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Liu Y, Li S, Lin J, Liu S, Wei H, Dai J, Qiu D. Pseudaquidulcibacter saccharophilus gen. nov., sp. nov., a novel member of family Caulobacteraceae, isolated from a water purification facility with supplement of starch as a carbon source. Int J Syst Evol Microbiol 2022; 72. [DOI: 10.1099/ijsem.0.005264] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
During a survey of microbial communities in the influent (ambient water) and effluent of a water purification facility with aeration and supplement of starch as carbon source, a novel bacterial strain, designated SZ9T, was isolated from the effluent sample. Colonies of strain SZ9T were small (approximately 0.5–1.0 mm in diameter), creamy-white, circular, smooth, translucent and convex. Cells were facultative anaerobic, motile by means of a single polar flagellum, rod-shaped, multiplied by binary fission, Gram-stain-negative, oxidase-positive and catalase-negative. Growth occurred at 10–40 °C (optimum, 28 °C) and pH 5.5–8.0 (optimum, pH 7.5). The range of NaCl concentration for growth was 0–1.0 % (w/v), with an optimum of 0–0.5 % (w/v). Phylogenetic analysis based on 16S rRNA gene sequences suggested that strain SZ9T formed a lineage within the family
Caulobacteraceae
of the class
Alphaproteobacteria
and showed the highest 16S rRNA gene sequence similarities to
Aquidulcibacter paucihalophilus
TH1-2T (92.44%), followed by
Vitreimonas flagellata
SYSU XM001T (89.61 %),
Asprobacter aquaticus
DRW22-8T (89.49 %) and
Hyphobacterium vulgare
WM6T (89.49%). The predominant fatty acids (>10 % of the total fatty acids) of strain SZ9T was summed feature 3 (comprising C16 : 1
ω6c and/or C16 : 1
ω7c), summed feature 8 (C18 : 1
ω6c and/or C18 : 1
ω7c) and C16 : 0. The sole respiratory quinone was ubiquinone-10, and the major polar lipids were phosphatidylcholine and two unidentified glycolipids. The whole genome of strain SZ9T was 2 842 140 bp in size, including 2769 protein-coding genes, 37 tRNA genes and two rRNA genes, and the genomic G+C content was 41.4 mol%. The orthologous average nucleotide identity, average amino acid identity and digital DNA–DNA hybridization values between strain SZ9T and other genera within the family
Caulobacteraceae
were 64.50–66.62 %, 46.96–54.17 % and 27.70–31.70 %, respectively. Therefore, based on the results of phenotypic, chemotaxonomic and phylogenetic analyses, the isolated strain SZ9T could be distinguished from other genera, suggesting that it represents a novel species of a novel genus in the family
Caulobacteraceae
, for which the name Pseudaquidulcibacter saccharophilus gen. nov., sp. nov is proposed. The type strain is SZ9T (=CCTCC AB2021029T=KCTC 82788T).
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Affiliation(s)
- Yaqi Liu
- Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, PR China
| | - Shuyang Li
- Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, PR China
| | - Jing Lin
- Shenzhen Biyuan Environmental Protection Technic Co., Ltd., Shenzhen 518000, PR China
| | - Shuangyuan Liu
- Eco-Environmental Monitoring and Research Center, Pearl River Valley and South China Sea Ecology and Environment Administration, Ministry of Ecology and Environment, Guangzhou 510610, PR China
- Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, PR China
| | - Hehong Wei
- College of Energy and Environmental Engineering, Hebei University of engineering, Handan 056038, PR China
- Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, PR China
| | - Jingcheng Dai
- Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, PR China
| | - Dongru Qiu
- Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, PR China
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