1887

Abstract

A novel chemo-organoheterotroph bacterium, strain CB-286315, was isolated from a Mediterranean forest soil sampled at the Sierra de Tejeda, Almijara and Alhama Natural Park, Spain, by using the diffusion sandwich system, a device with 384 miniature diffusion chambers. 16S rRNA gene sequence analyses identified the isolate as a member of the under-represented phylum , where ‘’ KBS708, T-27 and AP64 were the closest relatives, with respective similarities of 84.4, 83.6 and 83.3 %. Strain CB-286315 was characterized as a Gram-negative, non-motile, short to long rod-shaped bacterium. Occasionally, some cells attained an unusual length, up to 35–40 μm. The strain showed positive responses for catalase and cytochrome- oxidase and division by binary fission, and exhibited an aerobic metabolism, showing optimal growth under normal atmospheric conditions. Strain CB-286315 was also able to grow under micro-oxic atmospheres, but not under anoxic conditions. The strain is a slowly growing bacterium able to grow under low nutrient concentrations. Major fatty acids included iso-Cω9, summed feature 3 (Cω7 and/or iso-C 2-OH), C and iso-C. The major polar lipids were phosphatidylglycerol, phosphatidylethanolamine, phosphatidylcholine, two unidentified glycolipids and three phospholipids. The major isoprenoid quinone was MK-8 and the diagnostic diamino acid was -diaminopimelic acid. The DNA G+C content was 67.0 mol%. Based on a polyphasic taxonomic characterization, strain CB-286315 represents a novel genus and species, gen. nov., sp. nov., within the phylum . The type strain of is strain CB-286315 ( = DSM 29007 = CECT 8660). In order to classify the novel taxon within the existing taxonomic framework, the family fam. nov., order ord. nov. and class classis nov. are also proposed.

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2016-05-01
2024-03-19
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