Effects of Partial Defoliation on the Skin Polyphenolic Content of Syrah Grapes (Vitis Vinifera l.) Grown in Skopje Vineyard Area

Beleski, Klime and Ivanova, Violeta and Nedelkovski, Dusko and Božinović, Zvonimir and Dimovska, Violeta (2012) Effects of Partial Defoliation on the Skin Polyphenolic Content of Syrah Grapes (Vitis Vinifera l.) Grown in Skopje Vineyard Area. In: 14th Serbian Congress of Fruit and Grapevine Producers with International Participation, 9-12 Oct 2012, Vrnjacka Banja, Serbia.

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Abstract

Influence of partial defoliation on skin polyphenol content was studied for Syrah grapevine variety, grown in Skopje vineyard area. Partial defoliation (50%) only from east side of the row, from different developmental stages, beginning from 15 days after blooming (S1), than 30 days after blooming (S2), 15 days before veraison (S3) and 30 days after veraison (S4), was applied. Concentrations of total phenols, total anthocyanins and total flavan-3-ols in the skins, during berry ripening, were assessed by spectrophotometry. According to the results, defoliation applied 30 days after blooming (S2) allowed achieving highest content of total anthocyanins, total phenols and total flavan-3-ols in the berry skin, while defoliation made 15 days after blooming leaded to lower content of polyphenols compared to S2 and control vine. Variants S3 and S4 had the lowest content of total anthocyanins, total phenols and total flavan-3-ols, Thus, the best period for defoliation of the Syrah grapevine variety was 15 to 30 days after blooming, in order to increase polyphenolic skin content.

Item Type:	Conference or Workshop Item (Lecture)
Subjects:	Agricultural Sciences > Agricultural biotechnology
Divisions:	Faculty of Agriculture
Depositing User:	Violeta Ivanova Petropulos
Date Deposited:	13 Nov 2012 07:44
Last Modified:	18 Dec 2013 14:58
URI:	https://eprints.ugd.edu.mk/id/eprint/746

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