title: An exogenous source of nitric oxide modulates zinc nutritional status in wheat plants.
abstract: The effect of addition of the nitric oxide donor S-nitrosoglutathione (GSNO) on the Zn nutritional status was evaluated in hydroponically-cultured wheat plants (Triticum aestivum cv. Chinese Spring). Addition of GSNO in Zn-deprived plants did not modify biomass accumulation but accelerated leaf senescence in a mode concomitant with accelerated decrease of Zn allocation to shoots. In well-supplied plants, Zn concentration in both roots and shoots declined due to long term exposure to GSNO. A further evaluation of net Zn uptake rate (ZnNUR) during the recovery of long-term Zn-deprivation unveiled that enhanced Zn-accumulation was partially blocked when GSNO was present in the uptake medium. This effect on uptake was mainly associated with a change of Zn translocation to shoots. Our results suggest a role for GSNO in the modulation of Zn uptake and in root-to-shoot translocation during the transition from deficient to sufficient levels of Zn-supply.
authors.affiliation: Instituto de Fisiología Vegetal (INFIVE), Universidad Nacional de La Plata (UNLP) and Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Diagonal 113 y 61, La Plata, Buenos Aires 1900, Argentina.
authors.forename: Agustina
authors.initials: A
authors.lastname: Buet
authors.affiliation: Instituto Tecnológico Chascomús (IIB-INTECH), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) and Universidad Nacional de San Martín, Av. Intendente Marino Km 8.2, Chascomús, Buenos Aires 7130, Argentina.
authors.forename: Jorge I
authors.initials: JI
authors.lastname: Moriconi
authors.affiliation: Instituto Tecnológico Chascomús (IIB-INTECH), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) and Universidad Nacional de San Martín, Av. Intendente Marino Km 8.2, Chascomús, Buenos Aires 7130, Argentina.
authors.forename: Guillermo E
authors.initials: GE
authors.lastname: Santa-María
authors.affiliation: Instituto de Fisiología Vegetal (INFIVE), Universidad Nacional de La Plata (UNLP) and Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Diagonal 113 y 61, La Plata, Buenos Aires 1900, Argentina. Electronic address: marcelasimontacchi@agro.unlp.edu.ar.
authors.forename: Marcela
authors.initials: M
authors.lastname: Simontacchi
mesh_terms: D001693:Biological Transport, Active / Q000187:drug effects; D064426:Gasotransmitters / Q000494:pharmacology*; D009569:Nitric Oxide / Q000494:pharmacology*; D009603:Nitroso Compounds / Q000494:pharmacology*; D018515:Plant Leaves / Q000378:metabolism; D018520:Plant Shoots / Q000378:metabolism; D014908:Triticum / Q000378:metabolism*; D015032:Zinc / Q000378:metabolism*
chemical_list: D064426:Gasotransmitters; D009603:Nitroso Compounds; D009569:Nitric Oxide; D015032:Zinc
keywords: Nitric oxide; Triticum aestivum; Wheat; Zinc