Loktanella marina sp. nov., isolated from seawater

A Gram-stain-negative, coccoid- or short-rod-shaped and non-motile bacterial strain, designated MDM-7^T, was isolated from seawater of the Yellow Sea, South Korea, and was subjected to a polyphasic taxonomic study. Strain MDM-7^T grew optimally at pH 7.0-8.0, at 30 °C and in the presence of 2-3 % (w/v) NaCl. The neighbour-joining phylogenetic tree based on 16S rRNA gene sequences showed that strain MDM-7^T fell within the clade comprising species of the genus Loktanella, clustering with the type strains of Loktanella vestfoldensisand Loktanella agnita, with which it exhibited 96.1 and 95.6 % similarity, respectively. 16S rRNA gene sequence similarity values between strain MDM-7^T and the type strains of other Loktanella species were 93.1-95.0 %. The DNA G+C content of strain MDM-7^T was 62.6 mol%. Strain MDM-7^T contained Q-10 as the predominant ubiquinone and summed feature 8 (C18 : 1ω7c and/ or C18 : 1ω6c) as the major fatty acid. The major polar lipids were diphosphatidylglycerol, phosphatidylcholine, phosphatidylglycerol and an unidentified aminolipid. Differential phenotypic properties, together with phylogenetic distinctiveness, demonstrated that strain MDM-7^T is distinguishable from recognized Loktanella species. On the basis of the data presented, strain MDM-7^T is considered to represent a novel species of the genus Loktanella, for which the name Loktanella marina sp. nov. is proposed. The type strain is MDM-7^T (=KCTC 42722^T=CECT 8899^T).

Paradonghicola geojensis gen. nov., sp. nov., isolated from seawater, Geoje-si, South Korea

A Gram-negative, non-motile, non-spore-forming and aerobic bacterium, designated FJ12(T), was isolated from seawater, Geoje-si, South Korea. Strain FJ12(T) was catalase and oxidase positive. Growth of strain FJ12(T) was optimally observed at 30 °C and pH 6 and grew in the presence of 0-11 % (w/v) NaCl (optimum 2-3 % NaCl). The phylogenic analysis based on 16S rRNA gene sequence of strains FJ12(T) showed the highest sequence similarity to those of Doghicola eburneus KCTC 12735(T) (95.4 %), Aestuariihabitans beolgyonensis KTCT 32324(T) (95.3 %), Sulfitobacter pontiacus KCTC 32185(T) (94.9 %), Roseisalinus antarcticus DSM 11466(T) (94.8 %) and Loktanella soesokkaensis KCTC 32425(T) (94.7 %). The major polar lipids of FJ12(T) were phosphatidylglycerol, phosphatidylethanolamine, diphosphatidylglycerol, an unidentified aminolipid and unidentified lipids. It contained Q-10 as the predominant ubiquinone, and major fatty acid is C18:1 ω7c (51.7 %), C16:0 (24.0 %). The DNA G+C content of the strain FJ12(T) was 60 mol%. Based on physiological and chemotaxonomic characteristics, strain FJ12(T) should be regarded as the type species of a novel genus in the family Rhodobacteraceae for which the name Paradonghicola geojensis sp. nov. is proposed. The type strain FJ12(T) (=KEMB 3001-336(T)=JCM 30384(T)).