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Analysis of R-primes demonstrates that genes for broad host range nodulation of Rhizobium strain NGR234 are dispersed on the Sym plasmid

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Summary

R-prime plasmids carrying regions of the symbiotic (Sym) plasmid of the broad host range Rhizobium strain NGR234 were isolated in intergeneric matings with Escherichia coli K12. Three R-primes carrying approximately 180 kb (pMN23), 220 kb (pMN31) and 330 kb (pMN49) of Sym DNA were characterized in more detail. Restriction enzyme analysis and hybridization studies showed that these R-primes carried large overlapping regions of the Sym plasmid, and had the symbiotic genes (two copies of nifH, D and K; nodA, B, C and D; region II; host specific nodulation (hsn) genes) located over half of the 470 kb Sym plasmid. Only the largest of these R-primes (pMN49) contained the complete nodulation host range of the original parent strain NGR234. This broad host range was shown to be present on plasmid pMN49 by being expressed in Agrobacterium tumefaciens strain A136. Furthermore the R-prime plasmids were shown to contain different regions of distinctive host specific nodulation (hsn) for tropical legume infection and for the nodulation of the non-legume Parasponia. Nodulation of soybeans, however, required an additional region that was not essential for the nodulation of other tropical legumes. Strain NGR234 was also found to nodulate the stem and roots of the tropical legume Sesbania rostrata at a very low efficiency. However, the R-prime “mini Sym” plasmid constructions enabled a greater efficiency of nodulation of Sesbania rostrata to occur.

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  1. Department of Genetics, Research School of Biological Sciences, Australian National University, P.O. Box 475, 2601, Canberra city, A.C.T., Australia

    Murali Nayudu & Barry G. Rolfe

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  1. Murali Nayudu
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  2. Barry G. Rolfe
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Communicated by J. Schell

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Nayudu, M., Rolfe, B.G. Analysis of R-primes demonstrates that genes for broad host range nodulation of Rhizobium strain NGR234 are dispersed on the Sym plasmid. Mol Gen Genet 206, 326–337 (1987). https://doi.org/10.1007/BF00333591

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  • DOI: https://doi.org/10.1007/BF00333591

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