Effects of UV exclusion on the physiology and phenolic composition of leaves and berries of Vitis vinifera cv. Graciano

BACKGROUND Ultraviolet (UV) radiation induces adaptive responses that can be used for plant production improvement. The aim of this study was to assess the effect of solar UV exclusion on the physiology and phenolic compounds of leaves and berry skins of Vitis vinifera L. cv. Graciano under field co...

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Published in:Journal of the science of food and agriculture 2015-01, Vol.95 (2), p.409-416
Main Authors: Del-Castillo-Alonso, María-Ángeles, Diago, María P, Monforte, Laura, Tardaguila, Javier, Martínez-Abaigar, Javier, Núñez-Olivera, Encarnación
Format: Article
Language:English
Subjects:
Adaptation, Physiological
Background radiation
Berries
Caffeic Acids - metabolism
carotenoids
Cell Wall - metabolism
Chemical industries
chlorophyll fluorescence
Composition effects
Cultivars
Flavanols
Flavonoids - metabolism
flavonols
Food science
Foods
Fruit - metabolism
Fruit - radiation effects
Glucosides - metabolism
Grapes
grapevine
Humans
hydroxycinnamic acids
Phenols
Phenols - analysis
Physiology
Plant Leaves - metabolism
Plant Leaves - radiation effects
stilbenes
Stress, Physiological
Sunlight
Tartrates - metabolism
Ultraviolet radiation
Ultraviolet Rays
UV radiation
vacuolar and cell wall-bound fractions
Vacuoles - metabolism
Vitis - metabolism
Vitis - radiation effects
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Summary:BACKGROUND Ultraviolet (UV) radiation induces adaptive responses that can be used for plant production improvement. The aim of this study was to assess the effect of solar UV exclusion on the physiology and phenolic compounds of leaves and berry skins of Vitis vinifera L. cv. Graciano under field conditions. Phenolic compounds were analyzed globally and individually in both the vacuolar fraction and, for the first time in grapevine, the cell wall‐bound fraction. These different locations may represent diverse modalities of phenolic response to and protection against UV. RESULTS UV exclusion led to a decrease in Fv/Fm in leaves, revealing that solar UV is needed for adequate photoprotection. Only p‐caffeoyl‐tartaric acid from the soluble fraction of leaves and myricetin‐3‐O‐glucoside from the soluble fraction of berry skins were significantly higher in the presence of UV radiation, and thus they could play a role in UV protection. Other hydroxycinnamic acids, flavonols, flavanols and stilbenes did not respond to UV exclusion. CONCLUSION UV exclusion led to subtle changes in leaves and berry skins of Graciano cultivar, which would be well adapted to current UV levels. This may help support decision‐making on viticultural practices modifying UV exposure of leaves and berries, which could improve grape and wine quality. © 2014 Society of Chemical Industry
ISSN:0022-5142
1097-0010
DOI:10.1002/jsfa.6738