| Autor: |
Quartacci MF; Department of Agriculture, Food and Environment, University of Pisa, 56124 Pisa, Italy., Sgherri C; Department of Agriculture, Food and Environment, University of Pisa, 56124 Pisa, Italy., Pinzino C; Institute of Chemistry of Organometallic Compounds (ICCOM-CNR), Italian National Research Council, 56124 Pisa, Italy. |
| Jazyk: |
angličtina |
| Zdroj: |
Plants (Basel, Switzerland) [Plants (Basel)] 2022 May 13; Vol. 11 (10). Date of Electronic Publication: 2022 May 13. |
| DOI: |
10.3390/plants11101303 |
| Abstrakt: |
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. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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