Articles
LEAF AND FRUIT RESPONSES OF ´RIESLING´ GRAPEVINES TO UV-RADIATION IN THE FIELD
Article number
689_11
Pages
125 – 132
Language
English
Abstract
The effects of UV-radiation on grapevine leaf and fruit physiology under field conditions were investigated.
Selected portions of the light spectrum (within the UV wavelengths) were attenuated with polyester and di- and tri-acetate films.
The entire canopy or parts thereof were covered with these films during berry development.
Berry skin pigment composition was determined using a non-destructive spectrophotometric technique.
There was a strong UV-induced shift towards the formation of red and brown pigment components without affecting sugar levels.
Chlorophyll degradation in the leaves and berry skins occurred more rapidly in the high UV-radiation treatments.
Exposure to UV-B radiation increased both the concentration of total bound glycosidic secondary metabolites and phenolics.
There were some noticeable effects on the aromatic expression in the resulting wines.
Selected portions of the light spectrum (within the UV wavelengths) were attenuated with polyester and di- and tri-acetate films.
The entire canopy or parts thereof were covered with these films during berry development.
Berry skin pigment composition was determined using a non-destructive spectrophotometric technique.
There was a strong UV-induced shift towards the formation of red and brown pigment components without affecting sugar levels.
Chlorophyll degradation in the leaves and berry skins occurred more rapidly in the high UV-radiation treatments.
Exposure to UV-B radiation increased both the concentration of total bound glycosidic secondary metabolites and phenolics.
There were some noticeable effects on the aromatic expression in the resulting wines.
Authors
M. Lafontaine, H.R. Schultz, C. Lopes, B. Bálo, G. Varadi
Keywords
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