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Legumes can enter into symbiotic relationships with both nitrogen-fixingbacteria (rhizobia) and mycorrhizal fungi. Nodulation by rhizobiaresults from a signal transduction pathway induced in legumeroots by rhizobial Nod factors. DMI3, a Medicago truncatulagene that acts immediately downstream of calcium spiking inthis signaling pathway and is required for both nodulation andmycorrhizal infection, has high sequence similarity to genesencoding calcium and calmodulin-dependent protein kinases (CCaMKs).This indicates that calcium spiking is likely an essential componentof the signaling cascade leading to nodule development and mycorrhizalinfection, and sheds light on the biological role of plant CCaMKs.
1 Laboratoire des Interactions PlantesMicroorganismes INRA-CNRS, BP27, 31326 Castanet-Tolosan Cedex, France. 2 Laboratory of Molecular Biology, Department of Plant Sciences, Wageningen University, Dreijenlaan 3, 6703HA Wageningen, Netherlands. 3 Unité de Recherches en Génomique Végétale INRA, 2 rue Gaston Crémieux, CP 5708, F-91057 Evry Cedex, France. 4 Unité de Recherche de Génétique et Ecophysiologie des Légumineuses INRA, BP 86510, 21065 Dijon Cedex, France.
* These authors contributed equally to this work.
To whom correspondence should be addressed. E-mail: debelle{at}toulouse.inra.fr
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