ISHS Acta Horticulturae 689: VII International Symposium on Grapevine Physiology and Biotechnology
LEAF AND FRUIT RESPONSES OF ´RIESLING´ GRAPEVINES TO UV-RADIATION IN THE FIELD |
| Authors: | M. Lafontaine, H.R. Schultz, C. Lopes, B. Bálo, G. Varadi |
| 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. | |
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