Lutibacter citreus sp. nov., isolated from Arctic surface sediment
Zhao-Zhong Du1, Liu-Yan Zhou1, Tao-Jie Wang1
1Marine College, Shandong University, Weihai, Shandong 264209, PR China.
Summary
A novel yellow-pigmented bacterium, Lutibacter citreus 1KV19T, was discovered in Arctic sediments. This aerobic, Gram-negative rod expands the known diversity within the Lutibacter genus.
Area of Science:
- Microbiology
- Bacterial Taxonomy
- Arctic Ecology
Background:
- The genus *Lutibacter* comprises marine bacteria with limited species described.
- Exploring microbial diversity in extreme environments like the Arctic is crucial for understanding adaptation and biogeochemical cycles.
Purpose of the Study:
- To isolate and characterize a novel bacterial strain from Arctic marine sediment.
- To determine the phylogenetic and taxonomic position of the novel strain within the *Lutibacter* genus.
Main Methods:
- Isolation and cultivation of strain 1KV19T from Arctic surface sediment.
- Physicochemical characterization including optimal growth conditions (NaCl, temperature, pH).
- Phylogenetic analysis using 16S rRNA gene sequences, Average Nucleotide Identity (ANI), and Digital DNA-DNA Hybridization (dDDH).
- Chemotaxonomic analysis of cellular fatty acids and polar lipids.
Main Results:
- Strain 1KV19T is a Gram-negative, aerobic, non-motile, yellow-pigmented rod.
- Optimal growth occurs at 2% NaCl, 25-30°C, and pH 7.0-7.5.
- Phylogenetic analysis places strain 1KV19T within the *Lutibacter* genus, with 98.1% 16S rRNA gene sequence similarity to *Lutibacter oceani* 325-5T.
- ANI and dDDH values (76.4-79.1% and 19.9-22.3%, respectively) confirm its distinction from related species.
- Major fatty acids include iso-C15:0 3-OH, iso-C15:0, and iso-C16:1 cis-9; major polar lipids are phosphatidylethanolamine, an unidentified aminolipid, and two unidentified polar lipids.
Conclusions:
- Strain 1KV19T represents a novel species within the genus *Lutibacter*, proposed as *Lutibacter citreus* sp. nov.
- The phenotypic, genotypic, and chemotaxonomic data support the classification of *Lutibacter citreus* as a distinct species.
- This discovery contributes to the understanding of bacterial diversity in Arctic marine ecosystems.
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