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Published on June 7, 2007; 10.1104/pp.107.101337

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Received April 24, 2007
Accepted May 29, 2007

Auxin Influx Activity Is Associated with Frankia Infection during Actinorhizal Nodule Formation in Casuarina glauca

Benjamin Péret , Ranjan Swarup , Leen Jansen , Gaëlle Devos , Florence Auguy , Myriam Collin , Carole Santi , Valérie Hocher , Claudine Franche , Didier Bogusz , Malcolm Bennett , and Laurent Laplaze *

Institut de Recherche pour le Développement, Unité Mixte de Recherche Diversité et Adaptation des Plantes Cultivées (SupAgro Montpellier, Institut National de Recherche Agronomique, Institut de Recherche pour le Développement, Université Montpellier II), Equipe Rhizogenèse, 911 Avenue Agropolis, 34394 Montpellier Cedex 5, France; Division of Plant Sciences, School of Biological Sciences, University of Nottingham, Nottingham NG7 2RD, United Kingdom

* Corresponding author; email: laplaze{at}mpl.ird.fr.

Plants from the Casuarinaceae family enter symbiosis with the actinomycete Frankia leading to the formation of nitrogen-fixing root nodules. We observed that application of the auxin influx inhibitor 1-naphtoxy acetic acid (1-NOA) perturbs actinorhizal nodule formation. This suggests a potential role for auxin influx carriers in the infection process. We therefore isolated and characterized homologues of the auxin influx carriers (AUX1-LAX) genes in Casuarina glauca. Two members of this family were found to share high levels of deduced protein sequence identity with Arabidopsis AUX-LAX proteins. Complementation of the Arabidopsis aux1 mutant revealed that one of them is functionally equivalent to AUX1 and was named CgAUX1. The spatial and temporal expression pattern of CgAUX1 promoter:GUS reporter was analyzed in Casuarinaceae. We observed that CgAUX1 was expressed in plant cells infected by Frankia throughout the course of actinorhizal nodule formation. Our data suggest that auxin plays an important role during plant cell infection in actinorhizal symbioses.




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