Chitinophaga dinghuensis sp. nov., isolated from soil

Area of Science:

• Microbiology
• Bacterial Taxonomy
• Environmental Science

Background:

• The genus Chitinophaga comprises aerobic, Gram-negative bacteria known for their role in organic matter decomposition.
• Exploring microbial diversity in unique environments like the Dinghushan Biosphere Reserve is crucial for understanding ecosystem functions.

Purpose of the Study:

• To isolate and characterize a novel bacterial strain from forest soil.
• To determine the taxonomic position of the novel strain DHOC24T within the Chitinophaga genus.
• To propose a new species name and designation for the novel isolate.

Main Methods:

• Isolation and cultivation of bacterial strain DHOC24T from soil samples.
• Morphological, physiological, and biochemical characterization of the isolate.
• Chemotaxonomic analysis, including major quinone and fatty acid profiling.
• Phylogenetic analysis based on 16S rRNA gene sequencing.
• DNA-DNA hybridization for genetic relatedness assessment.

Main Results:

• Strain DHOC24T, a Gram-negative, aerobic, non-motile bacterium, was isolated and exhibited a change in cell morphology during culture.
• Phylogenetic analysis placed strain DHOC24T within the Chitinophaga genus, with highest 16S rRNA gene similarity to Chitinophaga jiangningensis JN53T (98.3%).
• DNA-DNA hybridization revealed low relatedness (32.1%) with C. jiangningensis JN53T, supporting its status as a distinct species.
• Chemotaxonomic data (MK-7, iso-C15:0, C16:1ω5c, iso-C17:0 3-OH) and a DNA G+C content of 43.1 mol% further supported the novel classification.

Conclusions:

• Strain DHOC24T represents a novel species within the genus Chitinophaga.
• The proposed name for this new species is Chitinophaga dinghuensis sp. nov.
• The type strain is DHOC24T (CGMCC 1.12995T = DSM 29821T).