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Marmoricola korecus sp. nov.

Soon Dong Lee^1,2, Dong Wan Lee², Young-Hwan Ko³

¹Educational Science Research Institute, Jeju National University, Jeju 690-756, Republic of Korea.

International Journal of Systematic and Evolutionary Microbiology

|August 10, 2010

Summary

A novel actinomycete, Marmoricola korecus sp. nov., was discovered in volcanic ash. This aerobic, Gram-positive coccoid bacterium represents a new species within the Marmoricola genus.

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Area of Science:

Microbiology
Bacteriology
Actinobacteria Taxonomy

Background:

Actinomycetes are a diverse group of bacteria with significant ecological and biotechnological roles.
The genus Marmoricola comprises actinomycetes known for their unique adaptations to various environments.
Isolation of novel microorganisms from extreme environments like volcanic ash can reveal new bacterial lineages.

Purpose of the Study:

To characterize a novel actinomycete strain, Sco-A36(T), isolated from volcanic ash.
To determine the taxonomic position of strain Sco-A36(T) within the genus Marmoricola.
To propose a new species designation for the novel isolate based on polyphasic characterization.

Main Methods:

Isolation and cultivation of actinomycetes from volcanic ash samples.
Morphological, physiological, and biochemical characterization of strain Sco-A36(T).
Phylogenetic analysis based on 16S rRNA gene sequences.
Determination of chemotaxonomic markers (cell wall diamino acid, menaquinone, polar lipids, fatty acids).
DNA-DNA hybridization and DNA G+C content determination.

Main Results:

Strain Sco-A36(T) exhibited aerobic, Gram-stain-positive, non-motile coccoid characteristics with yellow colonies.
Phylogenetic analysis placed strain Sco-A36(T) within the genus Marmoricola, with highest 16S rRNA gene similarity to Marmoricola aurantiacus and Marmoricola scoriae (97.9%).
Chemotaxonomic data (ll-diaminopimelic acid, MK-8(H4), specific polar lipids and fatty acids) were consistent with the genus Marmoricola.
Low DNA-DNA relatedness (4.9-29.2%) between strain Sco-A36(T) and recognized Marmoricola type strains confirmed its distinctiveness.
DNA G+C content was 71.0 mol%.

Conclusions:

Strain Sco-A36(T) represents a novel species of the genus Marmoricola.
The proposed name for this new species is Marmoricola korecus sp. nov.
The type strain is Sco-A36(T) (= KCTC 19596(T) = DSM 22128(T)).