1887

Abstract

A bacterial strain, TH019, was isolated from cyanobacterial aggregates in a eutrophic lake, Taihu Lake, China. Cells were observed to be slightly curved rod-shaped and stained Gram-negative. Optimal growth was obtained at pH 7.0 (range, 5.0–9.0) and 28 °C (range, 20-37 °C) in R2A broth. The cells were found to be positive for oxidase and catalase activities, nitrate reduction and denitrification. The major respiratory quinone was ubiquinone Q-10. The major fatty acids were identified as C ω6/C  ω7 and C 2OH. The 16S rRNA gene sequence of strain TH019 was phylogenetically related to Dia-1 (97.9 % similarity). The genomic G+C content of strain TH019 was 62.4 mol% based on total genome calculations. Average nucleotide identity and digital DNA–DNA hybridization values for complete genomes were 78.8 and 19.8 %, respectively, between strain TH019 and Dia-1. The phenotypic, chemotaxonomic and phylogenetic properties, and genome analysis suggested that strain TH019 represented a novel species within the genus , for which the name sp. nov. is proposed. The type strain is TH019 (=CGMCC 1.15802=LMG 29721).

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2017-10-01
2020-01-22
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