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1 Division of Applied Life Science (BK 21), PMBBRC and EB-NCRC, Gyeongsang National University, Jinju 660-701, Republic of Korea
2 Department of Life Science, Chung-Ang University, Seoul 156-756, Republic of Korea
Correspondence
Young Ryun Chung
yrchung{at}gnu.ac.kr
The taxonomic position of a novel bacterial strain, YC6269T, isolated from the rhizosphere of rice (Oryza sativa L.) managed under no-tillage practice in Jinju, South Korea, was studied using polyphasic approach. Cells of the strain were Gram-negative, rod-shaped and facultatively anaerobic. The novel strain grew at a temperature of 15–42 °C (optimum at 28 °C). Growth of the strain occurred between pH 5.5 and 11.0, with an optimum at pH 7.0–8.0. The G+C content of the total DNA was 67.4 mol%. The 16S rRNA gene sequence of the strain was most closely related to species of the genus Lysobacter, Lysobacter yangpyeongensis DSM 17635T (98.6 %), Lysobacter niabensis GH34-4T (97.2 %), Lysobacter enzymogenes DSM 2043T (96.9 %), Lysobacter daejeonensis DSM 17634T (96.3 %) and Lysobacter niastensis GH41-7T (96.2 %). The novel strain showed <96.0 % similarity with other species of the genus Lysobacter. Chemotaxonomic data (major quinone, Q-8; major polar lipids, phosphatidylethanolamine, phosphatidylglycerol and phosphatidyl-N-methylethanolamine, and major fatty acids, C15 : 0 iso, C16 : 0 iso, C17 : 0 iso and C17 : 1 iso
9c) supported the affiliation of strain YC6269T to the genus Lysobacter. Phylogenetic analysis based on the 16S rRNA gene sequences, DNA–DNA hybridization data and biochemical and physiological characteristics strongly supported the genotypic and phenotypic differentiation of strain YC6269T from recognized species of the genus Lysobacter. Strain YC6269T, therefore, represents a novel member of the genus Lysobacter, for which the name Lysobacter oryzae sp. nov. is proposed. The type strain is YC6269T (=KCTC 22249T=DSM 21044T).
A transmission electron micrograph of cells of strain YC6269T and the TLC polar lipid analysis are available as supplementary figures with the online version of this paper. Additional tables detailing the enzymic activities of the novel strain and the fatty acid profile are also available.
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