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Divergent bacterial transformation exerted by soil minerals
Qiong Huang1, Jinxiu Chen1, Jiaojiao Zhu1
1State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan 430070, China; Hubei Key Laboratory of Soil Environment and Pollution Remediation, Huazhong Agricultural University, Wuhan 430070, China.
The Science of the Total Environment
|June 5, 2021
Summary
Soil minerals impact bacterial transformation efficiency. Kaolinite and montmorillonite inhibit it by adsorbing competence-stimulating factor, while goethite
Area of Science:
- Microbiology
- Environmental Science
- Genetics
Background:
- Bacterial transformation is crucial for adaptation but is inhibited by soil minerals.
- Mechanisms by which soil components affect transformation, especially competence development, are poorly understood.
Purpose of the Study:
- To investigate the effects of specific soil minerals (kaolinite, montmorillonite, goethite) on Bacillus subtilis transformation.
- To elucidate the underlying mechanisms, including competence development and mineral interactions.
Main Methods:
- Assessing bacterial transformation efficiency using chemical adsorption, Live-Dead staining, and qPCR.
- Analyzing the adsorption of competence-stimulating factor (CSF) and DNA by minerals.
- Evaluating gene expression related to competence development.
Main Results:
- Kaolinite and montmorillonite reduced transformation by adsorbing CSF and down-regulating competence-related genes.
- Goethite inhibited transformation at low concentrations via DNA adsorption but increased it at high concentrations due to membrane damage.
- Identified three key mechanisms: CSF adsorption, gene expression changes, and membrane damage.
Conclusions:
- Soil minerals exert diverse effects on bacterial transformation through distinct mechanisms.
- Findings challenge previous assumptions about mineral impacts and reveal complex interactions.
- This study advances understanding of bacterial genetic transformation in mineral-rich environments.
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