Summary
Nodulation ability was transferred from Rhizobium meliloti L5.30 to the non-nodulating mutant Rhizobium trifolii 24K using plasmid R68.45. Transconjugants selected for the carbenicillin resistance (cb r) marker became simultaneously capable of nodulating clover and showed changes in phage sensitivity. Besides the indigenous plasmid of 90 MD (pUCS201), the nodulating transconjugants harbored the newly introduced plasmid pUCS202 (ca. 40 MD). After treatment of the transconjugants with curing agents the simultaneous loss of antibiotic resistance and ability to form nodules were associated with the disappearance of pUCS202. nod and cb r genes were cotransferred into R. trifolii strains by conjugation and transformation. There is genetic evidence that the nod gene(s) was integrated into R68.45.
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Communicated by J. Schell
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Kowalczuk, E., Skorupska, A. & Lorkiewicz, Z. Transfer of nodulation ability in Rhizobium using R68.45 derived plasmids. Molec. Gen. Genet. 183, 388–391 (1981). https://doi.org/10.1007/BF00270645
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DOI: https://doi.org/10.1007/BF00270645