Grape Berry Acclimation to Excessive Solar Irradiance Leads to Repartitioning between Major Flavonoid Groups,Journal of Agricultural and Food Chemistry

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Grape Berry Acclimation to Excessive Solar Irradiance Leads to Repartitioning between Major Flavonoid Groups
Journal of Agricultural and Food Chemistry ( IF 5.7 ) Pub Date : 2018-01-09 00:00:00 , DOI: 10.1021/acs.jafc.7b04881
N. Reshef ₁ , N. Agam ₁ , A. Fait ₁

Affiliation

Warm viticulture regions are associated with inferior wines, resulting from the interaction between microclimate and fruit biochemistry. Solar irradiance triggers biosynthetic processes in the fruit and dominates its thermal balance. Therefore, deciphering its impact on fruit metabolism is pivotal to develop strategies for fruit protection and ameliorate its quality traits. Here, we modified light quality and intensity in the fruit-zone and integrated micrometeorology with grape and wine metabolomics, allowing a complete assessment, from field to bottle. We analyzed the dynamics of fruit’s adaptation to altered conditions during ripening and constructed temporal-based metabolic networks. Micrometeorological modifications shifted the balance between the major flavonoids, associating increased solar exposure with lower levels of anthocyanins and flavan-3-ols, and higher flavonols. Differences were fixed from 2 weeks postveraison until harvest, suggesting a controlled acclimation response rather than external modulation. Differences in grape composition manifested in the wine and resulted in higher color intensity and improved wine hue under partial shading.

中文翻译：

葡萄浆果适应过度的太阳辐射导致主要黄酮类之间的重新分配

温暖的葡萄栽培地区与劣质葡萄酒有关，这是由于小气候和水果生物化学之间的相互作用所致。太阳辐射会触发水果的生物合成过程，并主导其热平衡。因此，了解其对水果代谢的影响对于制定保护水果的策略和改善其品质特性至关重要。在这里，我们修改了水果区域的光质量和强度，并将微气象学与葡萄和葡萄酒的代谢组学相结合，从而可以进行从田间到瓶装的全面评估。我们分析了水果在成熟过程中适应变化条件的动力学，并构建了基于时间的代谢网络。微气象学的改变改变了主要类黄酮之间的平衡，将日光照射增加与花青素和黄烷-3-醇含量较低以及黄酮醇含量较高相关。从定植后2周到收获之间的差异是固定的，这表明驯化响应受到控制，而不是外部调节。在葡萄酒中表现出葡萄成分的差异，并在部分遮荫下导致更高的颜色强度和改善的葡萄酒色调。

更新日期：2018-01-09

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