Journal
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
Volume 48, Issue 4, Pages 1290-1297Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jf990507x
Keywords
Vitis vinifera; shade; sun exposure; glycoconjugate; aroma
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Effects of the modification of vine or bunch environment on glycoconjugatess were studied in Syrah berries over two years. Vines were shaded fi om berry set to maturity, with black polyethylene nets of different mesh size to obtain 30 and 50% of the direct sunlight. Bunches were naturally shaded by the leaves or artificially with 90% shade bags. Sun-exposed berries were chosen as control berries, A quantitative decrease in levels of glycoconjugates was observed in shaded bunches, particularly for phenolic and C-13-norisoprenoidic glycosides. In the same way, vine shading caused a decrease in the contents of glycosides of terpenols, phenols, and C-13-norisoprenoids in berries, but the grape environment (microclimate) affected the berry composition more than the vine environment. A cluster thinning experiment confirmed the independence of grapes with regard to the plant for the biosynthesis of the C-13-norisoprenoid glycosides.
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