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Deinococcus lichenicola sp. nov., A Bacterium Isolated from a Lichen Sample
Guo-Hua Chen1, Lian-Shuang Xiong1, Rui Yang1
1The Key Lab for Research & Development of Actinomycete Resources, Yunnan Institute of Microbiology, Chenggong Campus of Yunnan University, Chenggong District, Kunming, 650500, Yunnan, China.
Current Microbiology
|August 26, 2025
Summary
A novel bacterium, Deinococcus lichenicola sp. nov., was isolated from lichen. This Gram-positive coccus represents a new species within the Deinococcus genus, expanding microbial diversity.
Area of Science:
- Microbiology
- Bacteriology
- Taxonomy
Background:
- Lichens host diverse microbial communities.
- Bacterial isolation and characterization are crucial for understanding microbial ecosystems.
Purpose of the Study:
- To isolate and characterize a novel bacterium from lichen.
- To determine the taxonomic position of the novel isolate within the genus Deinococcus.
Main Methods:
- Gram staining and phenotypic characterization.
- Physiological tests for growth conditions (temperature, pH, salinity).
- Respiratory quinone analysis, cellular fatty acid profiling, and polar lipid analysis.
- Phylogenetic analysis based on 16S rRNA gene sequencing.
- DNA G+C content determination, Average Nucleotide Identity (ANI), and Digital DNA-DNA Hybridization (dDDH).
Main Results:
- A Gram-positive, non-motile, coccus-shaped bacterium (YIM 134068T) was isolated from lichen.
- The isolate exhibited optimal growth at 28 °C, pH 7.0, and 0-3.0% NaCl, with MK-8 as the major respiratory quinone.
- Phylogenetic analysis showed highest 16S rRNA gene similarity to Deinococcus aetherius ST0316T (93.2%).
- DNA G+C content was 69.1%, with ANI and dDDH values of 82.6-83.0% and 26.3-26.7% respectively, differentiating it from related species.
Conclusions:
- Strain YIM 134068T represents a novel species within the genus Deinococcus.
- The proposed name for this new species is Deinococcus lichenicola sp. nov.
- This finding contributes to the taxonomic knowledge of the Deinococcus genus and lichen-associated bacteria.
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