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. 1981 Mar;145(3):1129–1136. doi: 10.1128/jb.145.3.1129-1136.1981

Large plasmids of fast-growing rhizobia: homology studies and location of structural nitrogen fixation (nif) genes.

R K Prakash, R A Schilperoort, M P Nuti
PMCID: PMC217112  PMID: 7009569

Abstract

A single large plasmid was isolated from multiplasmid-harboring strains Rhizobium leguminosarum 1001 and R. trifolii 5. These single plasmids, as well as the largest plasmid detectable in R. phaseoli 3622, hybridized with part of the nif structural genes of Klebsiella pneumoniae. In contrast, the plasmids of R. meliloti strains V7 and L5-30 did not show hybridization with the nif genes of K. pneumoniae, indicating that these genes might be located either on the chromosome or on a much larger plasmid which as yet has not been isolated. Studies of the homology between plasmids of fast-growing Rhizobium species showed that a specific deoxyribonucleic acid sequence, which carries the structural genes for nitrogenase, is highly conserved on a plasmid in R. leguminosarum, R. trifolii, and R. phaseoli. Furthermore, it was found that this type of plasmid in the different species shares extensive deoxyribonucleic acid homology, suggesting that strains in the R. leguminosarum cluster have preserved a nif plasmid.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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