Aureimonas endophytica sp. nov., a novel endophytic bacterium isolated from Aegiceras corniculatum.

A Gram-negative, motile, aerobic and coccoid rod-shaped bacterium, designated strain 2T4P-2-4T, was isolated from a piece of surface-sterilized bark of Aegiceras corniculatum collected from Cotai Ecological Zones in Macao, China, and tested by a polyphasic approach to clarify its taxonomic position. Strain 2T4P-2-4T grew optimally without NaCl at 28-30 °C, pH 7.0-8.0. The 16S rRNA gene sequence of strain 2T4P-2-4T had the highest similarity (96.2 %) to Aureimonas rubiginis CC-CFT034T. Phylogenetic analysis showed that the strain grouped with species of the genus Aureimonas. The predominant quinone system of strain 2T4P-2-4T was ubiquinone 10 (Q-10). The polar lipid profile contained diphosphatidylglycerol, phosphatidylglycerol, phosphatidylcholine, phosphatidylethanolamine, sulfoquinovosyldiacylglycerol, phosphatidylmethylethanolamine, two unidentified amino lipids, an unidentified aminophospholipid and five unidentified lipids. The predominant cellular fatty acid was C18 : 1ω7c (61.2 %). The DNA G+C content of strain 2T4P-2-4T was 69.8 mol%. Based on the phylogenetic, phenotypic and chemotaxonomic features, strain 2T4P-2-4T is a representative of a novel species of the genus Aureimonas, for which the name Aureimonas endophytica sp. nov. is proposed. The type strain of Aureimonas endophytica sp. nov. is 2T4P-2-4T (=KCTC 52217T=CGMCC 1.15367T).