title: Characterization of the adaptive response of grapevine (cv. Tempranillo) to UV-B radiation under water deficit conditions.
abstract: This work aims to characterize the physiological response of grapevine (Vitis vinifera L.) cv. Tempranillo to UV-B radiation under water deficit conditions. Grapevine fruit-bearing cuttings were exposed to three levels of supplemental biologically effective UV-B radiation (0, 5.98 and 9.66kJm(-2)day(-1)) and two water regimes (well watered and water deficit), in a factorial design, from fruit-set to maturity under glasshouse-controlled conditions. UV-B induced a transient decrease in net photosynthesis (Anet), actual and maximum potential efficiency of photosystem II, particularly on well watered plants. Methanol extractable UV-B absorbing compounds (MEUVAC) concentration and superoxide dismutase activity increased with UV-B. Water deficit effected decrease in Anet and stomatal conductance, and did not change non-photochemical quenching and the de-epoxidation state of xanthophylls, dark respiration and photorespiration being alternative ways to dissipate the excess of energy. Little interactive effects between UV-B and drought were detected on photosynthesis performance, where the impact of UV-B was overshadowed by the effects of water deficit. Grape berry ripening was strongly delayed when UV-B and water deficit were applied in combination. In summary, deficit irrigation did not modify the adaptive response of grapevine to UV-B, through the accumulation of MEUVAC. However, combined treatments caused additive effects on berry ripening.
authors.affiliation: Grupo de Fisiología del Estrés en Plantas (Dpto. de Biología Ambiental), Unidad Asociada al CSIC, EEAD, Zaragoza e ICVV, Logroño, Facultades de Ciencias y Farmacia, Universidad de Navarra, Irunlarrea 1, 31008 Pamplona, Spain; INRA, Institut des Sciences de la Vigne et du Vin, UMR1287 EGFV, 210 Chemin de Leysotte, 33883 Villenave D'Ornon, France; University of Bordeaux, Institut des Sciences de la Vigne et du Vin, UMR1287 EGFV, 210 Chemin de Leysotte, 33883 Villenave D'Ornon, France.
authors.forename: J
authors.initials: J
authors.lastname: Martínez-Lüscher
authors.affiliation: Estación Experimental de Aula Dei (EEAD), CSIC, Dpto. Nutrición Vegetal, Apdo. 13034, 50080 Zaragoza, Spain; Grupo de Fisiología del Estrés en Plantas (Dpto. de Biología Ambiental), Unidad Asociada al CSIC, EEAD, Zaragoza e ICVV, Logroño, Facultades de Ciencias y Farmacia, Universidad de Navarra, Irunlarrea 1, 31008 Pamplona, Spain.
authors.forename: F
authors.initials: F
authors.lastname: Morales
authors.affiliation: INRA, Institut des Sciences de la Vigne et du Vin, UMR1287 EGFV, 210 Chemin de Leysotte, 33883 Villenave D'Ornon, France; University of Bordeaux, Institut des Sciences de la Vigne et du Vin, UMR1287 EGFV, 210 Chemin de Leysotte, 33883 Villenave D'Ornon, France.
authors.forename: S
authors.initials: S
authors.lastname: Delrot
authors.affiliation: Grupo de Fisiología del Estrés en Plantas (Dpto. de Biología Ambiental), Unidad Asociada al CSIC, EEAD, Zaragoza e ICVV, Logroño, Facultades de Ciencias y Farmacia, Universidad de Navarra, Irunlarrea 1, 31008 Pamplona, Spain.
authors.forename: M
authors.initials: M
authors.lastname: Sánchez-Díaz
authors.affiliation: INRA, Institut des Sciences de la Vigne et du Vin, UMR1287 EGFV, 210 Chemin de Leysotte, 33883 Villenave D'Ornon, France; University of Bordeaux, Institut des Sciences de la Vigne et du Vin, UMR1287 EGFV, 210 Chemin de Leysotte, 33883 Villenave D'Ornon, France.
authors.forename: E
authors.initials: E
authors.lastname: Gomès
authors.affiliation: Grupo de Fisiología del Estrés en Plantas (Dpto. de Biología Ambiental), Unidad Asociada al CSIC, EEAD, Zaragoza e ICVV, Logroño, Facultades de Ciencias y Farmacia, Universidad de Navarra, Irunlarrea 1, 31008 Pamplona, Spain.
authors.forename: J
authors.initials: J
authors.lastname: Aguirreolea
authors.affiliation: Grupo de Fisiología del Estrés en Plantas (Dpto. de Biología Ambiental), Unidad Asociada al CSIC, EEAD, Zaragoza e ICVV, Logroño, Facultades de Ciencias y Farmacia, Universidad de Navarra, Irunlarrea 1, 31008 Pamplona, Spain. Electronic address: ipascual@unav.es.
authors.forename: I
authors.initials: I
authors.lastname: Pascual
mesh_terms: D002734:Chlorophyll / Q000378:metabolism; D003890:Desiccation; D015227:Lipid Peroxidation / Q000528:radiation effects; D010788:Photosynthesis / Q000528:radiation effects; D054046:Plant Stomata / Q000528:radiation effects; D013482:Superoxide Dismutase / Q000378:metabolism; D014466:Ultraviolet Rays; D027843:Vitis / Q000378:metabolism / Q000502:physiology / Q000528:radiation effects*; D014867:Water / Q000378:metabolism
chemical_list: D014867:Water; D002734:Chlorophyll; D013482:Superoxide Dismutase
keywords: Phenology; Photosynthesis; UV-B absorbing compounds; UV-B radiation; Vitis vinifera L.; Water deficit