Elicitors and Pre-Fermentative Cold Maceration: Effects on Polyphenol Concentration in Monastrell Grapes and Wines.
Vitis vinifera L cv Monastrell is the main red grape variety grown for vinification in the Denomination of Origin Jumilla (southeast Spain). Different strategies are still being tested to optimize available resources both in terms of the environment and to achieve wines with better organoleptic and functional characteristics. The objective of this work was to combine two strategies: the application of methyl jasmonate (MeJ), benzothiadiazole (BTH), and methyl jasmonate + benzothiadiazole (MeJ + BTH) elicitors to Monastrell leaves, and pre-fermentative cold maceration. During two seasons, the experiment was carried out to improve the extraction of the phenolic compounds, whose levels may have increased following the application of elicitors in the field, and to assess the effect of both strategies on the wine quality. Discriminant analysis revealed that independently of the meteorological conditions during both years, the pre-harvest response to the application of elicitors MeJ, BTH, and MeJ + BTH, induced increases in total anthocyanin concentration of the treated grapes, allowing the distinction of the treatments. This analysis also allowed the distinction between the types of maceration used, showing greater extraction of phenolic compounds by the application of low temperature, giving wines with a higher index of total phenols, a greater intensity of color, and a lower luminosity.
['Paladines-Quezada|Diego F|DF|0000-0002-5425-9486', 'Moreno-Olivares|Juan D|JD|', 'Fernández-Fernández|José I|JI|', 'Bleda-Sánchez|Juan A|JA|', 'Martínez-Moreno|Alejandro|A|', 'Gil-Muñoz|Rocío|R|']
D000085:Acetates D003080:Cold Temperature D003517:Cyclopentanes D005285:Fermentation D054883:Oxylipins D059808:Polyphenols D013830:Thiadiazoles D027843:Vitis D014920:Wine
methyl jasmonate benzothiadiazole phenolic compounds flavonols