Chitosan and Laminarin as Alternatives to Copper for Plasmopara viticola Control: Effect on Grape Amino Acid

Copper fungicide use is limited by the European regulation; therefore, new strategies have been developed to prevent grapevine downy mildew (GDM). However, there is poor information about their effects on grape amino acid composition. This field trial aimed to evaluate the effect on grape amino acid...

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Bibliographic Details
Published in:Journal of agricultural and food chemistry 2017-08, Vol.65 (34), p.7379-7386
Main Authors: Garde-Cerdán, T, Mancini, V, Carrasco-Quiroz, M, Servili, A, Gutiérrez-Gamboa, G, Foglia, R, Pérez-Álvarez, E. P, Romanazzi, G
Format: Article
Language:English
Subjects:
Amino Acids - metabolism
Chitosan - pharmacology
Copper - pharmacology
Fungicides, Industrial - pharmacology
Glucans - pharmacology
Oomycetes - drug effects
Oomycetes - metabolism
Oomycetes - physiology
Plant Diseases - microbiology
Vitis - metabolism
Vitis - microbiology
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Summary:Copper fungicide use is limited by the European regulation; therefore, new strategies have been developed to prevent grapevine downy mildew (GDM). However, there is poor information about their effects on grape amino acid composition. This field trial aimed to evaluate the effect on grape amino acid composition of chitosan and of a mixture of laminarin and Saccharomyces extracts (LamE), applied in different strategies with copper hydroxide. The results showed that all the treatments applied to grapevines decreased the concentration of several amino acids. Moreover, treatments that have mostly decreased these compounds are those with copper hydroxide, especially when applied individually. LamE applied individually or alternately with copper hydroxide had the least negative effect on grape amino acid content. These results provide further information about the negative effects of copper on grape quality, which can be reduced when it is used in strategy with LamE or chitosan in GDM control.
ISSN:0021-8561
1520-5118
DOI:10.1021/acs.jafc.7b02352