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Characterization of the adaptive response of grapevine (cv. Tempranillo) to UV-B radiation under water deficit conditions

AutorMartínez-Lüscher, Johann; Morales Iribas, Fermín ; Delrot, Serge; Sánchez-Díaz, Manuel ; Gomès, Eric; Aguirreolea, Jone; Pascual Elizalde, Inmaculada
Palabras clavePhotosynthesis
UV-B radiation
UV-B absorbing compounds
Vitis vinifera L
Water deficit
Fecha de publicaciónmar-2015
CitaciónPlant Science 232: 13-22 (2015)
ResumenThis 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 9.66 kJ m−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.
Descripción34 Pags.- 3 Tabls.- 6 Figs. The definitive version is available at: http://www.sciencedirect.com/science/journal/01689452
Versión del editorhttp://dx.doi.org/10.1016/j.plantsci.2014.12.013
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