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Experientia

, Volume 50, Issue 10, pp 874–883 | Cite as

The C4-dicarboxylate transport system ofRhizobium meliloti and its role in nitrogen fixation during symbiosis with alfalfa (Medicago sativa)

  • D. Jording
  • C. Uhde
  • R. Schmidt
  • A. Pühler
Multi-Author Reviews Symbiotic Interactions Between Microorganisms and Plants

Abstract

TheRhizobium meliloti C4-dicarboxylate transport (Dct) system is essential for an effective symbiosis with alfalfa plants. C4-dicarboxylates are the major carbon source taken up by bacteroids. Genetic analysis of Dct mutant strains led to the isolation of thedct carrier genedctA and the regulatory genesdctB anddctD. The carrier genedctA is regulated in free-living cells by the alternative sigma factor RpoN and the two-component regulatory system DctB/D. In addition, DctA is involved in its own regulation, possibly by interacting with DctB. In bacteroids, besides the DctB/DctD system an additional symbiotic activator is thought to be involved indctA expression. Further regulation ofdctA in the free-living state is reflected by diauxic growth of rhizobia, with succinate being the preferred carbon source. The tight coupling of C4-dicarboxylate transport and nitrogen fixation is revealed by a reduced level of C4-dicarboxylate transport in nitrogenase negative bacteroids.

Key words

C4-dicarboxylate transport dct genes energy source regulation Rhizobium meliloti symbiosis 

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Copyright information

© Birkhäuser Verlag 1994

Authors and Affiliations

  • D. Jording
    • 1
  • C. Uhde
    • 1
  • R. Schmidt
    • 1
  • A. Pühler
    • 1
  1. 1.Lehrstuhl für Genetik, Fakultät für BiologieUniversität BielefeldBielefeldGermany

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