Paenibacillus physcomitrellae sp. nov., isolated from the moss Physcomitrella patens

Area of Science:

• Microbiology
• Bacterial Taxonomy
• Plant-Associated Microbes

Background:

• The genus Paenibacillus comprises diverse bacteria, some of which interact with plants.
• Understanding bacterial diversity associated with model organisms like Physcomitrella patens is crucial for ecological studies.

Purpose of the Study:

• To isolate and characterize a novel bacterial species from the moss Physcomitrella patens.
• To determine the taxonomic position of the novel isolate within the Paenibacillus genus.

Main Methods:

• Bacterial isolation and cultivation from Physcomitrella patens.
• Phenotypic characterization including Gram staining, motility, and enzymatic tests.
• Chemotaxonomic analysis of polar lipids, isoprenoid quinones, and cell-wall peptidoglycan.
• Phylogenetic analysis based on 16S rRNA gene sequencing.
• Genomic DNA G+C content determination.

Main Results:

• A novel Gram-positive, facultatively anaerobic, rod-shaped bacterium (strain XBT) was isolated.
• Strain XBT exhibited spore-forming, motile, catalase-negative, and weakly oxidase-positive characteristics.
• Chemotaxonomic analysis revealed specific polar lipids, MK-7 quinone, and meso-diaminopimelic acid.
• Phylogenetic analysis placed strain XBT within the Paenibacillus genus, with Paenibacillus yonginensis as the closest neighbor (96.6% 16S rRNA gene sequence similarity).
• The G+C content of the genomic DNA was 53.3%.

Conclusions:

• Based on integrated phenotypic, chemotaxonomic, and phylogenetic data, strain XBT represents a new species within the genus Paenibacillus.
• The proposed name for this novel species is Paenibacillus physcomitrellae sp. nov., with strain XBT as the type strain.