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

Benjamin Péret | Zendy; Ranjan Swarup | Zendy; Leen Jansen | Zendy; Gaëlle Devos | Zendy; Florence Auguy | Zendy; Myriam Collin | Zendy; Carole Santi | Zendy; Valérie Hocher | Zendy; Claudine Franche | Zendy; Didier Bogusz | Zendy; Malcolm J. Bennett | Zendy; Laurent Laplaze | Zendy

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

Author(s) -

Benjamin Péret,

Ranjan Swarup,

Leen Jansen,

Gaëlle Devos,

Florence Auguy,

Myriam Collin,

Carole Santi,

Valérie Hocher,

Claudine Franche,

Didier Bogusz,

Malcolm J. Bennett,

Laurent Laplaze

Publication year - 2007

Publication title -

plant physiology

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 3.554

H-Index - 312

eISSN - 1532-2548

pISSN - 0032-0889

DOI - 10.1104/pp.107.101337

Subject(s) - frankia , actinorhizal plant , biology , arabidopsis , auxin , arabidopsis thaliana , botany , root nodule , symbiosis , microbiology and biotechnology , mutant , gene , genetics , bacteria

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-naphtoxyacetic acid perturbs actinorhizal nodule formation. This suggests a potential role for auxin influx carriers in the infection process. We therefore isolated and characterized homologs of the auxin influx carrier (AUX1-LAX) genes in Casuarina glauca. Two members of this family were found to share high levels of deduced protein sequence identity with Arabidopsis (Arabidopsis thaliana) 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:beta-glucuronidase 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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