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Species-specific, symbiotic plasmid-located repeated DNA sequences in Rhizobium trifolii

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Summary

A repeated DNA sequence has been characterized in the clover symbiont, Rhizobium trifolii. Analysis of three copies of this repeated sequence revealed that it constitutes a reiteration of the nifHDK promoter region and, in some copies, an additional reiteration of the N-terminal end of the nifH gene. This sequence, as exemplified by the nifHDK promoter region, is highly conserved within all the geographically-distinct isolates of R. trifolii examined, and is located exclusively on the Sym (symbiotic) plasmid. The R. trifolii repeated sequences (designated RtRS) were shown by DNA hybridization analysis to be specific for R. trifolii and not to hybridize to DNA of any other fastgrowing Rhizobium species examined. Based on the observed species-specificity and Sym-plasmid location of these sequences, as well as the available genetic evidence, we propose a model in which the expression of symbiotic genes is host-specifically activated via these species-specific repeated (promoter) sequences. The results presented indicate that the RtRS sequences can be used as a molecular probe for both species and strain identification and should facilitate the molecular taxonomy of Rhizobium.

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  1. John M. Watson & Peter R. Schofield

    Present address: CSIRO Division of Plant Industry, GPO Box 1600, 2601, Canberra City, ACT, Australia

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  1. Centre for Recombinant DNA Research, Research School of Biological Sciences, Australian National University, GPO Box 4, 2601, Canberra City, ACT, Australia

    John M. Watson & Peter R. Schofield

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  1. John M. Watson
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  2. Peter R. Schofield
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Communicated by H. Saedler

Dedicated to Professor Georg Melchers to celebrate his 50-year association with the journal

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Watson, J.M., Schofield, P.R. Species-specific, symbiotic plasmid-located repeated DNA sequences in Rhizobium trifolii . Molec Gen Genet 199, 279–289 (1985). https://doi.org/10.1007/BF00330270

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