Auxin carriers localization drives auxin accumulation in plant cells infected by Frankia in Casuarina glauca actinorhizal nodules

Perrine-Walker Francine, Doumas Patrick, Lucas Mikaël, Vaissayre Virginie, Bauchemin Nicholas, Band Leah, Chopard Jérôme, Crabos Amandine, Conejero Geneviève, Péret Benjamin, King John, Verdeil Jean-Luc, Hocher Valérie, Franche Claudine, Bennett Malcolm J., Tisa Louis, Laplaze Laurent. 2010. Auxin carriers localization drives auxin accumulation in plant cells infected by Frankia in Casuarina glauca actinorhizal nodules. Plant Physiology, 154 (3) : pp. 1372-1380.

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Quartile : Outlier, Sujet : PLANT SCIENCES

Abstract : Actinorhizal symbioses are mutualistic interactions between plants and the soil bacteria Frankia that lead to the formation of nitrogen-fixing root nodules. Little is known about the signaling mechanisms controlling the different steps of the establishment of the symbiosis. The plant hormone auxin has been suggested to play a role. Here we report that auxin accumulates within Frankia-infected cells in actinorhizal nodules of Casuarina glauca. Using a combination of computational modeling and experimental approaches, we establish that this localized auxin accumulation is driven by the cell-specific expression of auxin transporters and by Frankia auxin biosynthesis in planta. Our results indicate that the plant actively restricts auxin accumulation to Frankia-infected cells during the symbiotic interaction. (Résumé d'auteur)

Mots-clés Agrovoc : Frankia, Casuarina, Auxine, Symbiose, Modèle de simulation, Biologie moléculaire, Biologie, Interactions biologiques, Fixation de l'azote, Micro-organisme du sol

Mots-clés complémentaires : Casuarina glauca

Classification Agris : F62 - Plant physiology - Growth and development
H20 - Plant diseases
P34 - Soil biology

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

Auteurs et affiliations

  • Perrine-Walker Francine, IRD (FRA)
  • Doumas Patrick, IRD (FRA)
  • Lucas Mikaël, University of Nottingham (GBR)
  • Vaissayre Virginie, IRD (FRA)
  • Bauchemin Nicholas, University of New Hampshire (USA)
  • Band Leah, University of Nottingham (GBR)
  • Chopard Jérôme, INRIA (FRA)
  • Crabos Amandine, IRD (FRA)
  • Conejero Geneviève, INRA (FRA)
  • Péret Benjamin, University of Nottingham (GBR)
  • King John, University of Nottingham (GBR)
  • Verdeil Jean-Luc, CIRAD-BIOS-UMR DAP (FRA)
  • Hocher Valérie, IRD (FRA)
  • Franche Claudine, IRD (FRA)
  • Bennett Malcolm J., University of Nottingham (GBR)
  • Tisa Louis, University of New Hampshire (USA)
  • Laplaze Laurent, IRD (FRA)

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