Grupo VIENAP, Instituto de Ciencias de la Vid y del Vino (CSIC, Gobierno de La Rioja, Universidad de La Rioja), Carretera de Burgos, km. 6, Logroño, La Rioja, 26007, Spain.
J Sci Food Agric. 2023 Aug 15;103(10):4813-4825. doi: 10.1002/jsfa.12549. Epub 2023 Mar 29.
Grape aromas are formed by a great number of volatile compounds. Methyl jasmonate (MeJ) and urea (Ur) foliar applications have been studied to improve grape quality, but their combined application has never been studied.
In both seasons, MeJ application enhanced terpenoids and C6 compounds synthesis, though decreased alcohols content. Moreover, MeJ + Ur treatment reduced benzenoids and alcohols and did not affect C -norisoprenoids content. However, there was no clear effect of these treatments on the rest of the volatile compounds. Multifactorial analysis showed a season effect on all volatile compounds, except terpenoids. Discriminant analysis showed a good separation among samples under treatment criterion. The great effect of MeJ treatment on terpenoids was probably due to this elicitor influencing their biosynthesis.
Season has a strong influence on grapes aromatic composition since it affects all volatile compound families except terpenoids. MeJ foliar application enhanced terpenoids, C -norisoprenoids and C6 compounds synthesis, whereas decreased alcohols content; however, MeJ + Ur foliar treatment did not affect C -norisoprenoids and C6 compounds, and decreased benzenoids and alcohols grape compounds. Therefore, no synergistic effect was observed between Ur and MeJ on grape volatile compounds biosynthesis. Foliar application of MeJ seems to be sufficient to improve the aromatic quality of grapes. © 2023 The Authors. Journal of The Science of Food and Agriculture published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry.
葡萄的香气是由大量挥发性化合物形成的。甲基茉莉酮酸（MeJ）和尿素（Ur）的叶面喷施已被研究用于提高葡萄品质，但它们的联合应用从未被研究过。
在两个季节中，MeJ 的应用都增强了萜烯类和 C6 化合物的合成，尽管降低了醇的含量。此外，MeJ + Ur 处理减少了苯类和醇类，而不影响 C-异戊二烯类的含量。然而，这些处理对其余挥发性化合物没有明显的影响。多因素分析显示，季节对除萜烯类以外的所有挥发性化合物都有影响。判别分析显示，在处理标准下，样品之间有很好的分离。MeJ 处理对萜烯类的巨大影响可能是由于这种诱导剂影响了它们的生物合成。
季节对葡萄的香气成分有很强的影响，因为它影响了除萜烯类以外的所有挥发性化合物家族。MeJ 的叶面喷施增强了萜烯类、C-异戊二烯类和 C6 化合物的合成，而降低了醇的含量；然而，MeJ + Ur 的叶面处理对 C-异戊二烯类和 C6 化合物没有影响，而降低了苯类和醇类葡萄化合物。因此，Ur 和 MeJ 对葡萄挥发性化合物生物合成没有协同作用。MeJ 的叶面喷施似乎足以提高葡萄的香气质量。© 2023 作者。《食品科学杂志》由 John Wiley & Sons Ltd 代表化学工业协会出版。
