Abstract
Global warming boosted by climate change affects grape quality, with increasing total soluble solids (TSS) content and decreasing total acidity (TA). However, current wine preferences increasingly include moderate alcohol content, higher acidity and the preservation of primary aromas reminiscent of grapes. Therefore, we hypothesised that applying phytohormones or mineral nutrients to leaves or carrying out defoliation can improve grape must properties in the face of climate warming and in accordance with current oenological trends. The effects of these three viticultural strategies were assessed independently from one another during three growing seasons in a Vitis vinifera L. cv. Tempranillo vineyard in northern Spain. Specifically, three 1-naphtaleneacetic acid (NAA) treatments, two early defoliations (ED; moderate and severe) and two foliar fertilisations with magnesium (Mg) were applied. Treatment with NAA was the most encouraging strategy for decreasing must TSS while increasing TA: it had slight effects on TSS in general and also slight effects on TA when applied close to veraison. The effects of the Mg treatments and moderate ED had null to slightly adverse effects. Finally, severe ED was clearly counter-productive. This study contributes to understanding the effects of both auxin and early defoliation treatments on grape must TSS, acidity and even yeast assimilable nitrogen (YAN) at harvest time. The favourable effects of NAA application are shown to be consistent though slight. Therefore, according to these results, the application of auxins may be an adequate choice for balancing sugars with acidity in grape musts. However, the results also suggest that more research needs to be undertaken to better characterise the effects of auxin treatments on grape must properties at harvest. In particular, different types of auxins, rates, concentrations and number of applications should be tested in the quest for more marked effects.
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Claims 5
Claim · model-written summary
NAA treatment decreased must TSS in Tempranillo grapes
- Taxon
- grapet0
- Material
- cv. Tempranillot0
- Treatment
- NAAe1
- Outcome
- must TSSe1
- Direction
- decreasinge1
- Qualifier
- slight effectse3
- Setting
- northern Spaine2
Not reportedComparator
Verbatim
t0“grape musts from cv. Tempranillo”
e1“Treatment with NAA was the most encouraging strategy for decreasing must TSS while increasing TA”
e2“in a Vitis vinifera L. cv. Tempranillo vineyard in northern Spain”
e3“it had slight effects on TSS in general and also slight effects on TA when applied close to veraison”
Claim · model-written summary
NAA treatment increased must TA in Tempranillo grapes, most when applied close to veraison
- Taxon
- grapet0
- Material
- cv. Tempranillot0
- Treatment
- NAAe1
- Outcome
- TAe1
- Direction
- increasinge1
- Qualifier
- when applied close to veraisone3
- Setting
- northern Spaine2
Not reportedComparator
Verbatim
t0“grape musts from cv. Tempranillo”
e1“Treatment with NAA was the most encouraging strategy for decreasing must TSS while increasing TA”
e2“in a Vitis vinifera L. cv. Tempranillo vineyard in northern Spain”
e3“it had slight effects on TSS in general and also slight effects on TA when applied close to veraison”
Claim · model-written summary
Foliar magnesium treatments had null to slightly adverse effects on grape must
Not reportedComparator
Verbatim
t0“grape musts from cv. Tempranillo”
e1“The effects of the Mg treatments and moderate ED had null to slightly adverse effects”
Claim · model-written summary
Moderate early defoliation had null to slightly adverse effects on grape must
Not reportedComparator
Verbatim
t0“grape musts from cv. Tempranillo”
e1“The effects of the Mg treatments and moderate ED had null to slightly adverse effects”
Claim · model-written summary
Severe early defoliation was clearly counter-productive for grape must
Not reportedComparator
Verbatim
t0“grape musts from cv. Tempranillo”
e1“severe ED was clearly counter-productive”
The same questions in other papers
1-naphthaleneacetic acid · quality: sugar starch · VitisPositive and negative results
2 papers in the same direction as this paper · 2 in the opposite direction
- negative
- negative
- positive
1 paper more in this group
See all 5 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.