Impact of Leaf Removal, Applied Before and After Flowering, on Anthocyanin, Tannin, and Methoxypyrazine Concentrations in ‘Merlot’ (Vitis vinifera L.) Grapes and Wines

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• 作者：Paolo Sivilotti ; Jose Carlos Herrera ; Klemen Lisjak ; Helena Baša Česnik ; Paolo Sabbatini ; Enrico Peterlunger ; Simone Diego Castellarin
• 刊名：Journal of Agricultural and Food Chemistry
• 出版年：2016
• 出版时间：June 8, 2016
• 年：2016
• 卷：64
• 期：22
• 页码：4487-4496
• 全文大小：380K
• 年卷期：0
• ISSN：1520-5118

文摘

The development and accumulation of secondary metabolites in grapes determine wine color, taste, and aroma. This study aimed to investigate the effect of leaf removal before flowering, a practice recently introduced to reduce cluster compactness and Botrytis rot, on anthocyanin, tannin, and methoxypyrazine concentrations in ‘Merlot’ grapes and wines. Leaf removal before flowering was compared with leaf removal after flowering and an untreated control. No effects on tannin and anthocyanin concentrations in grapes were observed. Both treatments reduced levels of 3-isobutyl-2-methoxypyrazine (IBMP) in the grapes and the derived wines, although the after-flowering treatment did so to a greater degree in the fruit specifically. Leaf removal before flowering can be used to reduce cluster compactness, Botrytis rot, and grape and wine IBMP concentration and to improve wine color intensity but at the expense of cluster weight and vine yield. Leaf removal after flowering accomplishes essentially the same results without loss of yield.