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Isolation of lightning-competent soil bacteria
Hélène Cérémonie1, François Buret, Pascal Simonet
1Ecologie Microbienne UMR-CNRS 5557, Université Claude Bernard Lyon 1, BAt. G. Mendel, 43 Blvd. du 11 Novembre 1918, 69622 Villeurbanne Cedex, France.
Applied and Environmental Microbiology
|October 7, 2004
Summary
Researchers discovered two new soil bacteria capable of transformation using lightning. These "lightning-competent" bacteria were isolated from prairie soil and successfully transformed using direct electroporation and simulated lightning.
Area of Science:
- Microbiology and Biotechnology
- Environmental Science
- Molecular Biology
Background:
- Artificial bacterial transformation is crucial for genetic research and biotechnology.
- Traditional methods like chemical transformation (CaCl2) and electroporation are lab-based.
- Recent studies demonstrated laboratory-scale lightning can electrotransform bacteria in soil.
Purpose of the Study:
- To isolate and characterize novel soil bacteria exhibiting "lightning-competence".
- To assess the electrotransformation efficiency of isolated bacteria in vitro and in situ.
- To compare the transformation capabilities of isolated strains with known bacterial models.
Main Methods:
- Isolation of bacteria from prairie soil using Nycodenz bacterial ring extraction.
- Direct electroporation of extracted bacteria with the pBHCRec plasmid under simulated lightning conditions.
- In vitro electroporation and in situ soil microcosm experiments to measure electrotransformation frequencies.
Main Results:
- Two novel "lightning-competent" soil bacteria, identified as Pseudomonas sp. strains, were successfully isolated.
- Electrotransformation frequencies ranged from 10(-3) to 10(-4) via electroporation and 10(-4) to 10(-5) via simulated lightning.
- No transformation occurred in the absence of electrical current, confirming the necessity of electrical stimulation.
Conclusions:
- Novel Pseudomonas sp. strains demonstrate significant electrocompetence, enabling transformation via lightning.
- This study expands the understanding of bacterial transformation in natural soil environments.
- Lightning-induced transformation offers a potential new method for genetic engineering in situ.