## 3 Results and Discussion
### Influence of the Foliar MeI and ACP-MeI Treatments on Must Volatile Compounds
Moreover, as can be seen in Table 1, in the case of control berries and ACP-Mej treated berries, the probable alcohol content is higher in 2019 than in 2020, which may affect the content of volatile compounds in the grapes. Factorial (Treatment, Season and Their Interaction) and Discriminant Analysis of the Aroma Compounds in Vitis vinifera L. cv. Tempranillo Grapes from 2019 and 2020 Seasons  
Tables 3 and 4 show the factorial analysis of the general parameters (Table 3) and volatile compounds (Table 4) of the grapes with the two factors studied: treatment (control, MeJ, ACP-MeJ) and season (2019 and 2020). In Table 3, it can be seen that MeJ foliar treatments did not affect must enological parameters, except in the amount of total phenols, where the application of MeJ and ACP-MeJ increased its concentration with respect to those from the control grapes. However, some annual differences were observed. In fact, the weight of 100 berries, and the ammonium nitrogen were significantly lower in the grapes harvested in the 2019 than in 2020, while values of total acidity, fructose (Fru), malic acid, and total phenols were significantly lower in 2020 than in 2019. For any enological parameter, there was no significant interaction between the two factors (treatment and season) but for the ammonium nitrogen, amino nitrogen, and YAN. Regarding to the treatment factor, Table 4 shows that, for terpenids, MeJ foliar application increased the grape concentration of limonene, p-cymene, linalool, \(\alpha\)-terpineol, and total terpenids with respect to control and ACP-MeJ grapes. For the remaining terpenids, MeJ had no significant effect respect to control samples. On the other hand, ACP-MeJ applications showed no effect on the studied terpenids. For C\({}_{13}\) norisoprenoids, MeJ foliar application increased the concentration of \(\beta\)-ionone, and TDN with respect to the other two samples (control and ACP-MeJ). \(\beta\)-Cyclocitral content was similar in control and MeJ samples but higher than in ACP-MeJ one. The application of ACP-MeJ only increased the concentration of TDN with respect to the control grapes, being MeJ the most effective treatment (Table 4). MeJ treatment did not increase the concentration of benzenoid compounds. However, this treatment decreased the concentration of eugenol and benzyl alcohol with respect to the control samples. On the other hand, ACP-MeJ treatment increased the 2-phenylethanol concentration, and, since this is the most abundant benzenoid, ACP-MeJ foliar application also increased the concentration of total benzenoids respect to the control and MeJ treatments. On the other hand, foliar application of ACP-MeJ decreased the concentration of 2-phenylethanol, eugenol, and benzyl alcohol with respect to control and MeJ grapes (Table 4). For alcohols, MeJ treatment decreased the amount of n-octanol, 1-octen-3-ol, 2-ethyl-1-hexanol, and total alcohols, while the other compounds remained unaffected. In the case of the ACP-MeJ treatment, its application to vines decreased the grape concentration of all alcohols respect to the control one. For carbonyl compounds, MeJ foliar application did not increase the concentration of any of them respect to the control. However, MeJ application decreased the concentration of heptanal, (E)-2-octenal, nonanal, decanal, and total carbonyl compounds with respect to the control. ACP-MeJ foliar application decreased the concentration of heptanal, nonanal, (E)-2-nonenal, decanal, 6-methyl-3,5-heptadien-2-one, and total carbonyl compounds with respect to the control and increased the content of (E)-2-octenal respect to MeJ application (Table 4). Regarding C6 compounds, MeJ treatment increased the concentration of n-hexanol, n-hexanal, (E)-2-hexanal, and total C6 compounds with respect to the control and ACP-MeJ grapes. Foliar application of ACP-MeJ did not increase the concentration of C6 compounds, but decreased the amount of the n-hexanal, (Z)-3-hexen-1-ol + (E)-2-hexen-1-ol, (E)-2-hexenal, and total C6 compounds with respect to control grapes.