title: Climate change conditions (elevated CO2 and temperature) and UV-B radiation affect grapevine (Vitis vinifera cv. Tempranillo) leaf carbon assimilation, altering fruit ripening rates.
abstract: The increase in grape berry ripening rates associated to climate change is a growing concern for wine makers as it rises the alcohol content of the wine. The present work studied the combined effects of elevated CO2, temperature and UV-B radiation on leaf physiology and berry ripening rates. Three doses of UV-B: 0, 5.98, 9.66 kJm(-2)d(-1), and two CO2-temperature regimes: ambient CO2-24/14 °C (day/night) (current situation) and 700 ppm CO2-28/18 °C (climate change) were imposed to grapevine fruit-bearing cuttings from fruit set to maturity under greenhouse-controlled conditions. Photosynthetic performance was always higher under climate change conditions. High levels of UV-B radiation down regulated carbon fixation rates. A transient recovery took place at veraison, through the accumulation of flavonols and the increase of antioxidant enzyme activities. Interacting effects between UV-B and CO2-temperature regimes were observed for the lipid peroxidation, which suggests that UV-B may contribute to palliate the signs of oxidative damage induced under elevated CO2-temperature. Photosynthetic and ripening rates were correlated. Thereby, the hastening effect of climate change conditions on ripening, associated to higher rates of carbon fixation, was attenuated by UV-B radiation.
authors.affiliation: Universidad de Navarra, Grupo de Fisiología del Estrés en Plantas (Dpto. Biología Ambiental), Unidad Asociada al CSIC, EEAD, Zaragoza e ICVV, Logroño, 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: Universidad de Navarra, Grupo de Fisiología del Estrés en Plantas (Dpto. Biología Ambiental), Unidad Asociada al CSIC, EEAD, Zaragoza e ICVV, Logroño, Irunlarrea, 1, 31008, Pamplona, Spain; Estación Experimental de Aula Dei (EEAD), CSIC, Dpto. Nutrición Vegetal, Apdo. 13034, 50080 Zaragoza, Spain.
authors.forename: F
authors.initials: F
authors.lastname: Morales
authors.affiliation: Universidad de Navarra, Grupo de Fisiología del Estrés en Plantas (Dpto. Biología Ambiental), Unidad Asociada al CSIC, EEAD, Zaragoza e ICVV, Logroño, 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: S
authors.initials: S
authors.lastname: Delrot
authors.affiliation: Universidad de Navarra, Grupo de Fisiología del Estrés en Plantas (Dpto. Biología Ambiental), Unidad Asociada al CSIC, EEAD, Zaragoza e ICVV, Logroño, Irunlarrea, 1, 31008, Pamplona, Spain.
authors.forename: J
authors.initials: J
authors.lastname: Aguirreolea
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: Universidad de Navarra, Grupo de Fisiología del Estrés en Plantas (Dpto. Biología Ambiental), Unidad Asociada al CSIC, EEAD, Zaragoza e ICVV, Logroño, Irunlarrea, 1, 31008, Pamplona, Spain. Electronic address: ipascual@unav.es.
authors.forename: I
authors.initials: I
authors.lastname: Pascual
mesh_terms: D002244:Carbon / Q000378:metabolism; D002245:Carbon Dioxide / Q000378:metabolism*; D057231:Climate Change; D005638:Fruit / Q000254:growth & development; D018515:Plant Leaves / Q000378:metabolism; D013696:Temperature; D014466:Ultraviolet Rays; D027843:Vitis / Q000502:physiology* / Q000528:radiation effects
chemical_list: D002245:Carbon Dioxide; D002244:Carbon
keywords: Carbon assimilation; Climate change; Cross tolerance; Grapevine; Ripening; UV-B radiation