## 3 Results
### Nutraceuticaltical Compounds and Antioxidant Capacity
Grafting generally improved lycopene content (4.3- and 1.4-fold higher in the green and red fruit from  
Figure 4: Chlorophyll a and b (**A,B**), carotenoid (**C,D**) and lycopene amount (**E,F**) in the green (**A,C,E**) and red (**B,D,F**) fruit produced by the three pepper landraces “Cuerno” (C), “Valencia” (V), and “Sueca” (S) grafted (G) or ungrafted (U) onto rootstock F1 NIBER®. Values were the mean \(\pm\) SE of three fruit per replicate (3 replicates) per landrace. Means were subjected to a two-way ANOVA with grafting and landrace as sources of variability. Different letters for factors grafting and landrace, or their interaction, indicate significant differences at \(p<0.05\) using the LSD test. No letter indicates the non-significance of the \(F\) ratio. the grafted vs. ungrafted plants, respectively), and the landraces that produced the fruit with the highest lycopene content in both fruits was grafted \"Cuerno\" (Figure 4E,F). For the red fruit, the grafting and landrace interaction was significant. The analysis underlined that grafted \"Cuerno\" produced the red fruit with the highest lycopene content, followed by grafted \"Sueca\" (Figure 4F). both grafted and ungrafted \"Valencia\" were the landraces that produced red fruit with the lowest lycopene content. To understand the contribution of the different phytochemicals in both colored peppers, a correlation analysis was carried out between the different compounds and antioxidant capacity. In the green fruit from the ungrafted or grafted plants, a positive correlation appeared only between antioxidant capacity and phenols, even when the grafting technique was not considered (Table 2). The correlation found for the red fruit between phenols and antioxidant capacity was significant, but only for the grafted plants. For the red fruit, the correlation was significant when grafting was not considered. Chlorophyll and carotenoid content did not correlate with antioxidant capacity in the green and red fruit, whereas lycopene content correlated inversely with antioxidant capacity in the green fruit when grafting was not contemplated, and in the red fruit (Table 2). The correlations were also determined for each landrace, independently of the grafting technique, in both colored peppers (Table 3). In the \"Cuerno\" fruit, a significant correlation was found only in the red fruit between phenols and antioxidant capacity. Once again chlorophyll and carotenoid contents in the green and red fruit did not correlate with antioxidant capacity in any landraces, whereas lycopene was negatively related. \begin{table}
\begin{tabular}{c c c c c c c} \hline \hline \multirow{2}{*}{**Ptyochemicals**} & **GREEN** & **GREEN** & **GREEN** & **RED** & **RED** & **RED** \\  & **UG PLANTS** & **PLANTS** & **FRUTS** & **PLANTS** & **FRUTS** \\ \hline \multirow{2}{*}{Phenols} & ** ** & ** ** & ** & ** & * & * \\  & r = 0.85 & r = 0.77 & r = 0.83 & & r = 0.71 & r = 0.53 \\ \hline Total chlorophylls & ns & ns & ns & ns & ns & ns \\ \hline Carotenoids & ns & ns & ns & ns & ns & ns \\ \hline \multirow{2}{*}{Lycopene} & ns & ns & * & * & ** & *** \\  & ns & r = \(-\)0.57 & r = 0.68 & r = \(-\)0.78 & r = 0.81 \\ \hline \multirow{2}{*}{Ascorbic acid} & ns & ns & ns & ns & * & ** \\  & ns & ns & ns & ns & r = 0.65 & r = 0.56 \\ \hline \hline \end{tabular}
\end{table} 
Table 2: Correlation coefficients and their significance determined between each phytochemical and antioxidant capacity produced by the green and red fruit produced by the grafted (G) or ungrafted (UG) landraces on rootstock F1 NIBER®. Correlation coefficient r is reported when the correlation was significant. ns: \(p>0.05\); \({}^{*}\): \(p\leq 0.05\); \({}^{**}\): \(p\leq 0.01\); \({}^{***}\): \(p\leq 0.001\).