Abstract
Aim: The study of elicitors in grapevines has focused on inducing resistance to diseases and improving phenolic and volatile composition of grapes and wines. Due to the importance of nitrogen compounds in grape quality, the aim of this work was to study the effect of methyl jasmonate (MeJ) applied to two grapevine varieties on grape amino acid content during two consecutive seasons.Methods and results: Amino acids were analyzed by HPLC-DAD. The results showed that MeJ applications to Tempranillo grapevines decreased the concentration of certain amino acids during both seasons, but did not affect total amino acid content. Moreover, MeJ applications to Graciano grapevines increased the concentration of several amino acids during the second season.Conclusions: The effects of MeJ on grape amino acid concentration were conditioned by variety and vintage.Significance and impact of the study: The importance of this work is to provide more information with respect to the effects of elicitors on grape quality for good viticultural management.
Highlights
Elicitors are a specific class of molecules originating from different organisms, which are able to trigger plant defense responses contributing to plant resistance against pathogen attacks
Gutiérrez-Gamboa et al (2017) reported that methyl jasmonate (MeJ) applied to grapevines increased Met and Phe content, while other elicitors such as chitosan and yeast extract decreased the concentration of several amino acids in grapes
Slight differences were found after MeJ application
Summary
Elicitors are a specific class of molecules originating from different organisms, which are able to trigger plant defense responses contributing to plant resistance against pathogen attacks. Elicitors are used as an alternative strategy to chemical fungicides, with the aim to induce defense mechanisms against different grapevine pathogens (Romanazzi et al, 2002 ; Romanazzi et al, 2013 ; Delaunois et al, 2014). To our knowledge, there are only two reports describing the effects of foliar elicitor treatments on grape amino acid content. Gutiérrez-Gamboa et al (2017) reported that MeJ applied to grapevines increased Met and Phe content, while other elicitors such as chitosan and yeast extract decreased the concentration of several amino acids in grapes. Despite the effects exposed in the aforementioned reports, it is important to study how different factors, such as variety and season, can affect grape amino acid concentration through the application of MeJ to the grapevines
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