title: Desulfosporosinus meridiei sp. nov., a spore-forming sulfate-reducing bacterium isolated from gasolene-contaminated groundwater.
abstract: Eight strains of spore-forming, sulfate-reducing bacteria, isolated from groundwater contaminated with motor fuel [mostly benzene, toluene ethylbenzene and xylene (BTEX) compounds] in sandy soil near Perth, Australia, were closely related to Desulfosporosinus (previously Desulfotomaculum) orientis DSM 765T (95.3-97.3% 16S rDNA sequence similarity). Whole-cell fatty acids were dominated by even-carbon, straight-chain saturated and mono-unsaturated fatty acids, in particular 16:0, 16:1cis9, 14:0 and 18:1cis11. The strains grew at temperatures between 4 and 42 degrees C and in medium containing up to 4% NaCl. The eight strains clustered into two main groups based on phylogeny, randomly amplified polymorphic DNA (RAPD)-PCR patterns and nutritional characteristics. Representatives of the two groups, strain S5 (group A) and strain S10T (group B) had 81% DNA-DNA homology with each other and therefore should be accommodated in the same species. Strain S10T had less than 38% homology with Desulfosporosinus orientis DSM 765T, the most closely phylogenetically related type strain available. The new strains were distinguished from Desulfosporosinus orientis DSM 765T by different banding patterns in a RAPD-PCR, and phenotypically by their inability to utilize fumarate as a carbon and energy source with sulfate as the electron acceptor and by their lower tolerance to NaCl. The DNA G+C contents were 46.8 and 46.9 mol% for strains S5 and S10T, respectively (Desulfosporosinus orientis DSM 765T 45.9 mol%). It is proposed that these new strains be placed in a new species of the genus Desulfosporosinus. The name Desulfosporosinus meridiei is proposed, with strain S10T as the type strain (= DSM 13257T = NCIMB 13706T).
authors.affiliation: Centre for Groundwater Studies, CSIRO Land and Water, Floreat Park, WA, Australia. wendyr@per.clw.csiro.au
authors.forename: W J
authors.initials: WJ
authors.lastname: Robertson
authors.forename: J P
authors.initials: JP
authors.lastname: Bowman
authors.forename: P D
authors.initials: PD
authors.lastname: Franzmann
authors.forename: B J
authors.initials: BJ
authors.lastname: Mee
mesh_terms: D015373:Bacterial Typing Techniques; D001482:Base Composition; D002244:Carbon / Q000378:metabolism; D003470:Culture Media / Q000737:chemistry; D004269:DNA, Bacterial / Q000737:chemistry / Q000235:genetics; D005227:Fatty Acids / Q000032:analysis; D005742:Gasoline; D009693:Nucleic Acid Hybridization / Q000379:methods; D010084:Oxidation-Reduction; D010802:Phylogeny; D016133:Polymerase Chain Reaction; D019105:Random Amplified Polymorphic DNA Technique; D012965:Sodium Chloride / Q000494:pharmacology; D013171:Spores, Bacterial / Q000502:physiology*; D013431:Sulfates / Q000378:metabolism; D016999:Sulfur-Reducing Bacteria / Q000145:classification* / Q000302:isolation & purification / Q000502:physiology; D013696:Temperature; D014871:Water Microbiology; D014877:Water Pollution, Chemical
chemical_list: D003470:Culture Media; D004269:DNA, Bacterial; D005227:Fatty Acids; D005742:Gasoline; D013431:Sulfates; D012965:Sodium Chloride; D002244:Carbon