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Megaplasmids in the plant-associated bacteria Rhizobium meliloti and Pseudomonas solanacearum
Journal of Bacteriology
|April 1, 1982
Abstract:
Using analytical and preparative methods, we demonstrated the presence of megaplasmids with molecular weight larger than 450 x 10(6) in the two plant-associated bacteria Rhizobium meliloti and Pseudomonas solanacearum. Such giant plasmids were found in 8 of 9 P. solanacearum strains tested and in all of the 18 R. meliloti strains tested.
Insights
Giant plasmids, large DNA molecules, were found in plant-associated bacteria Rhizobium meliloti and Pseudomonas solanacearum. These megaplasmids are significant for understanding bacterial genetics and plant interactions.
Area of Science:
- Microbiology
- Genetics
- Plant Pathology
Background:
- Plant-associated bacteria play crucial roles in agriculture and ecosystems.
- Plasmids are extrachromosomal DNA elements that can confer adaptive traits.
- The presence and characteristics of large plasmids in these bacteria are not fully understood.
Purpose of the Study:
- To investigate the presence and characteristics of megaplasmids in Rhizobium meliloti and Pseudomonas solanacearum.
- To determine the prevalence of these large plasmids within bacterial populations.
Main Methods:
- Analytical methods for DNA analysis.
- Preparative methods for isolating and characterizing plasmids.
- Screening of multiple bacterial strains.
Main Results:
- Megaplasmids with molecular weights exceeding 450 x 10^6 were identified.
- These giant plasmids were detected in 8 out of 9 Pseudomonas solanacearum strains.
- All 18 Rhizobium meliloti strains tested harbored these megaplasmids.
Conclusions:
- Rhizobium meliloti and Pseudomonas solanacearum frequently carry megaplasmids.
- The widespread presence of these large plasmids suggests their importance for the biology of these plant-associated bacteria.