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Article

Effect of Fruit Zone Leaf Thinning on Total Glycosides and Selected Aglycone Concentrations of Riesling (Vitis vinifera L.) Grapes

B. W. Zoecklein, T. K. Wolf, J. E. Marcy, Y. Jasinski
Am J Enol Vitic. January 1998 49: 35-43; published ahead of print January 01, 1998
B. W. Zoecklein
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T. K. Wolf
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J. E. Marcy
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Y. Jasinski
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Abstract

Selective leaf removal from fruit zones of mature Riesling grapevines grown at two northern Virginia (≈39°N) sites was evaluated over two seasons for its influence on total grape glycosides. Two to four leaves per shoot were removed three weeks after bloom from around fruit clusters grown on a high (1.8 m above ground) bilateral cordon at one vineyard, and a low (1.2 m) bilateral cordon at the other. Leaf removal increased the percentage of sunlight penetration into the canopy fruit zone in three of four measurements. The concentration of total glycosides, estimated by the analysis of glycosyl-glucose, was mostly higher in the fruit from leaf-removed vines than control vines for both the low-trained and high-trained vineyards. The sum of the concentration of selected bound monoterpene alcohols (geraniol, nerol, and linalool), and bound aromatic alcohols (benzyl alcohol and 2-phenylethanol), was also higher in fruit of leaf-removed canopies than controls at most sampling dates.

  • glycosides
  • Riesling
  • leaf removal
  • glycosyl-glucose
  • monoterpenes
  • glycoconjugates
  • Copyright 1998 by the American Society for Enology and Viticulture

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Effect of Fruit Zone Leaf Thinning on Total Glycosides and Selected Aglycone Concentrations of Riesling (Vitis vinifera L.) Grapes
B. W. Zoecklein, T. K. Wolf, J. E. Marcy, Y. Jasinski
Am J Enol Vitic.  January 1998  49: 35-43;  published ahead of print January 01, 1998

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Effect of Fruit Zone Leaf Thinning on Total Glycosides and Selected Aglycone Concentrations of Riesling (Vitis vinifera L.) Grapes
B. W. Zoecklein, T. K. Wolf, J. E. Marcy, Y. Jasinski
Am J Enol Vitic.  January 1998  49: 35-43;  published ahead of print January 01, 1998
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