Grape aromas are compounds that come from the secondary metabolism of the plants and are directly related to grape and wine quality. Several studies have shown that the foliar application to the vine of phenylalanine (Phe), methyl jasmonate (MeJ) and a mixture of both (Phe + MeJ) can increase the synthesis of some secondary metabolites. The effect of these treatments on the grape phenolic compounds and amino acids content has been studied, but not on the grape aromatic composition. Therefore, the aim of this work was to study the effect of the foliar application of Phe, MeJ and Phe + MeJ on the Grenache grape volatile compounds. The grape volatile composition (terpenes, C13 norisoprenoids, benzenoid compounds, esters, and C6 compounds) was determined by HS-SPME-GC-MS. The results showed that the MeJ and Phe + MeJ treatments increased the total content of terpenes in the grapes, being the MeJ the most effective treatment, with the content of these varietal compounds up to 98% higher than in the control grapes. On the other hand, all treatments increased the C13 norisoprenoids content in Grenache grapes, again being the MeJ the most effective treatment, increasing the content of these ones up to 67% respect to the control. For the benzenoid compounds, both the Phe and the Phe + MeJ treatments enhanced their content in grapes, being the Phe the most effective treatment, with an increase of up to 188% respect to the control grapes. All the treatments had a negative effect for the esters found in the grapes. The C6 compounds, which contribute to the herbaceous aromas of the wine, considered as negative notes, did not increase their content in the grapes with any treatment compared to the control. In conclusion, the phenylalanine and/or methyl jasmonate grapevines foliar application is an useful tool in order to improve the aromatic composition of Grenache variety

Resumen del trabajo presentado en el 11th International Symposium of Enology, Œno2019 - 11th Edition of In Vino Analytica Scientia IVAS 2019, celebrado en Burdeos (Francia), del 25 al 28 de junio de 2019