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Lysobacter capsici sp. nov., with antimicrobial activity, isolated from the rhizosphere of pepper, and emended description of the genus Lysobacter

Division of Applied Life Science (BK 21), PMBBRC and EB-NCRC, Gyeongsang National University, Jinju 660-701, Republic of Korea

Correspondence
Young Ryun Chung
yrchung{at}gnu.ac.kr

The taxonomic position of a novel bacterial strain, YC5194^T, with antimicrobial activity, isolated from the rhizosphere of pepper in Jinju, South Korea, was studied using a polyphasic approach. Cells of the strain were Gram-negative, rod-shaped, facultative anaerobes. It grew at a temperature of 15–37 °C (optimum 28 °C). Growth of the strain occurred between pH 5.5 and 8.5, with an optimum of pH 7.0–7.5. The strain inhibited mycelial growth of Pythium ultimum, Colletotrichum gloeosporioides, Fusarium oxysporum, Botrytis cinerea, Rhizoctonia solani and Botryosphaeria dothidea and growth of Bacillus subtilis. The G+C content of the total DNA was 65.4 mol%. The 16S rRNA gene sequence of the strain was most closely related to species of the genus Lysobacter (<94.0 to >99.0 % sequence similarity). Chemotaxonomic data (major quinone, Q-8; major polar lipids, diphosphatidylglycerol, phosphatidylethanolamine, phosphatidylglycerol and phosphatidyl-N-methylethanolamine; major fatty acids, iso-C_{15 : 0}, summed feature 3, C_{16 : 0}, iso-C_{17 : 1}9c and C_{18 : 1}7c) supported the affiliation of strain YC5194^T to the genus Lysobacter. Phylogenetic analysis based on 16S rRNA gene sequences, DNA–DNA hybridization data and biochemical and physiological characteristics strongly supported the genotypic and phenotypic differentiation of strain YC5194^T from species of Lysobacter with validly published names. Strain YC5194^T therefore represents a novel species, for which the name Lysobacter capsici sp. nov. is proposed. The type strain is YC5194^T (=KCTC 22007^T =DSM 19286^T).

Transmission electron micrographs of cells of strain YC5194^T, TLC of polar lipids of two related type strains, fatty acid profiles and API ZYM results for strain YC5194^T and related type strains and a detailed antimicrobial spectrum for strain YC5194^T are available as supplementary material with the online version of this paper.