Abstract
A four-year trial (1999–2002) was carried out in commercial vineyards in order to test the effect of manual leaf removal in the cluster zone at veraison on grape yield, berry composition, and stilbene concentration at harvest. Two Vitis vinifera L. red wine cultivars (Barbera and Croatina) and one white wine cultivar (Malvasia di Candia aromatica) were considered. The vines were Guyot trained, with 10 shoots per meter of row, and leaf removal accounted for approximately 22% of removed canopy surface. Meteorological data were recorded, as well as grape production, fruit composition, and stilbenes (trans-resveratrol, trans-piceid, cis-piceid) at harvest. Grape yield was not affected by leaf removal in any of the tested cultivars. Grape sugars and acidity were affected by leaf removal differently depending on meteorological conditions and cultivar. Leaf removal increased trans-piceid grape concentration in Barbera and decreased trans-resveratrol and cis-piceid in Croatina and Malvasia di Candia aromatica under cool meteorological conditions. Leaf removal had no effect on stilbene grape concentrations under warmer and drier climatic conditions.
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Claims 6
Claim · model-written summary
Leaf removal at veraison did not affect grape yield in any of the tested cultivars.
- Taxon
- Vitis vinifera L.
Vitis viniferae1 - Treatment
- Leaf removale2
- Outcome
- Grape yielde2
- Direction
- not affectede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Two Vitis vinifera L. red wine cultivars (Barbera and Croatina) and one white wine cultivar (Malvasia di Candia aromatica) were considered”
e2“Grape yield was not affected by leaf removal in any of the tested cultivars”
Claim · model-written summary
Leaf removal affected grape sugars and acidity differently depending on meteorological conditions and cultivar.
- Taxon
- Vitis vinifera L.Vitis viniferae1
- Treatment
- leaf removale2
- Outcome
- Grape sugars and aciditye2
- Qualifier
- depending on meteorological conditions and cultivare2
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Two Vitis vinifera L. red wine cultivars (Barbera and Croatina) and one white wine cultivar (Malvasia di Candia aromatica) were considered”
e2“Grape sugars and acidity were affected by leaf removal differently depending on meteorological conditions and cultivar”
Claim · model-written summary
Leaf removal increased trans-piceid grape concentration in Barbera under cool meteorological conditions.
- Taxon
- Vitis vinifera L.Vitis viniferae1
- Material
- Barberae2
- Treatment
- Leaf removale2
- Outcome
- trans-piceid grape concentratione2
- Direction
- increasede2
- Qualifier
- under cool meteorological conditionse2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Two Vitis vinifera L. red wine cultivars (Barbera and Croatina) and one white wine cultivar (Malvasia di Candia aromatica) were considered”
e2“Leaf removal increased trans-piceid grape concentration in Barbera and decreased trans-resveratrol and cis-piceid in Croatina and Malvasia di Candia aromatica under cool meteorological conditions”
Claim · model-written summary
Leaf removal decreased trans-resveratrol and cis-piceid grape concentrations in Croatina under cool meteorological conditions.
- Taxon
- Vitis vinifera L.Vitis viniferae1
- Material
- Croatinae2
- Treatment
- Leaf removale2
- Outcome
- trans-resveratrol and cis-piceide2
- Direction
- decreasede2
- Qualifier
- under cool meteorological conditionse2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Two Vitis vinifera L. red wine cultivars (Barbera and Croatina) and one white wine cultivar (Malvasia di Candia aromatica) were considered”
e2“Leaf removal increased trans-piceid grape concentration in Barbera and decreased trans-resveratrol and cis-piceid in Croatina and Malvasia di Candia aromatica under cool meteorological conditions”
Claim · model-written summary
Leaf removal decreased trans-resveratrol and cis-piceid grape concentrations in Malvasia di Candia aromatica under cool meteorological conditions.
- Taxon
- Vitis vinifera L.Vitis viniferae1
- Material
- Malvasia di Candia aromaticae2
- Treatment
- Leaf removale2
- Outcome
- trans-resveratrol and cis-piceide2
- Direction
- decreasede2
- Qualifier
- under cool meteorological conditionse2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Two Vitis vinifera L. red wine cultivars (Barbera and Croatina) and one white wine cultivar (Malvasia di Candia aromatica) were considered”
e2“Leaf removal increased trans-piceid grape concentration in Barbera and decreased trans-resveratrol and cis-piceid in Croatina and Malvasia di Candia aromatica under cool meteorological conditions”
Claim · model-written summary
Leaf removal had no effect on stilbene grape concentrations under warmer and drier climatic conditions.
- Taxon
- Vitis vinifera L.Vitis viniferae1
- Treatment
- Leaf removale3
- Outcome
- stilbene grape concentrationse3
- Direction
- no effecte3
- Qualifier
- under warmer and drier climatic conditionse3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Two Vitis vinifera L. red wine cultivars (Barbera and Croatina) and one white wine cultivar (Malvasia di Candia aromatica) were considered”
e3“Leaf removal had no effect on stilbene grape concentrations under warmer and drier climatic conditions”
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See all 95 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.