title: Nitric oxide in legume-rhizobium symbiosis.
abstract: Nitric oxide (NO) is a gaseous signaling molecule with a broad spectrum of regulatory functions in plant growth and development. NO has been found to be involved in various pathogenic or symbiotic plant-microbe interactions. During the last decade, increasing evidence of the occurrence of NO during legume-rhizobium symbioses has been reported, from early steps of plant-bacteria interaction, to the nitrogen-fixing step in mature nodules. This review focuses on recent advances on NO production and function in nitrogen-fixing symbiosis. First, the potential plant and bacterial sources of NO, including NO synthase-like, nitrate reductase or electron transfer chains of both partners, are presented. Then responses of plant and bacterial cells to the presence of NO are presented in the context of the N(2)-fixing symbiosis. Finally, the roles of NO as either a regulatory signal of development, or a toxic compound with inhibitory effects on nitrogen fixation, or an intermediate involved in energy metabolism, during symbiosis establishment and nodule functioning are discussed.
authors: INRA, Laboratoire des Interactions Plantes-Microorganismes, UMR441, F-31326 Castanet-Tolosan, France.
authors: Eliane
authors: E
authors: Meilhoc
authors: Alexandre
authors: A
authors: Boscari
authors: Claude
authors: C
authors: Bruand
authors: Alain
authors: A
authors: Puppo
authors: Renaud
authors: R
authors: Brouquisse
mesh_terms: D004734:Energy Metabolism; D007887:Fabaceae / Q000235:genetics / Q000378:metabolism / Q000382:microbiology*; D018506:Gene Expression Regulation, Plant; D008954:Models, Biological; D009569:Nitric Oxide / Q000378:metabolism / Q000502:physiology*; D009586:Nitrogen Fixation; D012231:Rhizobium / Q000378:metabolism / Q000502:physiology*; D015398:Signal Transduction; D013559:Symbiosis
chemical_list: D009569:Nitric Oxide