1887

Abstract

A Gram-stain-negative, smooth, bright-yellow-pigmented, rod-shaped bacterial strain, slightly motile by gliding, catalase- and oxidase-positive and aerobic, but growing weakly under anaerobic conditions, was isolated from the rhizosphere of the flower mugunghwa (Hibiscus syriacus L.) located in Kyung Hee University, Yongin, Gyeonggi, South Korea. The strain named THG-HG1.4 grew at 15–35 °C, pH 6.5–9.0 and in the presence of 0–2.5 % (w/v) NaCl. The phylogenetic analysis based on 16S rRNA gene sequence showed that strain THG-HG1.4 was most closely related to Flavobacterium gyeonganense HME7524 (98.83 %) and Flavobacterium arsenitoxidans S2-3H (97.28 %). The DNA G+C content of strain THG-HG1.4 was 41.2 mol%. In DNA–DNA hybridization, the DNA–DNA relatedness between strain THG-HG1.4 and its closest phylogenetic neighbour was below 64.1 %. The predominant isoprenoid quinone detected in strain THG-HG1.4 was menaquinone-6 (MK-6). The major polar lipids were found to be phosphatidylethanolamine, three unidentified lipids, two unidentified glycolipids and an unidentified aminolipid. The major fatty acids were identified as iso-C15 : 0, iso-C15 : 0 3-OH, C16 : 0, iso-C17 : 0 3-OH and summed feature 3. Thus, based on the report of the phenotypic, genotypic and phylogenetic characterization of strain THG-HG1.4, it has been concluded that the novel isolate represents a novel species of the genus Flavobacterium. Flavobacterium hibisci sp. nov. is proposed, with THG-HG1.4 (=KACC 18852=CCTCC AB 2016178) as the type strain.

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2017-04-03
2019-10-19
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