Proposal of three novel species of soil bacteria, Variovorax ureilyticus, Variovorax rhizosphaerae, and Variovorax robiniae, in the family Comamonadaceae

Tuan Manh Nguyen; Ngoc Hoang Trinh; Jaisoo Kim

doi:10.1007/s12275-018-8025-3

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Proposal of three novel species of soil bacteria, Variovorax ureilyticus, Variovorax rhizosphaerae, and Variovorax robiniae, in the family Comamonadaceae: Tuan Manh Nguyen ^1,2, Ngoc Hoang Trinh ^1,3, Jaisoo Kim ¹; Journal of Microbiology 2018;56(7):485-492.
DOI: https://doi.org/10.1007/s12275-018-8025-3
Published online: June 14, 2018

¹Department of Life Science, College of Natural Sciences and Engineering, Kyonggi University, Suwon 16227, Republic of Korea, ²Thai Nguyen University of Agriculture and Forestry, Quyet Thang Commune, Thai Nguyen City, Vietnam, ³Thai Nguyen University of Sciences, Tan Thinh Ward, Thai Nguyen City, Vietnam

Corresponding author: Jaisoo Kim , Tel: +82-31-249-9648,

Received: 18 January 2018 • Revised: 30 March 2018 • Accepted: 4 May 2018

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Abstract

Three novel bacterial strains (UCM-2T, UCM-G28T, and UCM-G35T) were obtained while isolating soil bacteria for the development of antibiotics. Cells of these strains were Gram-negative, non-spore forming, motile by means of a single flagellum, and rod shaped. In all strains, the predominant isoprenoid quinone was ubiquinone-8 (Q-8). Cells contained C16:0, summed feature 3 (C16:1 ω7c and/or C16:1 ω6c), summed feature 8 (C18:1 ω7c and/or C18:1 ω6c), and C17:0 cyclo as the major fatty acids, and C10:0 3-OH as the major hydroxy fatty acid. The polar lipid profiles of the three novel strains were dominated by diphosphatidylglycerol, phosphatidylethanolamine, and phosphatidylglycerol. The genomic DNA G + C contents of strains UCM-2T, UCM-G28T, and UCMG35T were 67.5, 65.9, and 66.4 mol%, respectively. Phylogenetic analyses based on 16S rRNA sequences showed that strain UCM-2T was most closely related to Variovorax soli NBRC 106424T, whereas strains UCM-G28T and UCM-G35T were most similar to Variovorax ginsengisoli Gsoil 3165T. Values indicating DNA-DNA hybridization between the novel isolates and closely related species in the genus Variovorax were lower than the 70% cut-off point. These phenotypic, chemotaxonomic, and phylogenetic data indicate that the three isolates should be classified as new members of the genus Variovorax, for which the names Variovorax ureilyticus sp. nov., Variovorax rhizosphaerae sp. nov., and Variovorax robiniae sp. nov. are proposed. The type strains are UCM-2T (= KACC 18899T = NBRC 112306T), UCMG28T (= KACC 18900T = NBRC 112307T), and UCM-G35T (= KACC 18901T = NBRC 112308T), respectively.

Keywords: Variovorax ureilyticus sp. nov.;Variovorax rhizosphaerae sp. nov.;Variovorax robiniae sp. nov.;taxonomy;soil bacteria;Comamonadaceae

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Proposal of three novel species of soil bacteria, Variovorax ureilyticus, Variovorax rhizosphaerae, and Variovorax robiniae, in the family Comamonadaceae

J. Microbiol. 2018;56(7):485-492. Published online June 14, 2018

DOI: https://doi.org/10.1007/s12275-018-8025-3

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