Actinomarinicola tropica gen. nov. sp. nov., a new marine actinobacterium of the family Iamiaceae, isolated from South China Sea sediment environments

Abstract

A novel marine actinobacterium, strain SCSIO 58843^T, was isolated from the sediment sample collected from the South China Sea. Strain SCSIO 58843^T was Gram-stain-positive, aerobic and rod shaped. The whole-cell hydrolysis of amino acids contained dd-DAP, alanine, glutamic acid, glycine and aspartic acid. The main menaquinone was MK-9(H₈). The major fatty acids were C_{17 : 1} ω8c and C_{17 : 0}. The major phospholipids were diphosphatidylglycerol (DPG), phosphatidylinositol (PI), phospatidylcholine (PC) and phosphatidylinositolmannoside (PIM). The G+C content of the genomic DNA was 72.5 %. Phylogenetic analysis of the 16S rRNA gene sequences showed that strain SCSIO 58843^T formed a new lineage in the family Iamiaceae and had the highest similarity of 93.8 % with Iamia majanohamensis DSM 19957^T. Strain SCSIO 58843^T can be distinguished from these known genera in the family Iamiaceae by polyphasic data analyses, and represents a novel genus and novel species, for which Actinomarinicola tropica gen. nov., sp. nov is proposed with the type strain SCSIO 58843^T(=KCTC 49408^T=CGMCC 1.17503^T).

Keywords: Acidimicrobiia; Actinomarinicola tropica sp. nov; South China Sea; marine actinobacteria; polyphasic taxonomy.