Abstract
A subtraction hybridization and PCR amplification procedure was used to isolate two Rhizobium DNA probes which exhibited high degrees of specificity at different levels of taxonomic organization and which could be used as tools for detection of rhizobia in ecological studies. First, a probe was isolated from Rhizobium leguminosarum by. trifolii strain P3 by removing those Sau3A restriction fragments from a P3 DNA digest which cross hybridized with pooled DNA from seven other strains of the same biovar. The remaining restriction fragments hybridized to DNA from strain P3 but not to DNA from any of the seven other strains. In a similar experiment another DNA probe, specific for the Rhizobium leguminosarum by. phaseoli and Rhizobium tropici group, was generated by removing sequences from R. leguminosarum by phaseoli strain Kim 5s with pooled subtracter DNA from eight other Rhizobium,Bradyrhizobium and Agrobacterium species. The same subtraction hybridization technique was also used to isolate symbiotic genes from a Rhizobium species. Results from a 1:1 subtractive DNA hybridization of the broad host range Rhizobium sp NGR234 against highly homologous S. fredii USDA257, combined with those from competitive RNA hybridizations to cosmid digests of the NGR234 symbiotic plasmid, allowed the identification of several NGR234 loci which were flavonoid-inducible and not present in S. fredii USDA257. One of these, ORF-1, was highly homologous to the leucine responsive regulatory protein of E. coli.
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© 1998 Springer Science+Business Media Dordrecht
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Cooper, J.E., Bjourson, A.J., Streit, W., Werner, D. (1998). Isolation of unique nucleic acid sequences from rhizobia by genomic subtraction: Applications in microbial ecology and symbiotic gene analysis. In: Hardarson, G., Broughton, W.J. (eds) Molecular Microbial Ecology of the Soil. Developments in Plant and Soil Sciences, vol 83. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-2321-3_4
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DOI: https://doi.org/10.1007/978-94-017-2321-3_4
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