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In Situ Isolation and Culturing of Recalcitrant Soil Bacteria using an Isolation Chip (iChip)
Published on: August 6, 2025
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Microbacterium salitolerans sp. nov., isolated from saline soil
Pengze Bai1,2, Ya Chen1, Fang Liu1
1School of Life Science, Beijing Institute of Technology, Beijing 100081, PR China.
International Journal of Systematic and Evolutionary Microbiology
|January 20, 2026
Summary
A novel soil bacterium, *Microbacterium salitolerans* G2-8T, was identified in Tianjin, China. This salt-tolerant bacterium represents a new species within the *Microbacterium* genus, expanding our understanding of microbial diversity.
Area of Science:
- Microbiology
- Bacterial Taxonomy
- Environmental Microbiology
Background:
- Soil ecosystems harbor diverse microbial communities with unique adaptations.
- The genus *Microbacterium* comprises Gram-positive bacteria found in various environments.
- Characterizing novel bacterial isolates is crucial for understanding biodiversity and potential applications.
Purpose of the Study:
- To isolate and characterize a novel bacterial strain from a saline soil environment.
- To determine the phylogenetic and taxonomic position of the novel isolate using polyphasic methods.
- To propose a new species designation for the characterized bacterium.
Main Methods:
- Isolation and cultivation of bacteria from saline soil samples.
- Morphological, physiological, and biochemical characterization of the bacterial isolate.
- Phylogenetic analysis based on 16S rRNA gene sequencing and whole-genome sequencing (phylogenomics).
- Chemotaxonomic analysis including fatty acid composition, polar lipids, and respiratory quinones.
- Genomic analysis including Average Nucleotide Identity (ANI) and digital DNA-DNA hybridization (dDDH).
Main Results:
- Strain G2-8T was identified as a Gram-positive, aerobic, non-motile rod.
- Phylogenetic analyses placed strain G2-8T within the genus *Microbacterium*, showing highest similarity to *Microbacterium excoecariae*.
- The isolate exhibited tolerance to a wide range of salt concentrations (up to 13.0% NaCl) and temperatures (4-40 °C).
- Genomic analyses (ANI, dDDH) confirmed that strain G2-8T represents a distinct lineage, separate from known *Microbacterium* species.
- Key chemotaxonomic markers included anteiso-C15:0 and anteiso-C17:0 as major fatty acids and MK-10, MK-11, MK-12 as major respiratory quinones.
Conclusions:
- Strain G2-8T represents a novel species within the genus *Microbacterium*.
- The proposed name for this new species is *Microbacterium salitolerans* sp. nov.
- This finding contributes to the knowledge of bacterial diversity in saline environments and the taxonomy of the genus *Microbacterium*.
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