Background and Aims The climate‐change driven uncoupling of grape (Vitis vinifera L.) berry ‘sugar‐ripeness’ and ‘flavour‐ripeness’ necessitates an improved understanding of the sugar/flavour nexus. Methods and Results Analysis of grape metabolites and wine volatiles derived from Riesling berries of peduncle‐girdled and Control bunches over the course of 30 days provided time‐dependent insights into changes to grape and wine composition associated with phloem import. Girdling resulted in stable berry mass and concentration of sugar and cytokinin and in reduced concentration of amino acids. Such changes to grape composition correlated with a lasting increase in wine monoterpenoids and a transient reduction in fermentation‐derived wine volatiles. Conclusions Oxidative stress and restricted amino acid import, not sugar accumulation, were identified as possible elicitors for the increased accumulation of varietal wine aroma compounds in Riesling. Significance of the Study The concentration and composition of berry amino acids and cytokinin concentration in grapes during the later stages of rapid sugar accumulation may represent potential targets for vineyard management strategies and grapevine breeding to counter climate‐change driven modifications to the wine volatile profile of aromatic cultivars.

中文翻译：

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韧皮部进口到雷司令 (Vitis vinifera L.) 浆果中的后变化限制诱导发酵衍生和品种葡萄酒挥发物的短暂和稳定变化

背景和目标气候变化驱动的葡萄 (Vitis vinifera L.) 浆果“糖成熟度”和“风味成熟度”的解耦需要更好地了解糖/风味关系。方法和结果在 30 天的过程中，对来自花梗环带和对照串雷司令浆果的葡萄代谢物和葡萄酒挥发物的分析提供了与韧皮部进口相关的葡萄和葡萄酒成分变化的时间依赖性见解。环剥导致稳定的浆果质量和糖和细胞分裂素的浓度以及氨基酸浓度的降低。葡萄成分的这种变化与葡萄酒单萜类化合物的持续增加和发酵衍生的葡萄酒挥发物的短暂减少相关。结论 氧化应激和限制氨基酸输入，而不是糖积累，被确定为雷司令中品种葡萄酒香气化合物积累增加的可能诱因。研究的意义 在快速糖分积累的后期阶段，葡萄中浆果氨基酸和细胞分裂素浓度的浓度和组成可能代表葡萄园管理策略和葡萄育种的潜在目标，以应对气候变化驱动的葡萄酒香气挥发谱的改变。品种。