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Marinobacterium rhizophilum sp. nov., isolated from the rhizosphere of the coastal tidal-flat plant Suaeda japonica

School of Earth and Environmental Sciences and Research Institute of Oceanography, Seoul National University, San 56-1 Shillim-dong, Kwanak-gu, Seoul 151-742, Republic of Korea

Correspondence
Byung Cheol Cho
bccho{at}snu.ac.kr

A Gram-negative, strictly aerobic, marine bacterium, designated strain CL-YJ9^T, was isolated from sediment closely associated with the roots of a plant (Suaeda japonica) inhabiting a coastal tidal flat. Cells of the novel strain were straight and rod-shaped and were motile by means of monopolar flagella. A phylogenetic analysis based on 16S rRNA gene sequences revealed that strain CL-YJ9^T belongs to the genus Marinobacterium and was most closely related to Marinobacterium halophilum mano11^T (94.1 % sequence similarity) and to other members of the genus Marinobacterium (92.5–93.7 % sequence similarity). The strain grew with 1–5 % NaCl (optimum, 3 %) and at 5–30 °C (optimum, approx. 25 °C) and pH 6.0–9.0 (optimum, pH 7.0). The predominant cellular fatty acids were summed feature 3 (C_{16 : 1}7c and/or iso-C_{15 : 0} 2-OH, 40.3 %), C_{18 : 1}7c (26.6 %), C_{16 : 0} (16.6 %) and C_{10 : 0} 3-OH (7.1 %). The major isoprenoid quinone was Q-8. The G+C content of the genomic DNA was 61 mol%. On the basis of the data from this polyphasic study, strain CL-YJ9^T belongs to the genus Marinobacterium but is distinguishable from the recognized species. Strain CL-YJ9^T therefore represents a novel species, for which the name Marinobacterium rhizophilum sp. nov. is proposed. The type strain is CL-YJ9^T (=KCCM 42386^T =DSM 18822^T).

The cellular fatty acid compositions of strain CL-YJ9^T and type strains of Marinobacterium species are available as supplementary material with the online version of this paper.

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