INFLUENCE OF DIFFERENT VINE ROOTSTOCKS ON THE VOLATILE COMPOSITION OF RED WINES FROM KAYLASHKI RUBIN GRAPEVINE VARIETY
DIMITAR R. DIMITROV *, ANATOLI M. ILIEV Institute of Viticulture and Enology, Department of Selection, Enology and Chemistry, 1 Kala Tepe str. 5800, Pleven, Bulgaria
*Corresponding author: dimitar_robertov@abv.bg
In order to determine the effect of some rootstocks on the volatile composition of red wines from three harvests (2017, 2018 and 2019) of the grafted interspecific hybrid variety Kaylashki Rubin a gas chromatographic (GC-FID) study was performed. The highest total content of volatile compounds was found in wines from vintage 2017. Acetaldehyde (basic aldehyde) levels were detected in the variants of all three vintages, in concentrations indicating a properly conducted fermentation process and followed sulphitation procedures. In the 2018 and 2019 harvests, it was found that wines obtained from Kaylashki Rubin variety grafted on rootstocks 110 R (2018) and 44-53 M (2019) shown a higher final content of higher alcohols compared to the control. The main representatives of the fraction of higher alcohols identified in wines were 2-methyl-1-butanol, 3-methyl-1-butanol, 1-butanol, 1-hexanol, 4-methyl-2-pentanol, 1-propanol and 2-butanol. The best results for total ester content were found in the wines from the 2019 harvest. In them, the wines of the Kaylashki Rubin variety grafted on the 44-53 M and 110 R rootstocks shown a higher ester content than the control. The basic ester was ethyl acetate. The main representative of the terpene fraction was geraniol. The wines from the 2017 and 2019 harvests at the Fercal rootstock shown a tendency of a higher total terpene concentration compared to the control. In all tested variants, the typical for red wines methyl alcohol concentrations was detected.
