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

Kjeld C. Engvild, Erik S. Jensen, Leif Skot

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13 Citations (Scopus)


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
Original languageEnglish
Pages (from-to)283-286
Number of pages4
JournalPlant and Soil
Issue number2
Publication statusPublished - Nov 1990


  • effectiveness
  • isoenzymes
  • pisum sativum restriction fragment length polymorphism RFLP
  • Rhizobium leguminosarum bv. viceae
  • restriction fragment length polymorphism
  • Pisum sativum
  • RFLP


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