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Rezumat articol ediţie STUDIA UNIVERSITATIS BABEŞ-BOLYAI
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Rezumat: Solar salterns are extreme environments in which salinity plays a very important role and influences their biodiversity. Our research group has been dedicated to the study of the inhabitants of these environments. Metagenomic studies have shown that many microorganisms that inhabit these environments have not been isolated in pure culture to date. Isolation of these new groups is the main objectives of our project. We have a wide collection of isolates from solar salterns of Isla Cristina (Huelva, Spain). This work focuses on the taxonomic description of one of these isolates, strain F13-25. Strain F13-25 forms colonies with pink pigmentation. It presents an optimal growth at a concentration of 25% (w/v) NaCl, pH 7.5 and 37oC. Phylogenetic analyses based on 16S rRNA gene sequences revealed that strain F13-25 is a member of the genus Halorientalis. We have sequenced the genome of strain F13-25 and we have analyzed it by comparing it with the genomes of the type strains of the species of the genus. The results of the GGDC and ortoANI, ANIb and ANIm of strain F13-25 and its related species showed percentages below the accepted threshold value for the delineation of prokaryotic species. It contains phosphatidylglycerol, phosphatidylglyceryl phosphate methyl ester and a glycolipid chromatographically identical to diethyl diglycosyl diether. The G + C content of the DNA is 65.7 mol% (genome). The phylogenetic, genomic, chemotaxonomic and phenotypic analyses show that strain F13-25 represents a new species of the genus Halorientalis, for which we propose the name Halorientalis pallida sp. nov.
Keywords: Archaea, genome, saltern, taxonomy. |
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