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Bacillus rhizoplanae sp. nov. from maize roots
Peter Kämpfer1, André Lipski2, John A McInroy3
1Institut für Angewandte Mikrobiologie, Universität Giessen, Giessen, Germany.
Summary
A novel bacterium, Bacillus rhizoplanae sp. nov., was identified from maize roots. This Gram-positive, endospore-forming bacterium expands the diversity within the Bacillus genus.
Area of Science:
- Microbiology
- Bacterial Taxonomy
- Plant-Microbe Interactions
Background:
- Maize (Zea mays) root surfaces harbor diverse microbial communities.
- Accurate bacterial classification is crucial for understanding ecological roles and potential applications.
- Genomic and phenotypic analyses are essential for defining novel bacterial species.
Purpose of the Study:
- To taxonomically characterize a bacterial strain isolated from maize roots.
- To determine if the strain represents a new species within the Bacillus genus.
- To provide a comprehensive description including phylogenetic, genotypic, and phenotypic data.
Main Methods:
- Isolation and cultivation of bacteria from maize root surfaces.
- 16S rRNA gene sequencing for preliminary phylogenetic placement.
- Phylogenetic analysis using conserved proteins within Firmicutes.
- Determination of average nucleotide identity (ANI), average amino acid identity (AAI), and digital DNA-DNA hybridization (dDDH).
- Analysis of cellular fatty acids, menaquinone, and polar lipid profiles.
- Physiological and biochemical characterization.
Main Results:
- Strain JJ-63T, isolated from maize roots, is a Gram-positive, aerobic, endospore-forming bacterium.
- Phylogenetic analyses placed strain JJ-63T within the Bacillus genus, closely related to Bacillus pseudomycoides and Bacillus cereus.
- Low ANI, AAI, and dDDH values (<81%, <82%, <27% respectively) distinguished strain JJ-63T from B. pseudomycoides.
- Distinct menaquinone (MK-7), polar lipid, and fatty acid profiles were observed.
- Physiological and biochemical tests revealed unique characteristics differentiating it from related species.
Conclusions:
- Strain JJ-63T represents a distinct species within the Bacillus genus.
- The proposed name for this novel species is Bacillus rhizoplanae sp. nov.
- Bacillus rhizoplanae is characterized by its association with maize roots and unique genotypic and phenotypic traits.
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