Sphingobacterium oryzagri sp. nov., isolated from rice paddy soil

Area of Science:

• Microbiology
• Bacteriology
• Taxonomy

Background:

• The genus Sphingobacterium comprises Gram-negative bacteria found in various environments.
• Understanding bacterial diversity in agricultural soils like rice paddies is crucial for soil health and ecosystem function.

Purpose of the Study:

• To isolate and characterize a novel bacterial strain from rice paddy soil.
• To determine the taxonomic placement of the novel strain within the Sphingobacterium genus through polyphasic characterization.

Main Methods:

• Isolation and cultivation of bacteria from rice paddy soil.
• Phylogenetic analysis using 16S rRNA gene sequences.
• Genome-based phylogenetic analysis.
• Chemotaxonomic analysis (respiratory quinone, polar lipids, fatty acids).
• Determination of phenotypic characteristics (growth conditions, morphology).

Main Results:

• A novel aerobic, Gram-negative, short rod-shaped bacterium, strain M6-31T, was isolated.
• Phylogenetic analyses indicated that strain M6-31T belongs to the genus Sphingobacterium.
• Genomic and chemotaxonomic data supported the distinction of strain M6-31T from known Sphingobacterium species, with ANI and dDDH values below thresholds for novel species.
• Strain M6-31T exhibited specific growth parameters and biochemical properties.

Conclusions:

• Strain M6-31T represents a novel species within the genus Sphingobacterium.
• The proposed name for this new species is Sphingobacterium oryzagri sp. nov.
• This discovery contributes to the knowledge of microbial diversity in rice paddy ecosystems.