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Alfalfa root flavonoid production is nitrogen regulated
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Journal Article
Alfalfa root flavonoid production is nitrogen regulated
1995
Overview
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.
Publisher
American Society of Plant Physiologists
Subject
/ Alfalfa
/ azote
/ Biological and medical sciences
/ disponibilidad de nutrientes
/ disponibilite d' element nutritif
/ Fundamental and applied biological sciences. Psychology
/ gene
/ genes
/ Metabolism. Physicochemical requirements
/ naringenin-chalcone synthase
/ Nitrogen
/ Plant physiology and development
/ Plant-Microbe and Plant-Insect Interactions
/ Plants
/ racine
/ raices
/ roots
/ symbiose
/ variete
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