Giraud Eric, Moulin Lionel, Vallenet D., Barbe V., Cytryn E., Avarre Jean-Christophe, Jaubert Marianne, Simon Damien, Cartieaux Fabienne, Prin Y., Béna Gilles, Hannibal Laure, Fardoux Joël, Kojadinovic M., Vuillet Laurie, Lajus A., Cruveiller S., Rouy Z., Mangenot S., Segurens B., Dossat C., Franck W. L., Chang W. S., Saunders E., Bruce D., Richardson P., Normand P., Dreyfus Bernard, Pignol D., Stacey G., Emerich D., Vermeglio A., Medigue C., Sadowsky M. (2007). Legumes symbioses : absence of Nod genes in photosynthetic bradyrhizobia. Science, 316 (5829), p. 1307-1312. ISSN 0036-8075.
Titre du document
Legumes symbioses : absence of Nod genes in photosynthetic bradyrhizobia
Année de publication
2007
Auteurs
Giraud Eric, Moulin Lionel, Vallenet D., Barbe V., Cytryn E., Avarre Jean-Christophe, Jaubert Marianne, Simon Damien, Cartieaux Fabienne, Prin Y., Béna Gilles, Hannibal Laure, Fardoux Joël, Kojadinovic M., Vuillet Laurie, Lajus A., Cruveiller S., Rouy Z., Mangenot S., Segurens B., Dossat C., Franck W. L., Chang W. S., Saunders E., Bruce D., Richardson P., Normand P., Dreyfus Bernard, Pignol D., Stacey G., Emerich D., Vermeglio A., Medigue C., Sadowsky M.
Source
Science, 2007,
316 (5829), p. 1307-1312 ISSN 0036-8075
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 lipochito-oligosaccharidic 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.
Plan de classement
Biotechnologies [084]
Localisation
Fonds IRD [F B010037972]
Identifiant IRD
fdi:010037972
