Evaluation of matrix-assisted laser desorption ionization-time of flight whole cell profiles for assessing the cultivable diversity of aerobic and moderately halophilic prokaryotes thriving in solar saltern sediments |
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Authors: | Munoz Raul López-López Arantxa Urdiain Mercedes Moore Edward R B Rosselló-Móra Ramon |
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Affiliation: | a Marine Microbiology Group, Department of Ecology and Marine Resources, Institut Mediterrani d’Estudis Avançats (CSIC-UIB), E-07190 Esporles, Mallorca, Illes Balears, Spain b Culture Collection University of Gothenburg (CCUG), Department of Clinical Bacteriology, Sahlgrenska University Hospital, SE-40234 Gothenburg, Sweden c Department of Infectious Disease, Sahlgrenska Academy of the University of Gothenburg, P.O. Box 7193, SE-40234 Gothenburg, Sweden |
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Abstract: | The moderately halophilic, cultivable fraction of prokaryotes thriving in hypersaline sediments of a solar saltern in Mallorca, Spain, has been studied by means of different cultivation media. A set of 374 isolates retrieved with six different culture conditions was screened, using whole-cell MALDI-TOF MS analysis to classify them into 25 phenotypic clusters at 52% similarity. The phylogenetic inference, made from comparative sequence analyses of the 16S rRNA genes of selected strains, indicated that each phenotypic cluster was comprised of a genealogically homogeneous set of strains. DNA-DNA hybridization (DDH) results among selected strains confirmed that each MALDI-TOF cluster encompassed members of the same species. On the other hand, the intra-cluster diversity, measured by several RAPD (Random Amplified Polymorphic DNA) amplifications, indicated that the clusters corresponded to several populations of the same phylogenetic unit coexisting in the same environment. The results encourage the use of MALDI-TOF MS for further exhaustive studies of the cultivable diversity of hypersaline environments. |
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Keywords: | MALDI-TOF MS Taxonomy Diversity Cultivation Species RAPD |
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