Interaction between Aeschynomene and photosynthetic Bradyrhizobium: An enigmatic Nod-independent symbiotic process

Bonaldi Katia, Cartieaux Fabienne, Fardoux Joël, Hannibal Laure, Bastien G., Moulin Lionel, Nouwen Nico, Prin Yves, Renier Adeline, Giraud Eric. 2008. Interaction between Aeschynomene and photosynthetic Bradyrhizobium: An enigmatic Nod-independent symbiotic process. In : 8th European Nitrogen Fixation Conference, August 30 - September 3, 2008, Gent, Belgium. s.l. : s.n., Résumé, 1 p. European Nitrogen Fixation Conference. 8, Ghent, Belgique, 30 Août 2008/3 Septembre 2008.

Résumé : Nodule formation in legume plants was assumed to be exclusively initiated by the binding of bacterial host-specific lipochitooligosaccharidic Nod factors to kinase-like receptors of the plant. Recently, sequence analysis of the genomes of two photosynthetic Bradyrhizobium strains (ORS278 and BTAi1), symbiotic of some Aeschynomene species, overturned this dogma because these bacteria lack the canonical nodulation genes (nodABC) involved in the synthesis of Nod factors [1]. This indicates that certain rhizobia use another mechanism to trigger nodule organogenesis in legumes. The most relevant characteristic of the photosynthetic Bradyrhizobium genomes will be presented. To identify the bacterial genes involved during this symbiosis, we individually screened a large Tn5 mutant library (20,000 mutants) of Bradyrhizobium ORS278 strain for their inability to induce nodules on Aeschynomene or to fix nitrogen. Results of this screening strategy will also be discussed. (Texte intégral)

Mots-clés Agrovoc : Aeschynomene, Bradyrhizobium

Classification Agris : F62 - Physiologie végétale - Croissance et développement

Auteurs et affiliations

• Bonaldi Katia, IRD (FRA)
• Cartieaux Fabienne, IRD (FRA)
• Fardoux Joël, IRD (FRA)
• Hannibal Laure, CIRAD-BIOS-UMR LSTM (FRA)
• Bastien G., CIRAD-BIOS-UMR LSTM (FRA)
• Moulin Lionel, IRD (FRA) ORCID: 0000-0001-9068-6912
• Nouwen Nico, IRD (FRA)
• Prin Yves, CIRAD-BIOS-UMR LSTM (FRA) ORCID: 0000-0002-3706-0045
• Renier Adeline, CIRAD-BIOS-UMR LSTM (FRA)
• Giraud Eric, IRD (FRA)

Source : Cirad - Agritrop (https://agritrop.cirad.fr/547525/)

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