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Characterization of a Casuarina glauca Nodule-Specific Subtilisin-like Protease Gene, a Homolog of Alnus glutinosa ag12

January 2000 , Volume 13 , Number  1
Pages  113 - 117

Laurent Laplaze , 1 Ana Ribeiro , 2 Claudine Franche , 1 Emile Duhoux , 1 Florence Auguy , 1 Didier Bogusz , 1 and Katharina Pawlowski 2 , 3

1Physiologie Cellulaire et Moléculaire des Arbres, Laboratoire GeneTrop, IRD, 911 avenue Agropolis, 34032 Montpellier Cedex 01, France; 2Department of Molecular Biology, Dreijenlaan 3, Agricultural University, 6703 HA Wageningen, The Netherlands; 3Albrecht-von-Haller-Institut für Pflanzenwissenschaften, Biochemie der Pflanze, Universität Göttingen, Untere Karspüle 2, D-37073 Göttingen, Germany

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Accepted 24 September 1999.

In search of plant genes expressed during early interactions between Casuarina glauca and Frankia, we have isolated and characterized a C. glauca gene that has strong homology to subtilisin-like protease gene families of several plants including the actinorhizal nodulin gene ag12 of another actinorhizal plant, Alnus glutinosa. Based on the expression pattern of cg12 in the course of nodule development, it represents an early actinorhizal nodulin gene. Our results suggest that subtilisin-like proteases may be a common element in the process of infection of plant cells by Frankia in both Betulaceae (Alnus glutinosa) and Casuarinaceae (Casuarina glauca) symbioses.

Additional keyword: symbiosis.

The American Phytopathological Society, 2000