The ‘Niagara Rosada’ (Vitis labrusca) grape is widely consumed for its nutritional qualities and flavor, in addition to presenting a great diversity of phytochemical compounds, mainly polyphenols. ‘Niagara Rosada’ has a limited shelf life, especially when kept at room temperature, a common form used by markets in Brazil. Salicylic acid (SA) is a low-cost alternative postharvest technique, due to its accessibility (low cost) and potential to mitigate postharvest losses, in addition to maintaining quality. Exogenous application of salicylic acid in the pre-harvest period was studied to improve the postharvest quality of ‘Niagara Rosada’ grapes with the aim of increasing its shelf life. SA was applied in different doses, in two stages during the pre-harvest, in the season of berry growth and during veraison. The results show that 1 and 2 mmol L⁻¹ were efficient in reducing the incidence of berry drop and decay of berries. Treatments with SA provided an increase in phenolic compounds. Among the phenolic acids, there was an increase in chlorogenic acid and gallic acid, related to antifungal action. Regarding polyphenols, rutin, cyanidin-3,5-diglucoside and 3-O-glycosidic delphinidin were the major compounds found in all treatments. Salicylic acid induced an increase in serotonin and melatonin content, as well as in the aminoacids (tryptophan and 5-hydroxytryptophan). During the storage, there was a decrease in histamine and dopamine levels. These alterations may be used as a tool to induce fruit resistance during storage, leading to an increase of crop yields. Thus, exogenous treatment using 1 and 2 mmol L⁻¹ SA increases postharvest life, improves biochemical quality of the musts and induces increased antioxidant compounds.

尼亚加拉罗莎达（Vitis labrusca））葡萄因其营养品质和风味而被广泛食用，此外还呈现出多种植物化学化合物（主要是多酚）的多样性。“ Niagara Rosada”的保质期有限，尤其是在室温下保存时，这是巴西市场常用的形式。水杨酸（SA）是一种低成本的替代收获后技术，因为它易于获取（成本低），并且除了保持质量外，还可以减轻收获后的损失。研究了在收获前水杨酸的外源施用以提高'Niagara Rosada'葡萄的收获后质量，旨在延长其保质期。在收获前，浆果生长季节和期间，在两个阶段分别以不同剂量施用SA。结果表明1和2 mmol L ^-1在降低浆果掉落和浆果腐烂的发生率方面非常有效。用SA处理可增加酚类化合物的含量。在酚酸中，绿原酸和没食子酸的增加与抗真菌作用有关。关于多酚，芦丁，花青素-3,5-二葡萄糖苷和3-O-糖苷飞燕草碱是所有治疗中发现的主要化合物。水杨酸引起5-羟色胺和褪黑激素含量以及氨基酸（色氨酸和5-羟基色氨酸）含量的增加。在储存期间，组胺和多巴胺水平降低。这些改变可以用作在储存过程中诱导果实抗性的工具，从而导致农作物产量的增加。因此，使用1和2 mmol L ^-1进行外源处理 SA延长了收获后的寿命，提高了芥末的生化质量并诱导了抗氧化剂的增加。