Abstract
Leaf removal is known to enhance light exposure of clusters and therefore may affect grape composition. Owing to the risk of decreasing grape quality or sunburn as a consequence of improper sun exposure, it is crucial to determine the optimum leaf removal techniques adequate for the particular climate conditions of a vineyard area. Defoliation experiments on vine cv. Regent were conducted in two consecutive years (2014 and 2015). The effect of leaf removal treatment on the qualitative and quantitative composition of the polyphenol compounds in the grapes, with reference to the basic weather conditions of the vineyard area, located in Szczecin in the North-Western part of Poland, was assessed. Defoliation was performed manually in the cluster zone at three phenological plant stages: pre-flowering, berry-set and véraison. Leaf removal, especially early defoliation (pre-flowering), enhanced total polyphenol content, including the amount of anthocyanins, flavonols and flavan-3-ols and furthermore, it increased the amount of soluble solids, decreasing the titratable acidity in grapes. On the other hand, the treatments had a reducing impact on the phenolic acids in berries. Defoliation at earlier stages of cluster development appears to be an efficient strategy for improving berry quality in cool climate areas, however, additionally further weather data control is required to determine the effects on berry components.
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Claims 6
Claim · model-written summary
Leaf removal, especially early defoliation at pre-flowering, enhanced total polyphenol content in Regent grapes.
- Taxon
- Grapest0
- Material
- cv. Regentt0
- Treatment
- Leaf removal, especially early defoliation (pre-flowering)e1
- Outcome
- total polyphenol contente1
- Direction
- enhancede1
- Setting
- Szczecine3
Not reportedComparator
Verbatim
t0“Grapes cv. Regent Polyphenol Content”
e1“Leaf removal, especially early defoliation (pre-flowering), enhanced total polyphenol content”
e3“located in Szczecin”
Claim · model-written summary
Leaf removal enhanced the amounts of anthocyanins, flavonols and flavan-3-ols in Regent grapes.
- Taxon
- Grapest0
- Material
- cv. Regentt0
- Treatment
- Leaf removale1
- Outcome
- anthocyanins, flavonols and flavan-3-olse2
- Direction
- enhancede2
- Setting
- Szczecine3
Not reportedComparator
Verbatim
t0“Grapes cv. Regent Polyphenol Content”
e1“Leaf removal, especially early defoliation (pre-flowering), enhanced total polyphenol content”
e2“enhanced total polyphenol content, including the amount of anthocyanins, flavonols and flavan-3-ols”
e3“located in Szczecin”
Claim · model-written summary
Leaf removal increased the amount of soluble solids in grapes.
Not reportedComparator
Verbatim
t0“Grapes cv. Regent Polyphenol Content”
e1“Leaf removal, especially early defoliation (pre-flowering), enhanced total polyphenol content”
e4“it increased the amount of soluble solids”
Claim · model-written summary
Leaf removal decreased titratable acidity in grapes.
Not reportedComparator
Verbatim
t0“Grapes cv. Regent Polyphenol Content”
e1“Leaf removal, especially early defoliation (pre-flowering), enhanced total polyphenol content”
e5“decreasing the titratable acidity in grapes”
Claim · model-written summary
Leaf removal treatments had a reducing effect on phenolic acids in berries.
- Taxon
- Grapest0
- Organ / stage
- berriese6
- Treatment
- Leaf removale1
- Outcome
- phenolic acidse6
- Direction
- reducinge6
Not reportedComparator
Verbatim
t0“Grapes cv. Regent Polyphenol Content”
e1“Leaf removal, especially early defoliation (pre-flowering), enhanced total polyphenol content”
e6“the treatments had a reducing impact on the phenolic acids in berries”
Claim · model-written summary
Defoliation at earlier stages of cluster development is suggested as an efficient strategy for improving berry quality in cool climate areas.
Verbatim
t0“Grapes cv. Regent Polyphenol Content”
e7“Defoliation at earlier stages of cluster development appears to be an efficient strategy for improving berry quality in cool climate areas”
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