Legumes symbioses : Absence of Nod genes in photosynthetic bradyrhizobia

Giraud Eric, Moulin Lionel, Vallenet David, Barbe Valérie, Cytryn Eddie, Avarre Jean-Christophe, Jaubert Marianne, Simon Damien, Cartieaux Fabienne, Prin Yves, Béna Gilles, Hannibal Laure, Fardoux Joël, Kojadinovic Mila, Vuillet Laurie, Lajus Aurélie, Cruveiller Stéphane, Rouy Zoe, Mangenot Sophie, Segurens Béatrice, Dossat Carole, Franck William L., Chang Woo-Suk, Saunders Elizabeth, Bruce David, Richardson Paul, Normand Philippe, Dreyfus Bernard, Pignol David, Stacey Gary, Emerich David, Vermeglio André, Medigue Claudine, Sadowsky Michael. 2007. Legumes symbioses : Absence of Nod genes in photosynthetic bradyrhizobia. Science, 316 (5829) : pp. 1307-1312.

Journal article ; Article de revue à facteur d'impact
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Liste HCERES des revues (en SHS) : oui

Thème(s) HCERES des revues (en SHS) : Anthropologie-Ethnologie; Economie-gestion; Psychologie-éthologie-ergonomie; Sociologie-démographie

Abstract : Leguminous plants (such as peas and soybeans) and rhizobial soil bacteria are symbiotic partners that communicate through molecular signaling pathways, resulting in the formation of nodules on legume roots and occasionally stems that house nitrogen-fixing bacteria. Nodule formation has been assumed to be exclusively initiated by the binding of bacterial, host-specific lipochito-oligosaccharidic Nod factors, encoded by the nodABC genes, to kinase-like receptors of the plant. Here we show by complete genome sequencing of two symbiotic, photosynthetic, Bradyrhizobium strains, BTAi1 and ORS278, that canonical nodABC genes and typical lipochitooligosaccharidic Nod factors are not required for symbiosis in some legumes. Mutational analyses indicated that these unique rhizobia use an alternative pathway to initiate symbioses, where a purine derivative may play a key role in triggering nodule formation. (Résumé d'auteur)

Mots-clés Agrovoc : Fabaceae, Symbiose, Formation de nodosités, nodosité racinaire, Bradyrhizobium, Bradyrhizobium japonicum, Rhizobactérie, Biologie moléculaire, Génome, Séquence nucléotidique, Mutant

Mots-clés complémentaires : Aeschynomene sensitiva

Classification Agris : P34 - Soil biology
F30 - Plant genetics and breeding

Champ stratégique Cirad : Axe 1 (2005-2013) - Intensification écologique

Auteurs et affiliations

  • Giraud Eric, IRD (FRA)
  • Moulin Lionel, IRD (FRA) ORCID: 0000-0001-9068-6912
  • Vallenet David, Centre national de séquençage (FRA)
  • Barbe Valérie, Centre national de séquençage (FRA)
  • Cytryn Eddie, University of Minnesota (USA)
  • Avarre Jean-Christophe, IRD (FRA)
  • Jaubert Marianne, INRA (FRA)
  • Simon Damien, CIRAD-BIOS-UMR LSTM (FRA)
  • Cartieaux Fabienne, IRD (FRA)
  • Prin Yves, CIRAD-BIOS-UMR LSTM (FRA) ORCID: 0000-0002-3706-0045
  • Béna Gilles, IRD (FRA)
  • Hannibal Laure, UM2 (FRA)
  • Fardoux Joël, IRD (FRA)
  • Kojadinovic Mila, CEA (FRA)
  • Vuillet Laurie, CIRAD-BIOS-UMR LSTM (FRA)
  • Lajus Aurélie, Centre national de séquençage (FRA)
  • Cruveiller Stéphane, Centre national de séquençage (FRA)
  • Rouy Zoe, Centre national de séquençage (FRA)
  • Mangenot Sophie, Centre national de séquençage (FRA)
  • Segurens Béatrice, Centre national de séquençage (FRA)
  • Dossat Carole, Centre national de séquençage (FRA)
  • Franck William L., University of Missouri (USA)
  • Chang Woo-Suk, University of Missouri (USA)
  • Saunders Elizabeth, Department of Energy (USA)
  • Bruce David, Department of Energy (USA)
  • Richardson Paul, Department of Energy (USA)
  • Normand Philippe, CNRS (FRA)
  • Dreyfus Bernard, IRD (FRA)
  • Pignol David, CEA (FRA)
  • Stacey Gary, University of Missouri (USA)
  • Emerich David, University of Missouri (USA)
  • Vermeglio André, CEA (FRA)
  • Medigue Claudine, Centre national de séquençage (FRA)
  • Sadowsky Michael, University of Minnesota (USA)

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