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Microbial Ecology

, Volume 19, Issue 3, pp 291–302 | Cite as

TheGunnera symbiosis: DNA restriction fragment length polymorphism and protein comparisons ofNostoc symbionts

  • William J. Zimmerman
  • Birgitta Bergman
Article

Abstract

Cyanobacteria separated from symbiosis with several species of the angiospermGunnera were comparatively characterized and correlated with the locales and taxonomy of their host plants. All were identified as strains ofNostoc. Protein profiles and DNA restriction fragment length polymorphisms (from hybridizations with heterologousnifH andglnA probes) determined that three of the four cyanobacteria fromGunnera grown at one site in Sweden, each from a different host species, were very similar or identical. Plants of one species,G. manicata, grown in a second location at the site were infected with a different cyanobiont. Among five isolates from two species ofGunnera, collected in the same locale in New Zealand, three subgroups were documented. Isolates from three differentGunnera species grown in separate locations in the United States were each uniquely different. None of the cyanobacteria differed in the molecular weights of their glutamine synthetase and Fe-nitrogenase proteins. The diversity and accessibility of compatibleNostoc populations present in the soil micro-environment, not a critical selective factor required byGunnera, were concluded to be a major determinant in symbiont selection.

Keywords

Molecular Weight United States Glutamine Host Plant Nature Conservation 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag New York Inc. 1990

Authors and Affiliations

  • William J. Zimmerman
    • 1
  • Birgitta Bergman
    • 2
  1. 1.Department of Agronomy & SoilsWashington State UniversityPullmanUSA
  2. 2.Department of Physiological BotanyUniversity of UppsalaUppsalaSweden

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