Effect of elicitors on the evolution of grape phenolic compounds during the ripening period

Abstract

The results indicate that the moment of elicitor treatment should be more studied since differences between treated and control grapes were, in general greater several days before harvest in all three varieties. © 2016 Society of Chemical Industry.

Improving phenolic and chromatic characteristics of Monastrell, Merlot and Syrah wines by using two elicitors

“…Statistically significant differences from the control values were detected for total tannins in skin and seeds from MeJtreated grapes and in wine from both treatments. Gómez-Plaza et al (2017) also found higher concentrations of tannins in Syrah grapes treated with MeJ at harvest. In our study, both treatments (BTH and MeJ) also had an effect on mDP in the skin, seeds and wines.…”

“…As has been seen, responses to the treatments depended on the variety. Other authors have mentioned a similar dependence on variety: for example, Vitalini et al (2011) in a study of the effect of BTH and chitosan on the melatonin content of grapes, and Gómez-Plaza et al (2017) in a study of the effects of elicitors applied during the ripening period in Syrah, Merlot and Monastrell grapes.…”

“…The field trial involved the application of two elicitors: BTH ([benzo-(1,2,3)-thiadiazole-7carbothioic acid S-methyl ester], Sigma Aldrich, St. Louis, USA) at a concentration of 0.3 mM; and MeJ (methyl jasmonate; Sigma Aldrich, St. Louis, USA) at a concentration of 10 mM. The protocol used to apply the different treatments was described previously (Gómez-Plaza et al, 2017). The concentrations were chosen according to the literature (Iriti et al, 2004;Vezzulli et al, 2007).…”

Evaluation of Grenache, Graciano and Tempranillo grape stilbene content after field applications of elicitors and nitrogen compounds

“…Overall, our results indicate that both elicitor compounds had a clear effect on stilbene compounds, although the effect depended on the grape variety since the application of YD had a positive impact on Grenache and Graciano, whereas MeJ exerted a greater influence on Graciano and Tempranillo. Nonetheless, since the application of YD has also been shown to increase grape stilbenes in Tempranillo in previous years, it could be hypothesized that other external factors such the vintage, or the time between application and harvest, could also influence the effectiveness of the treatments. With regard to the impact of both elicitors, different mechanisms of action can be assumed.…”

Biochemical and molecular effects of yeast extract applications on anthocyanin accumulation in cv. Sangiovese.

“…Elicitors are able to induce a physiological response in the plant, including activation of the secondary metabolism and synthesis of phenolic compounds through the release of reactive oxygen species (ROS), which stimulate the secondary metabolism pathways and activate antioxidant mechanisms [3]. Recent studies have shown that some elicitors can modify the composition of different grape varieties: in Tempranillo, the application of methyl jasmonate and yeast extracts led to an increase in the concentration of both anthocyanins and stilbenes [4,5]; similar effects were found in Merlot and Monastrell [6]. Further positive effects in the use of elicitors have also been observed in relation to the accumulation of aromas in grapes and wines of the Groppello Gentile cultivars [7], Monastrell [8] and Sangiovese [9].…”