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In Situ Isolation and Culturing of Recalcitrant Soil Bacteria using an Isolation Chip (iChip)

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Microbacterium insulae sp. nov., isolated from soil.

Jung-Hoon Yoon¹, Peter Schumann, So-Jung Kang

¹Korea Research Institute of Bioscience and Biotechnology (KRIBB), PO Box 115, Yusong, Taejon, Republic of Korea. jhyoon@kribb.re.kr

International Journal of Systematic and Evolutionary Microbiology

|June 23, 2009

Summary

A novel bacterium, Microbacterium insulae sp. nov. strain DS-66(T), was discovered in Dokdo soil. This Gram-positive, non-motile bacterium expands the known diversity within the Microbacterium genus.

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Area of Science:

Microbiology
Bacterial Taxonomy
Environmental Microbiology

Background:

The genus Microbacterium comprises diverse Gram-positive bacteria found in various environments.
Accurate taxonomic classification is crucial for understanding microbial diversity and ecological roles.
Soil ecosystems harbor a vast, largely uncharacterized microbial population.

Purpose of the Study:

To isolate and characterize a novel Microbacterium-like bacterium from Dokdo soil.
To determine the precise taxonomic position of the isolated strain DS-66(T) using a polyphasic approach.
To propose a new species within the Microbacterium genus if distinct characteristics are identified.

Main Methods:

Isolation and cultivation of strain DS-66(T) from Dokdo soil.
Polyphasic taxonomic analysis including 16S rRNA gene sequencing, chemotaxonomic analyses (peptidoglycan, whole-cell sugars, menaquinones, fatty acids, polar lipids), and DNA G+C content determination.
Phylogenetic analysis and DNA-DNA relatedness studies to assess taxonomic distinctiveness.

Main Results:

Strain DS-66(T) is a Gram-positive, non-motile, rod- or coccoid-shaped bacterium.
Optimal growth conditions were determined as 30°C, pH 6.5-7.0, and 0.5-1.0% NaCl.
Phylogenetic and chemotaxonomic data, including unique fatty acid profiles and peptidoglycan composition, distinguished strain DS-66(T) from known Microbacterium species, with a DNA G+C content of 69.9 mol%.

Conclusions:

Strain DS-66(T) represents a novel species within the genus Microbacterium.
The proposed name for this new species is Microbacterium insulae sp. nov.
The type strain is DS-66(T) (=KCTC 19247(T)=CCUG 54523(T)).