Plant and Soil

, Volume 186, Issue 1, pp 69–74

Corresponding 16S rRNA gene segments in Rhizobiaceae and Aeromonas yield discordant phylogenies

  • B. D. Eardly
  • F. -S. Wang
  • P. van Berkum


Previous evidence has indicated that the 16S rRNA genes in certain species of Aeromonas may have a history of lateral transfer and recombination. A comparative analysis of patterns of 16S nucleotide sequence polymorphism among species of Rhizobium and Agrobacterium was conducted to determine if there is similar evidence for chimeric 16S genes in members of the Rhizobiaceae. Results from phylogenetic analyses and comparison of patterns of nucleotide sequence polymorphism in portions of rhizobial 16S genes revealed the same type of segment-dependent polymorphic site partitioning that was previously reported for Aeromonas. These results support the hypothesis that certain 16S segments in rhizobia may have a history of lateral transfer and recombination.

Key words

Agrobacterium population genetics Rhizobium systematics taxonomy 


16S rRNA

16S ribosomal ribonucleic acid


the 16S rRNA gene


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Copyright information

© Kluwer Academic Publishers 1996

Authors and Affiliations

  • B. D. Eardly
    • 1
  • F. -S. Wang
    • 1
  • P. van Berkum
    • 2
  1. 1.Department of BiologyThe Pennsylvania State UniversityUniversity ParkUSA
  2. 2.Soybean and Alfalfa Research LaboratoryUSDA-ARSBeltsvilleUSA

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