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Parallel variation in isoenzyme and nitrogen fixation markers in a Rhizobium population

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Abstract

Twenty isolates of Rhizobium leguminosarum bv. viceae were isolated at random from one field and examined for symbiotic plasmid fragment length polymorphisms and for isoenzyme patterns. The latter are most probably chromosome markers. With one exception both methods separated the isolates into the same 13 different groups. The largest group was represented 7 times according to isoenzymes and 8 times according to RFLP. This fixed non-random association of plasmid and chromosomal genotypes is consistent with a clonal population structure; it indicates limited exchange of plasmids under natural conditions. Seventeen isolates of 11 groups were highly effective and 2 isolates in one group almost ineffective.

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Authors and Affiliations

  1. Agricultural Research Department, Risø National Laboratory, DK-4000, Roskilde, Denmark

    Kjeld C. Engvild & Erik Steen Jensen

  2. AFRC Institute for Grassland and Animal Production, Welsh Plant Breeding Station, Plas Gogerddan, SY23 3EB, Aberystwyth, Dyfed, UK

    Leif Skøt

Authors
  1. Kjeld C. Engvild
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  2. Erik Steen Jensen
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  3. Leif Skøt
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Engvild, K.C., Jensen, E.S. & Skøt, L. Parallel variation in isoenzyme and nitrogen fixation markers in a Rhizobium population. Plant Soil 128, 283–286 (1990). https://doi.org/10.1007/BF00011120

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  • DOI: https://doi.org/10.1007/BF00011120

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