Effects of early leaf removal on grape yield, chemical characteristics, and antioxidant activity of grape variety Cabernet Sauvignon and wine from eastern Croatia (original) (raw)
Related papers
To cite this article: Mato Drenjančević, Vladimir Jukić, Krunoslav Zmaić, Toni Kujundžić & Vesna Rastija (2017): Effects of early leaf removal on grape yield, chemical characteristics, and antioxidant activity of grape variety Cabernet Sauvignon and wine from eastern Croatia, Acta Agriculturae Scandinavica, Section B — Soil & Plant Science,
Influence of selective removal of grapevine leaves on quality of red wine
2015
The selective removal (defoliation) of grapevine leaves around berry clusters can improve the quality of ripening grape by influencing the phenolic content at harvest. In this work we investigated the influence of partial defoliation on the phenolic composition and antioxidant activity of Vitis vinifera L. Cabernet Sauvignon grape, grown in Serbia and its wine. The results show significant difference between treated (early and late defoliation) grape samples and untreated control samples. The skin extracts of Cabernet Sauvignon grape obtained from the early defoliation plants showed to 88.75 % increase of total phenol content and to 12.70 % increase of antioxidant activity in 2012 grown season, as compared to the extracts from the control grape samples. This is reflected in the values of total phenols and the antioxidant capacity of appropriate wine samples. Partial early defoliation may be an excellent tool for yield control and quality grape and be employed as a management practic...
Scientia Horticulturae, 2017
Leaves are the vital components of grapevines. Leaves are removed with summer pruning to improve grape and wine quality. Leaves of some grape cultivars are harvested at different periods for stuffed grape leaves or brined vine leaves. Since the leaves of Narince grape cultivar supplies an income as much as the grapes, the cultivars are commonly exposed to excessive leaf harvests. The present study was conducted in 2014-2015 to investigate the effects of 4 different leaf harvest treatments (LHT) (control, 2, 4 and 6 harvests) on must and wine quality of Narince grape cultivar grown in Tokat province of Turkey. The grapes harvested at technological ripening level were processed into wine with microvinification method. The pH, total soluble solid contents (TSSC), titratable acidity, specific gravity, ethyl alcohol, volatile acid, reducing sugar, total sulphur dioxide, total phenolics, total flavonoids and some phenolic compounds of the must and wines were determined. LHTs increased TSSC and total phenolics of the must; pH, ethyl alcohol, total phenolics and total flavonoids of the wines increased in six LHT as compared to control treatment. While LHTs increased phenolic compounds of catechin, epicatechin and caffeic acid as compared to control treatment, coumaric acid was not observed in wines. Wine sensory scores were the highest in control treatment and the lowest in six leaf harvest treatments.
Notulae Botanicae Horti Agrobotanici Cluj-Napoca, 2016
Vitis vinifera L. cv. 'Agiorgitiko' is one of the most important red grape varieties of Greece, cultivated almost exclusively in the region of Nemea in north-eastern Peloponnese. This work aimed to study the influence of some commonly applied viticultural practices on the polyphenolic composition of 'Agiorgitiko'. Leaf removal at veraison, irrigation, and a combination of both, were applied and the phenolic content of the grapes and of the produced wines was compared. The results showed that leaf removal decreased berry size, enhanced total anthocyanin, total phenol and malvidin 3-O-monoglucoside accumulation in skins and increased the amount of extractable anthocyanins in the juice. The combination of irrigation and leaf removal caused a significant increase in total phenols in the skin and in the amount of extractable anthocyanins in juice. As far as the produced wines were concerned, color intensity, tannin content and total polyphenols were increased due to leaf removal. Both irrigation and leaf removal resulted in wines with the highest concentration of malvidin 3-O-monoglucoside, although neither practice resulted in any significant difference in anthocyanin concentration of the wines. Vines where only irrigation was applied produced berries with reduced extractable anthocyanins, increased seed total phenols and lower wine total tannins. The study showed that increasing cluster sun exposure of 'Agiorgitiko' vines may be, overall, beneficial to the quality of the produced wine.