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Position: Home > Articles > Effects of the severity and timing of basal leaf removal on the amino acids profiles of Sauvignon Blanc grapes and wines Journal of Integrative Agriculture 2019,18 (9)

Effects of the severity and timing of basal leaf removal on the amino acids profiles of Sauvignon Blanc grapes and wines

作者：

Yue Xiao-feng;Ju Yan-lun;Tang Zi-zhu;Zhao Ya-meng;Jiao Xu-liang;Zhang Zhen-wen

单位：

Northwest A&F Univ, Coll Enol, Yangling 712100, Shaanxi, Peoples R China;Shaanxi Engn Res Ctr Viti Viniculture, Yangling 712100, Shaanxi, Peoples R China;Sinofrench Joint Venture Dynasty Winery Ltd, Tianjin 300402, Peoples R China

关键词：

amino acid;grape;leaf removal;Sauvignon Blanc;wine

摘要：

The effects of the severity and timing of leaf removal (LR) on the amino acids of Sauvignon Blanc grapes and wines were studied during the 2017 growing season. High-performance liquid chromatography (HPLC) was used to analyze the amino acids profiles of grape berries and wines. The basal leaves were removed at three time points (40, 56 and 72 days after flowering, named LR40, LR56 and LR72, respectively) at two severity levels (one at which the first, third, and fifth basal leaves of each shoot were removed (50% level); and another at which the first six basal leaves were removed (100% level)). The results showed that leaf removal had little impact on total soluble solids (degrees Brix), titratable acidity, pH or berry weight. The LR72-50% treated grapes had higher berry weight, titratable acidity and degrees Brix than those of the other treatments. The highest concentrations of total amino acids and of total amino acids except proline were detected in LR72-50% treated grapes (2952.58 and 2764.36 mg L-1, respectively); the lowest were detected in LR72-100% treated grapes (2172.82 and 2038.71 mg L-1, respectively). LR72-50% treatment significantly promoted the synthesis of aspartic acid, serine, arginine, alanine, aminobutyric acid and proline at both severity levels for grapes, the concentrations of all of these amino acids were increased relative to the control concentrations. The LR72-50%, LR40-100% and LR72-100% treated wines had higher total amino acids concentrations and higher concentrations of some individual amino acids, such as arginine, alanine and serine, than did the control wines. Of all the amino acids studied, glycine, tyrosine, cysteine, methionine and lysine were not significantly influenced by the timing or severity basal defoliation in grapes and wines. The present study reveals the effects of the timing and severity of leaf removal on the amino acids profiles of grapes and wines.

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Effects of the severity and timing of basal leaf removal on the amino acids profiles of Sauvignon Blanc grapes and wines

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