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Cyclobacterium sediminis sp. nov. isolated from a sea cucumber aquaculture farm and emended description of the genus Cyclobacterium
Seyeon Shin 1, Hyung-Yeel Kahng 1,2
Journal of Microbiology 2017;55(2):90-95.
DOI: https://doi.org/10.1007/s12275-017-6484-6
Published online: January 26, 2017
1Department of Environmental Education, Sunchon National University, Suncheon 57922, Republic of Korea, 2Research Institute for Sanitation and Environment of Coastal Areas, Sunchon National University, Suncheon 57922, Republic of Korea1Department of Environmental Education, Sunchon National University, Suncheon 57922, Republic of Korea, 2Research Institute for Sanitation and Environment of Coastal Areas, Sunchon National University, Suncheon 57922, Republic of Korea
Corresponding author:  Hyung-Yeel Kahng , Tel: +82-61-750-3385, 
Received: 26 September 2016   • Revised: 5 December 2016   • Accepted: 6 December 2016
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Abstract

An aerobic, Gram-negative bacterium, designated strain SD70T, was isolated from sea cucumber aquaculture farm sediment in Taean, Korea, and its taxonomic status was established by undertaking a polyphasic study. Cells of strain SD70T were non-motile, catalase-, and oxidase-positive, nonspore- forming, and horseshoe-shaped. Optimal growth was observed under 25–30°C, pH 7.0–8.0, and 3.0–5.0% (w/v) NaCl conditions. Phylogenetic analyses based on 16S rRNA gene sequences revealed that strain SD70T fell within an evolutionary group comprising species of the genus Cyclobacterium. Strain SD70T shared 92.1–98.5% 16S rRNA sequence similarity values with the type strains of species of the genus Cyclobacterium. Relatively low levels of DNA-DNA relatedness were found between strain SD70T and C. marinum DSM 745T (40.2%) and C. amurskyense KMM 6143T (15.8%). The predominant cellular fatty acids were iso-C15:0 (32.1%), and anteiso-C15:0 (9.1%). Menaquinone MK-7 was the only respiratory quinone. The G+C content of the genomic DNA was 36 mol%. The polar lipids were phosphatidylcholine, phosphatidylethanolamine, phosphatidylglycerol, and seven unidentified lipids. On the basis of phenotypic and genotypic data, strain SD70T represents a novel species of the genus Cyclobacterium, for which the name Cyclobacterium sediminis sp. nov. is proposed. An emended description of the genus Cyclobacterium is also provided.

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    Cyclobacterium sediminis sp. nov. isolated from a sea cucumber aquaculture farm and emended description of the genus Cyclobacterium
    J. Microbiol. 2017;55(2):90-95.   Published online January 26, 2017
    DOI: https://doi.org/10.1007/s12275-017-6484-6
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