Plant and Soil

, Volume 186, Issue 1, pp 151–159

Toward a new concept of the evolution of symbiotic nitrogen fixation in the Leguminosae

  • James A. Bryan
  • Graeme P. Berlyn
  • John C. Gordon
Article

DOI: 10.1007/BF00035069

Cite this article as:
Bryan, J.A., Berlyn, G.P. & Gordon, J.C. Plant Soil (1996) 186: 151. doi:10.1007/BF00035069

Abstract

It is generally believed that only the nodulating species of the Leguminosae fix atmospheric nitrogen; however, anatomical, ecological and taxonomic considerations indicate that non-nodulating legume species may also fix nitrogen. To test whether nitrogen-fixing symbioses in the Leguminosae might extend to the non-nodulating species, a survey of the Leguminosae was conducted: living plants of non-nodulating species were assayed using acetylene reduction. Ethylene evolution, indicating apparent nitrogenase activity, was detected in non-nodulating species representing the major taxonomic groups of Caesalpinioideae as well as in non-nodulating species of the Papilionoideae and Mimosoideae. Non-nodules nitrogen fixation appears to have provided evolutionary precursors for the nodular symbiosis in the Leguminosae.

Key words

Caesalpinioideae nitrogenase activity nodulation root cortex taxonomy 

Copyright information

© Kluwer Academic Publishers 1996

Authors and Affiliations

  • James A. Bryan
    • 1
  • Graeme P. Berlyn
    • 1
  • John C. Gordon
    • 1
  1. 1.School of Forestry and Environmental StudiesYale UniversityNew HavenUSA