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A Gram-staining-positive actinobacterial strain, Chem10(T), was isolated from soil around Inche-Broun hypersaline wetland in the north of Iran. Strain Chem10(T) was strictly aerobic, and catalase- and oxidase-positive. The isolate grew with 0-3 % NaCl, at 20-40 °C and at pH 6.0-8.0. The optimum temperature and pH for growth were 30 °C and pH 7.0, respectively. The cell wall of strain Chem10(T) contained meso-diaminopimelic acid as diamino acid and galactose, ribose and arabinose as whole-cell sugars. The polar lipid pattern contained diphosphatidylglycerol, phosphatidylglycerol and phosphatidylethanolamine. Strain Chem10(T) synthesized cellular fatty acids of the straight-chain saturated and mono-unsaturated, and iso- and anteiso-branched types C14 : 0, C16 : 0, iso-C16 : 1, anteiso-C17 : 0, iso-C16 : 0, iso-C14 : 0 and iso-C15 : 0, and the major respiratory quinone was MK-9(H4). The G+C content of the genomic DNA was 70.7 mol%. Phylogenetic analysis based on 16S rRNA gene sequences revealed that strain Chem10(T) belonged to the family Pseudonocardiaceae and showed the closest phylogenetic similarity to Alloactinosynnema album KCTC 19294(T) (98.3 %) and Actinokineospora cibodasensis DSM 45658(T) (97.9 %). DNA-DNA relatedness values between the novel strain and strains Alloactinosynnema album KCTC 19294(T) and Actinokineospora cibodasensis DSM 45658(T) were only 52 % and 23 %, respectively. On the basis of phylogenetic analysis, phenotypic characteristics and DNA-DNA hybridization data, a novel species of the genus Alloactinosynnema is proposed, Alloactinosynnema iranicum sp. nov. The type strain is Chem10(T) ( = IBRC-M 10403(T) = CECT 8209(T)). In addition, an emended description of the genus Alloactinosynnema is proposed.

Alloactinosynnema iranicum sp. nov., a rare actinomycete isolated from a hypersaline wetland, and emended description of the genus Alloactinosynnema