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Abstract

In an ongoing attempt to analyse the diversity of culturable micro-organisms from oil-contaminated soil, two yellow-pigmented, Gram-negative, halophilic bacterial strains (SM16 and SM117) were isolated. These two strains were characterized using a polyphasic approach. Strains SM16 and SM117 showed a range of phenotypic and chemotaxonomic properties that were consistent with those of members of the genus . Both strains contained sphingoglycolipids, thus confirming that they belong to the . Furthermore, the polar lipid profile consisted of phosphatidylglycerol, phosphatidyldimethylethanolamine and phosphatidylethanolamine, with minor amounts of phosphatidyldimethylethanolamine, phosphatidylcholine and phosphatidylmonomethylethanolamine. Spermidine was the major polyamine in the cell wall, a characteristic feature of members of the genus . Fatty acid analysis revealed the presence of C 7, C and C 2-OH in both isolates, a characteristic feature of sphingomonads. 16S rRNA gene sequence similarities with the type strains of the most closely related species of the genus ( and ) were less than 98.8 % for both strains. Phylogenetic analysis based on 16S rRNA gene sequences indicated that strains SM16 and SM117 fall in the clade represented by the genus . Strains SM16 and SM117 shared 98.8 % similarity in their 16S rRNA gene sequences and their mean level of DNA–DNA relatedness was 8.5 %. Strains SM16 and SM117 differed from each other with respect to their morphological, physiological and chemotaxonomic properties. Thus, these results indicate that strains SM16 and SM117 belong to separate species of the genus , for which the names sp. nov. and sp. nov. are proposed; the type strains are SM16 (=CCM 7472 =MTCC9019) and SM117 (=CCM 7473 =MTCC9020), respectively.

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2009-01-01
2024-03-28
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Transmission electron micrographs of negatively stained cells of strains SM16 (left) and SM117 (right). Strain SM117 shows a single polar flagellum. Bars, 1.0 µm.

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Transmission electron micrographs of negatively stained cells of strains SM16 (left) and SM117 (right). Strain SM117 shows a single polar flagellum. Bars, 1.0 µm.

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Polar lipid profiles of strains SM16 (left) and SM117 (right) after two-dimensional TLC and detection with molybdatophosphoric acid. PE, Phosphatidylethanolamine; PG, phosphatidylglycerol; DPG, diphosphatidylglycerol; PC, phosphatidylcholine; SGL, sphingoglycolipid; PDE, phosphatidyldimethylethanolamine; PME, phosphatidylmonomethylethanolamine; PDE, phosphatidyldimethylethanolamine; PL , unknown phospholipid; PGL , unknown phosphoglycolipid; GL , unknown glycolipid: P, unknown polar lipid.

IMAGE

Polar lipid profiles of strains SM16 (left) and SM117 (right) after two-dimensional TLC and detection with molybdatophosphoric acid. PE, Phosphatidylethanolamine; PG, phosphatidylglycerol; DPG, diphosphatidylglycerol; PC, phosphatidylcholine; SGL, sphingoglycolipid; PDE, phosphatidyldimethylethanolamine; PME, phosphatidylmonomethylethanolamine; PDE, phosphatidyldimethylethanolamine; PL , unknown phospholipid; PGL , unknown phosphoglycolipid; GL , unknown glycolipid: P, unknown polar lipid.

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