Pedobacter puniceum sp. nov. Isolated from Sludge

Area of Science:

• Microbiology
• Bacteriology
• Environmental Science

Background:

• The genus Pedobacter comprises Gram-negative bacteria found in various environments.
• Characterization of novel bacterial species is crucial for understanding microbial diversity and ecological roles.

Purpose of the Study:

• To isolate and characterize a novel bacterial strain from agricultural sludge.
• To determine the taxonomic position of the novel strain within the genus Pedobacter.

Main Methods:

• Isolation and cultivation of bacteria from sludge.
• Gram staining, morphology, and physiological tests.
• 16S rRNA gene sequencing and phylogenetic analysis.
• Genomic DNA G+C content determination.
• Chemotaxonomic analysis (fatty acids, ubiquinone, polar lipids).
• Genomic analysis (ANI and dDDH values).

Main Results:

• Strain HX-22-1^T is a Gram-negative, rod-shaped, non-spore-forming, non-flagellated bacterium.
• Phylogenetic analysis based on 16S rRNA gene sequences showed close relatedness to Pedobacter glucosidilyticus (98.63% similarity).
• Genomic analysis revealed ANI (89.6%) and dDDH (38.8%) values below the thresholds for species delineation.
• Optimal growth conditions were determined: 16-37°C, pH 6.0-8.0, and 0-1% NaCl.
• Chemotaxonomic data (fatty acids, ubiquinone, polar lipids) supported its placement within the genus Pedobacter.

Conclusions:

• Strain HX-22-1^T represents a novel species within the genus Pedobacter.
• The proposed name for this new species is Pedobacter puniceum sp. nov.
• The type strain is HX-22-1^T (KCTC 72655^T = CCTCC AB 2019348^T).