Algoriphagus resistens sp. nov., isolated from marine sediment

Strain NH1^T, a pink-pigmented, facultatively anaerobic, heterotrophic, catalase-positive and oxidase-negative, Gram-stainnegative marine bacterium, was isolated from marine sediment on the coast of Weihai, China. Cells of strain NH1^T were rodshaped, 0.8–2.0μm in length and 0.5–1.0μm in width. The strain was able to grow at 13–37 °C, pH 5.5–8.5, in the presence of 0.0–8.0% (w/v) NaCl. Optimal growth was observed at 28 °C, with 3.0% (w/v) NaCl and pH 6.5–7.0. Nitrate was reduced. The G+C content of the DNA was 41.9 mol%. The major isoprenoid quinone was MK-7 and the main cellular fatty acids (>10%) were summed feature 3 (33.6%) comprising iso-C_{15: 0} 2-OH and/or C_{16: 1}ω7c, and iso-C_15:0 (19.2%). The major polar lipids in strain NH1^T were phosphatidylethanolamine, unidentified lipids, phospholipid and aminolipids. Phylogenetic analysis based on 16S rRNA gene sequences revealed that strain NH1^T was highly related to the type strains of Algoriphagus antarcticus (97.87% 16SrRNA gene sequence similarity) and Algoriphagus ratkowskyi (97.56%). On basis of the phenotypic and phylogenetic data, strain NH1^T should be classified as representing a novel species of the genus Algoriphagus, for which the name Algoriphagus resistens sp. nov. is proposed. The type strain is NH1^T (=MCCC 1H00140^T=KCTC 52228^T).