Auxin carriers localization drives auxin accumulation in plant cells infected by Frankia in Casuarina glauca actinorhizal nodules
2010
Perrine-Walker , Francine (INRA , Mauguio (France). UMR 1097 Diversité et Adaptation des Plantes Cultivées) | Doumas , Patrick (INRA , Montpellier (France). UMR 0386 Biochimie et Physiologie Moléculaire des Plantes) | Lucas , Michaël (INRA , Mauguio (France). UMR 1097 Diversité et Adaptation des Plantes Cultivées) | Vaissayre , Virginie (INRA , Mauguio (France). UMR 1097 Diversité et Adaptation des Plantes Cultivées) | Beauchemin , Nicholas J. (University of New Hampshire(Etats-Unis). Department of Cellular, Molecular and Biomedical Sciences) | Band , Leah R. (University of Nottingham(Royaume Uni). Centre for Plant Integrative Biology) | Chopard , Jérôme (INRA , Montpellier (France). UMR 1098 Développement et Amélioration des Plantes) | Crabos , Amandine (INRA , Mauguio (France). UMR 1097 Diversité et Adaptation des Plantes Cultivées) | Conejero , Geneviève (Centre de Coopération Internationale en Recherche Agronomique pour le Développement(France). Plate-forme d’Histocytologie et d’Imagerie cellulaire Végétale) | Péret , Benjamin (INRA , Mauguio (France). UMR 1097 Diversité et Adaptation des Plantes Cultivées) | King , John R. (University of Nottingham(Royaume Uni). Centre for Plant Integrative Biology) | Verdeil , Jean Luc (Centre de Coopération Internationale en Recherche Agronomique pour le Développement(France). Plate-forme d’Histocytologie et d’Imagerie cellulaire Végétale) | Hocher , Valérie (INRA , Mauguio (France). UMR 1097 Diversité et Adaptation des Plantes Cultivées) | Franche , Claudine (INRA , Mauguio (France). UMR 1097 Diversité et Adaptation des Plantes Cultivées) | Bennett , Malcolm J. (University of Nottingham(Royaume Uni). Centre for Plant Integrative Biology) | Tisa , Louis S. (University of New Hampshire(Etats-Unis). Department of Cellular, Molecular and Biomedical Sciences) | Laplaze , Laurent (INRA , Mauguio (France). UMR 1097 Diversité et Adaptation des Plantes Cultivées)
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.
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