Extremophiles

, Volume 19, Issue 2, pp 525–537 | Cite as

Culturable diversity of aerobic halophilic archaea (Fam. Halobacteriaceae) from hypersaline, meromictic Transylvanian lakes

  • Andreea Baricz
  • Adorján Cristea
  • Vasile Muntean
  • Gabriela Teodosiu
  • Adrian-Ştefan Andrei
  • Imola Molnár
  • Mircea Alexe
  • Elena Rakosy-Tican
  • Horia Leonard Banciu
Original Paper

Abstract

Perennially stratified salt lakes situated in the Transylvanian Basin (Central Romania) were surveyed for the diversity of culturable halophilic archaea (Fam. Halobacteriaceae). The physical and chemical characteristics of the waters indicated that all the investigated lakes were meromictic and neutral hypersaline. Samples collected from upper, intermediate, and deeper water layers and sediments were used for the isolation of halophilic strains followed by 16S rRNA gene-based identification and phenotypic characterization. The phylogenetic analysis of the 16S rRNA gene sequences revealed that all 191 isolates reported in this study and 43 strains previously isolated were affiliated with the family Halobacteriaceae and classified to 18 genera. Haloferax was the most frequently isolated genus (~47 %), followed by Halobacterium spp. (~12 %), and Halorubrum spp. (~11 %). Highest culturable diversity was detected in Brâncoveanu Lake, the oldest and saltiest of all studied lakes, while the opposite was observed in the most stable and least human-impacted Fără Fund Lake. One strain from Ursu Lake might possibly constitute a novel Halorubrum species as shown by phylogenetic analysis. Several haloarchaeal taxa recently described in Asian (i.e., Iran, China) saline systems were also identified as inhabiting the Transylvanian salt lakes thus expanding our knowledege on the geographic distribution of Halobacteriaceae.

Keywords

Culturable haloarchaea Genus-level diversity Haloferax spp. Meromictic lake Site-specific diversity 

Supplementary material

792_2015_738_MOESM1_ESM.doc (202 kb)
Supplementary material 1 (DOC 202 kb)

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Copyright information

© Springer Japan 2015

Authors and Affiliations

  • Andreea Baricz
    • 1
    • 2
  • Adorján Cristea
    • 1
  • Vasile Muntean
    • 1
  • Gabriela Teodosiu
    • 3
  • Adrian-Ştefan Andrei
    • 1
    • 4
  • Imola Molnár
    • 1
  • Mircea Alexe
    • 5
  • Elena Rakosy-Tican
    • 1
  • Horia Leonard Banciu
    • 1
    • 4
  1. 1.Department of Molecular Biology and Biotechnology, Faculty of Biology and GeologyBabeş-Bolyai UniversityCluj-NapocaRomania
  2. 2.National Institute of Research and Development for Biological Sciences (NIRDBS)Institute of Biological ResearchCluj-NapocaRomania
  3. 3.Institute of Biology Bucharest of the Romanian AcademyBucharestRomania
  4. 4.Institute for Interdisciplinary Research in Bio-Nano-Sciences, Molecular Biology CenterBabeş-Bolyai UniversityCluj-NapocaRomania
  5. 5.Faculty of GeographyBabeş-Bolyai UniversityCluj-NapocaRomania

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