Summary
After the initial screening of more than 200 Frankia strains, the plasmid DNA observed in eight Frankiae was analyzed. In situ lysis was performed to obtain an estimate of their copy number and molecular weight. Four plasmid classes were distinguished, 7–9, 18–20, 30–35 and 50–55 kb. Twelve plasmids were thus analysed with restriction enzymes to determine their plasmid restriction patterns.
While some Frankia plasmids with comparable molecular weights were found to be heterologous in their restriction enzyme pattern, an 8 kb plasmid found in both Frankia sp. ArI3, isolated from Alnus rubra and Frankia sp. CpIl isolated from Comptonia peregrina showed undistinguishable ‘fingerprints’. Furthermore, an 18 kb plasmid found in the same two strains, also showed homologous restriction enzyme patterns. However, the copy numbers of the two ArI3 plasmids were higher than,those CpIl plasmids.
Similarly, strains \( ACN{1^{AG}},TX41_b^{\underline {AC} }and{\text{ }}TX38_b^{\underline {AC} }, \), isolated from Alnus crispa all contained a 50 kb plasmid, and the three plasmids were found upon restriction analysis to be undistinguishable.
In one strain, ARgX17c isolated from Alnus rugosa, it was found through restriction enzyme analysis that two plasmids of a similar molecular weight were in fact heterologous.
The possible origin of the homologous plasmids and their potential as specific Frankia markers to be used in ecological studies are discussed.
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Simonet, P., Normand, P., Moiroud, A., Lalonde, M. (1985). Restriction enzyme digestion patterns of Frankia plasmids. In: Lalonde, M., Camiré, C., Dawson, J.O. (eds) Frankia and Actinorhizal Plants. Developments in Plant and Soil Sciences, vol 18. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-5147-1_5
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DOI: https://doi.org/10.1007/978-94-009-5147-1_5
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