Abstract
Chenin blanc' is a key grape (Vitis vinifera L. subsp.vinifera) variety in the South African wine industry, and its quality is influenced by some viticultural practices, including leaf removal and harvest time.This study aimed to evaluate the effects of leaf removal and harvest date on physicochemical parameters and amino acid content of 'Chenin blanc' grapes.The trial was conducted in a commercial vineyard in Stellenbosch, South Africa, during the 2018-2019 season.The results showed that leaf removal and harvest date did not affect 'Chenin blanc' berry weight.Leaf removal significantly increased the concentration of several amino acids, including isoleucine, leucine, alanine, phenylalanine, and tryptophan.Grapes harvested at the stage of berries harvest-ripe according to Eichhorn and Lorenz scale (E-L 38) + 18 d had higher soluble solids (23.63 Brix) compared to those harvested at E-L 38 (21.15 Brix), and leaf removal resulted in increased soluble solids (23.28 to 21.50 Brix) compared to control.Succinic acid content was reduced in the leaf removal treatment, and total acidity was lower in grapes with leaf removal (4.85 to 7.56 g L -1 ).The interaction between leaf removal and harvest time significantly affected the amino acid content.Grapes harvested at E-L 38 + 18 d from vines subjected to leaf removal showed high contents of several amino ac ids, especially phenylalanine and tryptophan (14.47 to 10.46 and 4.50 to 3.11 mg L -1 , respectively).These findings suggest that both leaf removal and the timing of harvest contribute to the N composition of the grapes.The optimal harvest timing at around 25 Brix aligns with the concept of nitrogenous maturity, and further supporting information is needed to precise vineyard management to enhance wine quality.
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Claims 11
Claim · model-written summary
Leaf removal and harvest date did not affect berry weight.
- Taxon
- Grapet0
- Treatment
- leaf removal and harvest datee0
- Outcome
- 'Chenin blanc' berry weighte0
- Direction
- did not affecte0
Not reportedComparator
Verbatim
e0“leaf removal and harvest date did not affect 'Chenin blanc' berry weight”
t0“Grape”
Claim · model-written summary
Leaf removal significantly raised isoleucine, leucine and alanine concentrations.
Not reportedComparator
Verbatim
e0“Leaf removal significantly increased the concentration of several amino acids, including isoleucine, leucine, alanine, phenylalanine, and tryptophan”
t0“Grape”
Claim · model-written summary
Leaf removal significantly raised phenylalanine and tryptophan concentrations.
Not reportedComparator
Verbatim
e0“Leaf removal significantly increased the concentration of several amino acids, including isoleucine, leucine, alanine, phenylalanine, and tryptophan”
t0“Grape”
Claim · model-written summary
Harvesting 18 days after E-L 38 gave higher soluble solids than harvesting at E-L 38.
Verbatim
e0“Grapes harvested at the stage of berries harvest-ripe according to Eichhorn and Lorenz scale (E-L 38) + 18 d had higher soluble solids (23.63 Brix) compared to those harvested at E-L 38 (21.15 Brix)”
Claim · model-written summary
Leaf removal increased soluble solids over the control.
Verbatim
e0“leaf removal resulted in increased soluble solids (23.28 to 21.50 Brix) compared to control”
t0“Grape”
Claim · model-written summary
Leaf removal reduced succinic acid content.
Not reportedComparator
Verbatim
e0“Succinic acid content was reduced in the leaf removal treatment”
t0“Grape”
Claim · model-written summary
Leaf removal lowered total acidity.
- Taxon
- grapese0
- Treatment
- leaf removale0
- Outcome
- total aciditye0
- Direction
- lowere0
- Value
- 4.85 to 7.56 g L -1e0
Not reportedComparator
Verbatim
e0“total acidity was lower in grapes with leaf removal (4.85 to 7.56 g L -1 )”
Claim · model-written summary
Leaf removal and harvest time interacted significantly in their effect on amino acid content.
Not reportedDirection
Verbatim
e0“The interaction between leaf removal and harvest time significantly affected the amino acid content”
t0“Grape”
Claim · model-written summary
Late harvest after leaf removal gave high phenylalanine content.
- Taxon
- Grapese0
- Treatment
- leaf removale0
- Outcome
- phenylalaninee0
- Direction
- highe0
- Value
- 14.47 to 10.46e0
- Qualifier
- E-L 38 + 18 de0
Not reportedComparator
Verbatim
e0“Grapes harvested at E-L 38 + 18 d from vines subjected to leaf removal showed high contents of several amino ac ids, especially phenylalanine and tryptophan (14.47 to 10.46 and 4.50 to 3.11 mg L -1 , respectively)”
Claim · model-written summary
Late harvest after leaf removal gave high tryptophan content.
- Taxon
- Grapese0
- Treatment
- leaf removale0
- Outcome
- tryptophane0
- Direction
- highe0
- Value
- 4.50 to 3.11 mg L -1e0
- Qualifier
- E-L 38 + 18 de0
Not reportedComparator
Verbatim
e0“Grapes harvested at E-L 38 + 18 d from vines subjected to leaf removal showed high contents of several amino ac ids, especially phenylalanine and tryptophan (14.47 to 10.46 and 4.50 to 3.11 mg L -1 , respectively)”
Claim · model-written summary
Harvest around 25 Brix was proposed as an optimal timing aligned with nitrogenous maturity.
Verbatim
e0“The optimal harvest timing at around 25 Brix aligns with the concept of nitrogenous maturity”
t0“Grape”
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