Mesonia aquimarina sp. nov., a marine bacterium isolated from coastal seawater

Abstract

A Gram-staining-negative, aerobic, yellow, non-flagellated, non-gliding, rod-shaped bacterium, designated strain IMCC1021T, was isolated off the coast of the East Sea. Optimal growth of strain IMCC1021T was observed at 25 °C, pH 7.0–7.5 and in the presence of 3.0–3.5 % (w/v) NaCl. Phylogenetic analysis based on 16S rRNA gene sequences revealed that the strain belonged to the genus Mesonia , showing a close relationship with Mesonia mobilis KMM 6059T (97.4 % similarity) followed by Mesonia phycicola MDSW-25T (96.1 %). DNA–DNA relatedness between strain IMCC1021T and M. mobilis KMM 6059T was 17.5 % (reciprocal 7.4 %), which indicated that the new isolate represents a novel genomic species of the genus Mesonia . The major fatty acids were iso-C15 : 0 and iso-C17 : 0 3-OH, and the G+C content of the genomic DNA was 41.4 mol%. Strain IMCC1021T contained menaquinone-6 (MK-6) as the respiratory quinone, and polar lipids comprising phosphatidylethanolamine, two unknown aminolipids and three unknown polar lipids. On the basis of the phylogenetic distinctions and differential phenotypic characteristics, it is suggested that strain IMCC1021T ( = KCTC 32320T = NBRC 109485T) should be assigned to the genus Mesonia as the type strain of a novel species, for which the name Mesonia aquimarina sp. nov. is proposed.