Abstract：
Adopting disease-tolerant grapevines is an efficient option to implement a smarter management strategy limiting the environmental impacts linked to pesticide use. However, little is known on their production of fruit metabolites regarding expected future climate fluctuations, such as increased water shortage. Moreover, previous studies about how water deficit impacts grape composition, lack accuracy due to imprecise timing of fruit sampling. In this study, we phenotyped six new fungus-tolerant genotypes exposed to varying water status in field-grown conditions. The accumulation of water, main cations, primary and secondary metabolites were precisely monitored at the arrest of phloem unloading in fruits, which was targeted at the whole cluster level. The goal was to decipher the effects of both genotype and water deficit on the allocation of carbon into soluble sugars, organic acids, amino acids and anthocyanins. The results revealed that the effect of decreased water availability was specific to each berry component. While fruit sugar concentration remained relatively unaffected, the malic/tartaric acid balance varied based on differences among genotypes. Despite showing contrasted strategies on carbon allocation into berry metabolites, all genotypes reduced fruit yield and the amount of compounds of interest per plant under water deficit, with the extent of reduction being genotype-dependent and correlated with the response of berry volume to plant water status. This first set of data provides information to help reasoning the adaptation of these varieties according to the expected risks of drought and the possibilities of mitigating them through irrigation.
摘要：
采用抗病葡萄是实施更明智的管理策略的有效选择，以限制与农药使用相关的环境影响。然而,关于预期的未来气候波动，他们对水果代谢物的生产知之甚少，比如增加缺水。此外，先前关于水分亏缺如何影响葡萄成分的研究，由于水果取样的时间不精确，缺乏准确性。在这项研究中,我们对在田间生长条件下暴露于不同水分状态的六种新的耐真菌基因型进行了表型分析。水的积累，主要阳离子，在果实韧皮部卸载停止时，对初级和次级代谢物进行了精确监测，它的目标是整个集群级别。目标是破译基因型和水分亏缺对碳分配到可溶性糖的影响，有机酸,氨基酸和花青素.结果表明，水分利用率降低的影响是每种浆果成分特有的。虽然水果糖浓度相对不受影响，苹果酸/酒石酸平衡根据基因型之间的差异而变化。尽管显示了将碳分配到浆果代谢物中的对比策略，在水分亏缺下，所有基因型都降低了果实产量和每株植物感兴趣的化合物的数量，减少的程度取决于基因型，并且与浆果体积对植物水分状态的反应相关。第一组数据提供了信息，以帮助根据预期的干旱风险以及通过灌溉减轻干旱的可能性来推理这些品种的适应性。
