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Pseudidiomarina sediminum sp. nov., a marine bacterium isolated from coastal sediments of Luoyuan Bay in China

¹ Laboratory of Microbiology, Ocean University of China, 5 Yushan Road, Qingdao 266003, PR China
² Freshwater Fisher Science Institute of Liaoning Province, 103 Weiguo Road, Liaoyang 111000, PR China
³ Laboratory of Molecular Medicine, Ocean University of China, 5 Yushan Road, Qingdao 266003, PR China

Correspondence
Yun Li
yunlisun{at}ouc.edu.cn

A strain of heterotrophic, facultatively anaerobic, marine bacterium, designated strain c121^T, was isolated from coastal sediment of Luoyuan Bay, in Fujian province, PR China. Analysis of the 16S rRNA gene sequence revealed an affiliation with the genus Pseudidiomarina; the sequence similarity between c121^T and Pseudidiomarina taiwanensis PIT1^T was 97 %. Cells of the novel strain were non-pigmented, Gram-negative rods, 0.3 µm wide and 1.2–1.8 µm long. Cells grown in broth cultures were non-motile, lacking flagella. Growth of the strain was observed at salinities ranging from 0.5 to 15 % NaCl, and the optimal concentration was about 1–8 %. The temperature range for growth was rather broad and was high for a marine bacterium: the strain grew at 13–42 °C, showed good growth at 20–40 °C and had an optimum between 30 and 40 °C. The major cellular fatty acids were iso-C_{15 : 0} (24.2 %), C_{16 : 1}7c/iso-C_{15 : 0} 2-OH (15.3 %) and iso-C_{17 : 1}9c (11.9 %). The DNA G+C content was 50.0 mol%. Phylogeny based on 16S rRNA gene sequences, together with data from phenotypic and chemotaxonomic characterization, revealed that strain c121^T could be classified within a novel species of the genus Pseudidiomarina, for which the name Pseudidiomarina sediminum sp. nov. is proposed, with the type strain c121^T (=CICC 10319^T =LMG 24046^T).

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