Ruiz-Rodríguez Ana, Carrera Ceferino A, Setyaningsih Widiastuti, Barbero Gerardo F, Ferreiro-González Marta, Palma Miguel, Barroso Carmelo G
Department of Analytical Chemistry, IVAGRO, Faculty of Sciences, University of Cadiz, Puerto Real 11510, Spain.
Department of Food and Agricultural Product Technology, Faculty of Agricultural Technology, Gadjah Mada University, Jalan Flora, Bulaksumur 55281, Yogyakarta, Indonesia.
Molecules. 2017 Jun 6;22(6):941. doi: 10.3390/molecules22060941.
Some cultural practices that are carried out during the grape ripening period are associated with vine stress, including leaf removal, grape bunch removal, and vegetable cover crops. Additionally, several nitrogen and sulfur supplements have also been used directly on leaves during the last stage of the ripening period. In the work described here, five different cultural practices and the reference were applied in three replicates in the same vineyard. The evolution of tryptophan levels was evaluated from just after grape veraison until the harvest date. In some cases, certain specific treatments were also evaluated after the regular harvest date. The cultural techniques that involved the application of nitrogen led to higher levels of tryptophan at the harvest day when compared to other cultural techniques. It was also found that the application of nitrogen without sulfur had a faster effect on the level of tryptophan. It was established that a period of around 20 days is needed for the grapes to show clear differences in tryptophan levels after the application of nitrogen.
在葡萄成熟期进行的一些栽培措施与葡萄树的胁迫有关，包括摘除叶片、摘除葡萄串和种植蔬菜覆盖作物。此外，在成熟期的最后阶段，还直接在叶片上施用了几种氮和硫补充剂。在本文所述的研究中，在同一个葡萄园对五种不同的栽培措施及对照进行了三次重复试验。从葡萄开始变色到收获期，对色氨酸水平的变化进行了评估。在某些情况下，还在正常收获期之后对某些特定处理进行了评估。与其他栽培技术相比，施用氮肥的栽培技术在收获时导致色氨酸水平更高。还发现，不施硫而施用氮肥对色氨酸水平的影响更快。确定施用氮肥后，葡萄需要大约20天的时间才能在色氨酸水平上显示出明显差异。
