated the strains belong to the genus Deinococcus, with high 16S rRNA gene similarity to Deinococcus grandis.
  • Distinct genotypic and phenotypic characteristics, including low DNA-DNA hybridization values, supported their classification as a new species.

Conclusions:

  • The isolated strains represent a novel species of the genus Deinococcus.
  • The proposed name for the new species is Deinococcus saudiensis sp. nov.
  • The type strain is YIM F302T.