Rhizobium sp. strain ORS571 grows synergistically on N2 and nicotinate as N sources

J Bacteriol. 1986 Jan;165(1):304-7. doi: 10.1128/jb.165.1.304-307.1986.


Rhizobium sp. strain ORS571 conducts synergistic, free-living N2 fixation and nicotinate oxidation. Explicitly, ORS571 is able to fix N2 aerobically because 6-OH-nicotinate acts as an intracellular O2 sink. Because 6-OH-nicotinate oxidation is mandatory for aerobic, free-living N2 fixation and because the synergistic processes yield ammonium from substrates (as the nitrogen source for growth), ORS571 is not a diazotroph.

Publication types

  • Research Support, U.S. Gov't, Non-P.H.S.

MeSH terms

  • Fumarates / metabolism
  • Mutation
  • Niacin / metabolism*
  • Nicotinic Acids / metabolism
  • Nitrogen / metabolism*
  • Nitrogen Fixation
  • Quaternary Ammonium Compounds / metabolism
  • Rhizobium / growth & development
  • Rhizobium / metabolism*


  • Fumarates
  • Nicotinic Acids
  • Quaternary Ammonium Compounds
  • Niacin
  • fumaric acid
  • 6-hydroxynicotinic acid
  • Nitrogen