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Arcticibacter eurypsychrophilus sp. nov., isolated from ice core
Liang Shen1, Yongqin Liu1, Zhengquan Gu1
1Key Laboratory of Tibetan Environment Changes and Land Surface Processes, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing, 100085, PR China.
International Journal of Systematic and Evolutionary Microbiology
|November 21, 2014
Summary
A novel bacterium, Arcticibacter eurypsychrophilus sp. nov., was isolated from a glacier ice core. This psychrophilic bacterium exhibits unique fatty acid profiles and grows in cold environments.
Area of Science:
- Microbiology
- Extremophile Research
- Glaciology
Background:
- Microbial life in extreme cold environments like glaciers remains incompletely understood.
- Isolation and characterization of novel microorganisms from glacial ice cores contribute to biodiversity knowledge.
Purpose of the Study:
- To isolate and characterize a novel bacterial strain from Muji Glacier ice core.
- To determine the phylogenetic and phenotypic properties of the novel isolate.
- To propose a new species within the genus Arcticibacter.
Main Methods:
- Isolation of strain MJ9-5(T) from glacier ice core.
- Phenotypic characterization including growth conditions (temperature, salinity), colony morphology.
- Analysis of cellular fatty acids and genomic DNA G+C content.
- Phylogenetic analysis using 16S rRNA gene sequences.
Main Results:
- Strain MJ9-5(T) is a Gram-stain-negative, rod-shaped, non-flagellated bacterium.
- Optimal growth occurs between 10-15 °C, tolerating temperatures from -1 to 25 °C and 0-1.2% NaCl.
- Major fatty acids include iso-C15:0 and summed feature 3; G+C content is 38.5 mol%.
- Phylogenetic analysis places strain MJ9-5(T) within the genus Arcticibacter.
Conclusions:
- Strain MJ9-5(T) represents a novel species, Arcticibacter eurypsychrophilus sp. nov., based on distinct phenotypic and phylogenetic data.
- The discovery expands the known diversity of cold-adapted bacteria in glacial environments.
- Arcticibacter eurypsychrophilus sp. nov. is a psychrophilic bacterium adapted to the unique conditions of glacial ice.
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