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1 Agriculture Canada Research Station, Summerland, British Columbia, Canada V0H 1Z0.
Gewürztraminer berries were sampled over two seasons between veraison and commercial harvest, from fully exposed (E), partially shaded (P), and totally shaded (S) clusters. Berry weight was highest both seasons throughout the sampling periods in P clusters and lowest in E or S fruit. Soluble solids (°Brix) accumulation and acid degradation in S berries were delayed until one week before harvest in 1985 and throughout the entire 1986 sampling period. In 1986, pH was highest in E berries throughout, but in 1985, pH was highest in E fruit only until the latter stages of ripening, where it plateaued in E berries and continued to rise in P and S fruit. Glycosidically-bound monoterpenes and polyols (potentially volatile terpenes; PVT) were maintained during both seasons at highest levels in E berries throughout the sampling periods and were considerably higher than P and S fruit at final harvest. PVT attained maximum concentration in E fruit three weeks before commercial harvest. Free volatile terpenes (FVT) tended to be highest in E and P fruit.
Key words: Vitis vinifera, aroma, flavor, terpenes, fruit exposure, light
Submitted on October 12, 1988
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