## 3 Results and Discussion
### Influence of the Foliar MeI and ACP-MeI Treatments on Must Volatile Compounds
These compounds are high volatile compounds, and have very low perception threshold, and therefore represent one of the most important group of aromatic compounds [12; 40], and among these, linalool, \(\alpha\)-terpineol, and geraniol, which are some of the most odoriferous monoterenes [5]. Figure 3: Benzenoid compounds concentration (\(\mu\)g/L) in grapes from control, methyl jasmonate (MeJ) and nanoparticles doped with MeJ (ACP-MeJ) foliar treatments, in 2019 and 2020 seasons. All parameters listed with their standard deviation (\(n=3\)). For each season and compound, different letters indicate significant differences between samples (\(p\leq 0.05\)). \begin{table}
\begin{tabular}{c c c c c c c} \hline \hline  & \multicolumn{3}{c}{**2019**} & \multicolumn{3}{c}{**2020**} \\ \hline  & **Control** & **MeJ** & **ACT-MeJ** & **Control** & **MeJ** & **ACF-MeJ** \\ \hline _Alcohols_ & & & & & & \\ n-Heptumal & 0.062 \(\pm\) 0.010 c & 0.046 \(\pm\) 0.008 b & 0.028 \(\pm\) 0.005 a & 0.047 \(\pm\) 0.002 a & 0.044 \(\pm\) 0.009 a & 0.045 \(\pm\) 0.009 a \\ n-OCanol & 0.191 \(\pm\) 0.014 b & 0.174 \(\pm\) 0.017 b & 0.107 \(\pm\) 0.013 a & 0.326 \(\pm\) 0.018 b & 0.234 \(\pm\) 0.042 a & 0.238 \(\pm\) 0.048 a \\ n-NAomol & 0.064 \(\pm\) 0.006 b & 0.059 \(\pm\) 0.010 b & 0.031 \(\pm\) 0.007 a & 0.197 \(\pm\) 0.036 b & 0.245 \(\pm\) 0.048 b & 0.093 \(\pm\) 0.015 a \\ l-Ocan-3 ol & 0.595 \(\pm\) 0.043 b & 0.296 \(\pm\) 0.063 a & 0.243 \(\pm\) 0.031 a & 0.174 \(\pm\) 0.036 b & 0.074 \(\pm\) 0.006 a & 0.147 \(\pm\) 0.030 b \\ 2-Ethyl-1-hexanol & 3.088 \(\pm\) 0.060 b & 1.798 \(\pm\) 0.309 a & 1.625 \(\pm\) 0.137 a & 1.870 \(\pm\) 0.131 b & 0.063 \(\pm\) 0.132 a & 2.140 \(\pm\) 0.446 b \\ _Total_ & 4.401 \(\pm\) 0.108 b & 2.373 \(\pm\) 0.387 a & 2.035 \(\pm\) 0.167 a & 2.613 \(\pm\) 0.048 b & 1.460 \(\pm\) 0.156 a & 2.663 \(\pm\) 0.052 b \\ _Carbonyl compounds_ & & & & & & \\ \hline Hepitalital & 0.055 \(\pm\) 0.009 b & 0.034 \(\pm\) 0.007 a & 0.033 \(\pm\) 0.004 a & 0.014 \(\pm\) 0.002 b & 0.007 \(\pm\) 0.001 a & 0.010 \(\pm\) 0.001 a \\ (E)-2-Octanol & 0.059 \(\pm\) 0.005 a & 0.051 \(\pm\) 0.009 a & 0.051 \(\pm\) 0.006 a & 0.043 \(\pm\) 0.009 b & 0.024 \(\pm\) 0.004 a & 0.024 \(\pm\) 0.007 b \\ Nonanal & 0.204 \(\pm\) 0.039 b & 0.115 \(\pm\) 0.028 a & 0.083 \(\pm\) 0.011 a & 0.381 \(\pm\Figure 2 shows the concentration of C\({}_{13}\) norisoprenoids found in the control and in the grapes from the applications to vines of Mej and ACP-Mej, in 2019 and 2020 seasons. In 2019, (E)-\(\beta\)-damascenone (Figure 2a), (Z)-\(\beta\)-damascenone (Figure 2b), and 1,1,6-trimetil-1,2-dihidronaftaleno (TDN) (Figure 2e), increased their concentration in Mej grapes and decreased their concentration in ACP-Mej samples with respect to control. The (E)-\(\beta\)-damascenone (Figure 2a) was the most abundant C\({}_{13}\) norisoprenoid in the samples, predominantly over the rest of the compounds of this group. This fact is expected because this compound is one of the most abundant norisoprenoid in the grapes [12; 41]. TDN is one of the most polarising, and maybe the less studied C\({}_{13}\) norisoprenoid [39], its typical aroma descriptor is pretolor kerosene. In the case of \(\beta\)-ionone (Figure 2c), which provides violet notes [42], and \(\beta\)-cyclocitral (Figure 2d), both significantly decreased their amount in ACP-Mej grapes relative to control and Mej samples. Regarding the total C\({}_{13}\) norisoprenoids (Figure 2f) in 2019, Mej treatment increased its content with respect to control grapes. This could be probably due to the fact that the Mej increases the activity of the enzymes involved in the synthesis of these compounds [43], which derive from biodegradation of carotenoids [40; 44], whereas ACP-Mej treatment decreased it. Therefore, despite applying the same product, the dose was 10 times lower, and maybe it was too low to affect enzyme activity.