UE INRAe de Pech Rouge, University of Montpellier, INRAe, 11430 Gruissan, France; University of Buenos Aires, Facultad de Agronomía, Cátedra de Fruticultura, Av. San Martín 4453, C1417DSE, CABA, Argentina.
UE INRAe de Pech Rouge, University of Montpellier, INRAe, 11430 Gruissan, France.
Food Chem. 2021 May 30;345:128825. doi: 10.1016/j.foodchem.2020.128825. Epub 2020 Dec 7.
The quality of wine grapes depends on the balance between primary and secondary metabolites. Unlike many perennial crops that accumulate starch in the fruits before ripening, the non-climacteric grapes ripe with no previous carbon reserves. Based on the assumption that fruit carbon sink is limiting metabolite accumulation in grapes, bunch thinning is performed to limit plant Sink/Source (S/S). We studied the effects of severe bunch thinning on the accumulation of primary metabolites and on four families of glycosylated aroma precursors (GAPs) at the arrest of fruit phloem unloading of two white grape Vitis vinifera cvs. At plant level, crop reduction resulted in significant losses of metabolites to be accumulated in the fruits: i.e. up to 72% for sugars, 75% for organic acids and GAPs. Nevertheless, S/S manipulation could not modify the balance between GAPs and primary metabolites or increase the concentration in GAPs in the physiologically ripe grape.
酿酒葡萄的品质取决于其主要和次要代谢物之间的平衡。与许多在成熟前将淀粉积累在果实中的多年生作物不同，非跃变型葡萄在没有先前碳储备的情况下成熟。基于这样的假设，即果实碳汇限制了葡萄中代谢物的积累，因此进行了果穗疏除以限制植物的源/库比（S/S）。我们研究了严重的果穗疏除对两种白葡萄品种 Vitis vinifera 果实韧皮部卸载停止时主要代谢物和 4 类糖基化香气前体（GAPs）积累的影响。在植株水平上，作物减少导致代谢物在果实中积累的显著损失：例如，糖的积累减少了 72%，有机酸和 GAPs 的积累减少了 75%。然而，S/S 操作并不能改变 GAPs 和主要代谢物之间的平衡，也不能增加生理成熟葡萄中 GAPs 的浓度。
