Host-Plant Invasion by Rhizobia

  • V. Viprey
  • X. Perret
  • W. J. Broughton
Part of the Subcellular Biochemistry book series (SCBI, volume 33)


Colonization of legume roots by compatible soil bacteria of the genera Azorhizobium, Bradyrhizobium, Mesorhizobium, Rhizobium and Sinorhizobium (collectively known as rhizobia) leads to the formation of specialized nitrogen-fixing organs called nodules. Signals produced by both partners control specificity. Flavonoids found in root exudates trigger the expression of the rhizobial genes (nod, nol, noe) required for nodulation (Fellay et al., 1995). Many nod loci are involved in the synthesis and secretion of Nod-factors, a family of complex lipo-chito-oligosaccharides (Hanin et al., 1998b; Dénarié et al., 1996). Nod-factors initiate division of nodule meristems and permit entry of rhizobia into the host-plant (Relic et al., 1994).


Capsular Polysaccharide Rhizobium Leguminosarum Nodule Development Infection Thread Indeterminate Nodule 
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Copyright information

© Springer Science+Business Media New York 2000

Authors and Affiliations

  • V. Viprey
    • 1
  • X. Perret
    • 1
  • W. J. Broughton
    • 1
  1. 1.Laboratoire de Biologie Moléculaire des Plantes Supérieures (LBMPS)Université de GenèveChambéry/GenèveSwitzerland

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