Chryseobacterium lineare sp. nov., isolated from a limpid stream

Area of Science:

• Microbiology
• Bacterial Taxonomy
• Environmental Microbiology

Background:

• The genus Chryseobacterium comprises Gram-negative bacteria with diverse environmental habitats.
• Accurate taxonomic classification is crucial for understanding bacterial roles and interactions.

Purpose of the Study:

• To characterize a novel bacterial isolate, strain XC0022T, from a freshwater stream in Zhejiang, China.
• To determine the phylogenetic and chemotaxonomic properties of strain XC0022T.
• To formally propose a new species within the Chryseobacterium genus.

Main Methods:

• Polyphasic taxonomic analysis including 16S rRNA gene sequencing.
• DNA-DNA hybridization (DDH) for genetic relatedness assessment.
• Analysis of major fatty acids, polar lipids, and respiratory quinones.
• Determination of G+C content of genomic DNA.

Main Results:

• Strain XC0022T is a Gram-negative, aerobic, non-motile, rod-shaped, yellow-pigmented bacterium.
• Phylogenetic analysis based on 16S rRNA gene sequences showed highest similarity (98.0%) to Chryseobacterium taeanense.
• DNA-DNA hybridization values were below 70% with related Chryseobacterium species, supporting novelty.
• Chemotaxonomic data (MK-6 quinone, major fatty acids, polar lipids) and G+C content (29.7 mol%) were consistent with the genus.

Conclusions:

• Strain XC0022T represents a distinct species within the genus Chryseobacterium.
• The proposed name for this novel species is Chryseobacterium lineare sp. nov.
• This finding contributes to the understanding of bacterial diversity in freshwater ecosystems.