Alfalfa Root Flavonoid Production Is Nitrogen Regulated.

Coronado, C.; Zuanazzi, JAS.; Sallaud, C.; Quirion, J. C.; Esnault, R.; Husson, H. P.; Kondorosi, A.; Ratet, P.

Coronado, C.; Zuanazzi, JAS.; Sallaud, C.; Quirion, J. C.; Esnault, R.; Husson, H. P.; Kondorosi, A.; Ratet, P..

Afiliación

Coronado C; Institut des Sciences Vegetales (C.C., J.A.S.Z., C.S., R.E., A.K., P.R.) and Institut de Chimie des Substances Naturelles (J.A.S.Z., J.-C.Q., H.-P.H.), Centre National de la Recherche Scientifique, Avenue de la Terrasse, F-91198, Gif sur Yvette Cedex, France.

Plant Physiol ; 108(2): 533-542, 1995 Jun.

Article en En | MEDLINE | ID: mdl-12228491

RESUMEN

Flavonoids produced by legume roots are signal molecules acting both as chemoattractants and nod gene inducers for the symbiotic Rhizobium partner. Combined nitrogen inhibits the establishment of the symbiosis. To know whether nitrogen nutrition could act at the level of signal production, we have studied the expression of flavonoid biosynthetic genes as well as the production of flavonoids in the roots of plants grown under nitrogen-limiting or nonlimiting conditions. We show here that growth of the plant under nitrogen-limiting conditions results in the enhancement of expression of the flavonoid biosynthesis genes chalcone synthase and isoflavone reductase and in an increase of root flavonoid and isoflavonoid production as well as in the Rhizobium meliloti nod gene-inducing activity of the root extract. These results indicate that in alfalfa (Medicago sativa L.) roots, the production of flavonoids can be influenced by the nitrogen nutrition of the plant.

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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Plant Physiol Año: 1995 Tipo del documento: Article País de afiliación: Francia Pais de publicación: Estados Unidos

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