Impact of Leaf Removal on Phenolics and Antioxidant Activity of Trebbiano Berries ( Vitis vinifera L.)

Leaf removal is a canopy management practice widely applied in viticulture to enhance the phenol composition and concentration of grapes, which then results in improved wine quality. Many studies were carried out on red berried varieties, but information on white ones is scanty. The aim of the study...

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Bibliographic Details
Published in:Plants (Basel) 2022-05, Vol.11 (10), p.1303
Main Authors: Quartacci, Mike Frank, Sgherri, Cristina, Pinzino, Calogero
Format: Article
Language:English
Subjects:
Acids
antioxidant activity
Antioxidants
ascorbate
Ascorbic acid
Berries
Defoliation
Electron paramagnetic resonance
Electron spin resonance
Enzymes
Flavonoids
Flavonols
Fruit set
Fruits
grape
Grapes
Leaves
Microclimate
Oxidative stress
Phenolic acids
Phenols
Vines
Vitaceae
Viticulture
Vitis vinifera
Wines
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Summary:Leaf removal is a canopy management practice widely applied in viticulture to enhance the phenol composition and concentration of grapes, which then results in improved wine quality. Many studies were carried out on red berried varieties, but information on white ones is scanty. The aim of the study was to assess the effect of basal leaf defoliation in post fruit set on the phenol composition, ascorbate level and antioxidant activity of Trebbiano grapes. Electron paramagnetic resonance was also employed to monitor the decay kinetics of 1,1-diphenyl-2-picrylhydrazyl which allowed the identification of antioxidants with different action rates. The results show that defoliation caused an increase in the phenolic acid (hydroxycinnamic and hydroxybenzoic acids) and flavonol concentrations of berries without changes in the composition. Both ascorbate and antioxidant activity were also enhanced in the berries from defoliated vines. Besides increasing the number of fast-rate antioxidants, leaf removal resulted in the formation of intermediate-rate ones. In the Trebbiano variety, leaf removal in the post fruit set may represent an effective strategy to enhance the phenolic composition and the antioxidant defense system of berries.
ISSN:2223-7747
2223-7747
DOI:10.3390/plants11101303