Plant Physiology Preview
Published on July 14, 2006; 10.1104/pp.106.084657
Received June 4, 2006
Accepted July 8, 2006
The Medicago truncatula LysM-receptor Kinase Gene Family Includes NFP and New Nodule-expressed Genes
Jean-François Arrighi , Annick Barre , Besma Ben Amor , Anne Bersoult , Lidia Campos Soriano , Rossana Mirabella , Fernanda de Carvalho-Niebel , Etienne-Pascal Journet , Michèle Ghérardi , Thierry Huguet , René Geurts , Jean Dénarié , Pierre Rougé , and Clare Gough *
Laboratoire des Interactions Plantes-Microorganismes, INRA-CNRS UMR 441/2564, BP52627, 31326 Castanet-Tolosan, France
Surfaces Cellulaires et Signalisation chez les Végétaux, CNRS-UPS UMR 5546, Pôle de Biotechnologie Végétale, BP42617, 31326 Castanet-Tolosan, France
Laboratory of Molecular Biology, Wageningen University, Dreijenlaan 3, 6703HA Wageningen, Netherlands
Laboratoire des Interactions Plantes-Microorganismes, INRA-CNRS UMR 441/2564, BP52627, 31326 Castanet-Tolosan, France; Laboratoire Biotechnologies et Amélioration des Plantes, E.N.S.A. Toulouse, BP32607 Auzeville, 31326 Castanet-Tolosan, France
* Corresponding author; email: gough{at}toulouse.inra.fr.
Rhizobial Nod factors are key symbiotic signals responsible for starting the nodulation process in host legume plants. Of the six Medicago truncatula genes controlling a Nod factor signalling pathway, NFP was reported as a candidate Nod factor receptor gene. Here, we provide further evidence for this by showing that NFP is a LysM receptor-like kinase (LysM-RLK). NFP was shown both to be expressed in association with infection thread development and to be involved in the infection process. Consistent with deviations from conserved kinase domain sequences, NFP did not show autophosphorylation activity, suggesting that NFP needs to associate with an active kinase or has unusual functional characteristics different from classical kinases. Identification of nine new M. truncatula LysM-RLK genes revealed a larger family than in the non-legumes Arabidopsis thaliana or rice, of at least 17 members that can be divided into three sub-families. Three LysM domains could be structurally predicted for all M. truncatula LysM-RLK proteins, while one sub-family, which includes NFP, was characterised by deviations from conserved kinase sequences. Most of the newly identified genes were found to be expressed in roots and nodules, suggesting this class of receptors may be more extensively involved in nodulation than was previously known.
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