Elicitors: a strategy to improve phenolic composition in wines
There are numerous strategies that can help us to obtain grapes and wines with a high phenolic content. Among these tools are the use of elicitors, used firstly in recent years as agents of defense against pathogenic attack in substitution to conventional phytosanitary products and secondly as a tool to increase the synthesis of secondary metabolites in the vine (Gil-Muñoz et al., 2017). In this work, four different elicitors were applied to 'Monastrell' during veraison: methyl jasmonate (MeJ), benzothiadiazol (BTH), a mixture of both previously named (MeJ+BTH), and finally, a grape marc extract (tested as a possible new elicitor in order to use a byproduct generated during winemaking). However, one of the possible consequences of the application of these agents could be the thickening of the cell wall, which would contribute to a greater difficulty in the extraction of phenolic compounds during the maceration process. In addition, 'Monastrell' is characterized by having a thicker cell wall than other red cultivars. By the reasons mentioned previously, in this study, two types of elaboration were used, one of them following a traditional protocol and another one a cold pre-fermentation maceration in order to optimize the correct use of these products in this cultivar.
Gil-Muñoz, R., Moreno-Olivares, J.D., Paladines-Quezada, D.F., Cebrían-Pérez, A. and Fernández-Fernández, J.I. (2020). Elicitors: a strategy to improve phenolic composition in wines. Acta Hortic. 1274, 9-16
'Monastrell', BTH, MeJ grapes, wines, grape marc extract, cold maceration