engleski

Metabolomic discrimination of genetic and geographical groups of grapevine varieties (Vitis vinifera L.)

Grapevine germplasm is highly variable and classified into geographical groups. Polyphenolic and volatile organic compounds (VOCs) have crucial role in winemaking industry due to their influence on wine quality. The aim of the research was to investigate the polyphenolic and volatile profiles of 50 grapevine varieties from different GEN-GEO groups: C2 (varieties from Italy and France), C7 (varieties from Croatia), C8 (varieties from Spain and Portugal). The most abundant class of polyphenols were anthocyanins, flavan-3-ols and flavonols, while carbonyls, alcohols and sesquiterpenes were the most abundant class of VOCs. Using discriminant analysis, the GEN-GEO groups were clearly separated by their polyphenolic and volatile profiles. Polyphenolic compounds contributing the most to the discrimination of groups belong to classes of hydroxycinnamic acids, flavan-3-ols, and flavonols. Furthermore, some of the compounds contributing to discrimination are found in relatively small amounts. Regarding the discrimination based on volatile profiles, GEO groups were discriminated by their overall volatile profile. C2 group contains higher amounts of carbonyl compounds and alcohols, while C8 group contains higher amounts of sesquiterpenes and acids. Group C7 is characterized by low content of VOCs. This data demonstrates that geographical origin, combined with genotype, influences the overall polyphenolic and volatile profiles.

Secondary metabolites, grapevine varieties, GEN-GEO groups, discriminant analysis

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