Abstract
This research aimed to identify the effects of increased temperature and decreased ultraviolet (UV) exposure on berry characteristics and quality parameters of cv Nebbiolo, identifying the potential risks associated with climate change for the quality of grapes and the identity of Barolo wine. This two-year research (2022 and 2023) was performed in three vineyards, located at different elevations in La Morra (Piedmont, northwestern Italy), monitored from the beginning of veraison to harvest. A split-plot design was set up, applying a passive greenhouse amplifying temperature in the bunch zone (‘T’ = increased temperature; ‘C’ = control temperature) and UV-blocking plastics over individual bunches (‘1’ = full UV exposure; ‘0’ = UV-blocked). Berry weight, skin weight, and juice total soluble solids were measured. Grape skin anthocyanins, flavonols, and hydroxycinnamic acid tartaric esters were analyzed by HPLC-DAD. Both treatments negatively influenced the berry weight but not the skin weight; the increased T had a negative impact on the sugar per berry content. Limited UV and increased temperature negatively impacted total anthocyanins at harvest and on di-hydroxylated anthocyanins. Limited UV-depressed flavonol concentration and high temperature decreased their synthesis. Increased UV promoted cis-p-coumaroyl tartaric acid and decreased trans-p-coumaroyl tartaric acid. The results of this research are valuable for improving the quality production of Nebbiolo through understanding the impacts of increased temperature and alterations to UV exposure expected by climate change.
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Claims 10
Claim · model-written summary
Increased temperature reduced berry weight.
Not reportedComparator
Verbatim
e0“Both treatments negatively influenced the berry weight but not the skin weight”
e1“effects of increased temperature and decreased ultraviolet (UV) exposure”
t0“Grapes (Vitis vinifera L.)”
Claim · model-written summary
Reduced UV reduced berry weight.
- Taxon
- Grapest0
- Treatment
- decreased ultraviolet (UV) exposuree1
- Outcome
- berry weighte0
- Direction
- negatively influencede0
Not reportedComparator
Verbatim
e0“Both treatments negatively influenced the berry weight but not the skin weight”
e1“decreased ultraviolet (UV) exposure”
t0“Grapes (Vitis vinifera L.)”
Claim · model-written summary
Neither treatment affected skin weight.
Not reportedComparator
Verbatim
e0“Both treatments negatively influenced the berry weight but not the skin weight”
t0“Grapes (Vitis vinifera L.)”
Claim · model-written summary
Increased temperature reduced sugar content per berry.
Not reportedComparator
Verbatim
e0“the increased T had a negative impact on the sugar per berry content”
t0“Grapes (Vitis vinifera L.)”
Claim · model-written summary
Reduced UV reduced total anthocyanins at harvest and di-hydroxylated anthocyanins.
- Taxon
- Grapest0
- Treatment
- Limited UVe0
- Outcome
- total anthocyanins at harvest and on di-hydroxylated anthocyaninse0
- Direction
- negatively impactede0
Not reportedComparator
Verbatim
e0“Limited UV and increased temperature negatively impacted total anthocyanins at harvest and on di-hydroxylated anthocyanins”
t0“Grapes (Vitis vinifera L.)”
Claim · model-written summary
Increased temperature reduced total anthocyanins at harvest and di-hydroxylated anthocyanins.
- Taxon
- Grapest0
- Treatment
- increased temperaturee0
- Outcome
- total anthocyanins at harvest and on di-hydroxylated anthocyaninse0
- Direction
- negatively impactede0
Not reportedComparator
Verbatim
e0“Limited UV and increased temperature negatively impacted total anthocyanins at harvest and on di-hydroxylated anthocyanins”
t0“Grapes (Vitis vinifera L.)”
Claim · model-written summary
Limited UV depressed flavonol concentration.
Not reportedComparator
Verbatim
e0“Limited UV-depressed flavonol concentration”
t0“Grapes (Vitis vinifera L.)”
Claim · model-written summary
High temperature decreased flavonol synthesis.
Not reportedComparator
Verbatim
e0“high temperature decreased their synthesis”
e1“flavonol concentration”
t0“Grapes (Vitis vinifera L.)”
Claim · model-written summary
Increased UV promoted cis-p-coumaroyl tartaric acid.
Not reportedComparator
Verbatim
e0“Increased UV promoted cis-p-coumaroyl tartaric acid”
t0“Grapes (Vitis vinifera L.)”
Claim · model-written summary
Increased UV decreased trans-p-coumaroyl tartaric acid.
Not reportedComparator
Verbatim
e0“Increased UV promoted cis-p-coumaroyl tartaric acid and decreased trans-p-coumaroyl tartaric acid”
t0“Grapes (Vitis vinifera L.)”
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