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Environmental Sampling of Photosynthetic Microbes and Their Viruses: From Field to Lab

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Phycicoccus soli sp. nov., isolated from soil.

Hina Singh¹, KyungHwa Won¹, Hien T T Ngo¹

¹Department of Oriental Medicine Biotechnology, College of Life Science, Kyung Hee University, 1 Seocheon, Kihung Yongin, Gyeonggi 446-701, Republic of Korea.

International Journal of Systematic and Evolutionary Microbiology

|April 16, 2015

Summary

A novel bacterium, Phycicoccus soli sp. nov., was discovered in Korean soil. This Gram-positive coccus represents a new species within the Phycicoccus genus, expanding our understanding of soil microbial diversity.

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Area of Science:

Microbiology
Bacteriology
Taxonomy

Background:

Soil microbial communities harbor diverse, yet uncharacterized, bacterial species.
The genus Phycicoccus is known for its presence in various environmental niches.

Purpose of the Study:

To isolate and characterize a novel bacterium from soil.
To determine the taxonomic placement of the novel isolate within the genus Phycicoccus.

Main Methods:

Isolation and cultivation of strain THG-a14T from Korean soil.
16S rRNA gene sequencing for phylogenetic analysis.
DNA-DNA hybridization and chemotaxonomic analyses (cell-wall composition, fatty acids, polar lipids).

Main Results:

Strain THG-a14T is a Gram-positive, non-motile coccus with optimal growth at 28°C, pH 6.5-7.5, and 0-3% NaCl.
Phylogenetic analysis showed close but distinct relationship to known Phycicoccus species (97.7% 16S rRNA gene similarity to P. aerophilus).
Low DNA-DNA relatedness (<50%) and unique chemotaxonomic features confirmed its status as a novel species.

Conclusions:

Strain THG-a14T represents a new species, proposed as Phycicoccus soli sp. nov.
The polyphasic taxonomy study supports the distinctiveness of this novel soil bacterium.
The type strain is THG-a14T (KACC 17892T = JCM 19837T).