Abstract
This study was conducted in three grapevine cultivars (cv. Chardonnay, Merlot and Cabernet-Sauvignon) vines during the 2009 growing season in the ECOTRON of the campus of Montpellier SupAgro/France. The aim of this research was to analyze the effect of sudden and extreme water stress (EWS) to determine the limit of the leaf drying (depend on Ψleaf), possibilities of recovering, and its relationship with grapes composition. A randomized block design was used. There were three blocks with three replicates. In the experiment all plots consisted of totally 36 grapevines. During the entire experiment in ESW vines both Ψpdand Ψmd values were close to each other by decreasing to about -2.1 MPa in all three varieties. After this level (-2.1 MPa) they both get close to each other until their equality in -3.7 MPa. This value was determined as the threshold of all leaf dryings in the vines. In EWS vines the lowest read Ψpd and Ψmd was -4.6 MPa. In the next measurement Ψpd and Ψmdwere forced to -5.0 MPa, and water exit from leaf petiole was not observed in the same vines. After EWS treatment, berries became smaller and these lead to increase of Anthocyanin concentration, Folin-Ciocalteu index (FCI) and PTI values at harvest time. However as a result of EWS applications pH values increased to a level which had a negative effect on wine quality. There was a reduction in the values of 100 berry weight, berry volume, total soluble solids (TSS), sugar concentration, sugar content per berry, K and tartaric acid. The conclusion is that as a result of sudden EWS although all the leaves dried, vines did not die even they recovered by rewatering. However EWS had a negative effect on the berry quality. Key words: Leaf water potential, extreme water stress, berry composition, recovering, leaf drying limits.
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Claims 12
Claim · model-written summary
The leaf water potential value of -3.7 MPa, at which predawn and midday values became equal, was determined as the threshold of all leaf dryings in the vines.
Verbatim
t0“grapevine (Vitis vinifera L.)”
e0“until their equality in -3.7 MPa. This value was determined as the threshold of all leaf dryings in the vines”
Claim · model-written summary
In vines under extreme water stress, predawn and midday leaf water potentials were close to each other while decreasing to about -2.1 MPa in all three varieties.
Verbatim
t0“grapevine (Vitis vinifera L.)”
e0“in ESW vines both Ψpdand Ψmd values were close to each other by decreasing to about -2.1 MPa in all three varieties”
Claim · model-written summary
In vines under extreme water stress the lowest read predawn and midday leaf water potentials were -4.6 MPa.
Verbatim
t0“grapevine (Vitis vinifera L.)”
e0“In EWS vines the lowest read Ψpd and Ψmd was -4.6 MPa”
Claim · model-written summary
When leaf water potentials were forced to -5.0 MPa, water exit from the leaf petiole was not observed in the same vines.
Verbatim
t0“grapevine (Vitis vinifera L.)”
e0“In the next measurement Ψpd and Ψmdwere forced to -5.0 MPa, and water exit from leaf petiole was not observed in the same vines”
Claim · model-written summary
After extreme water stress treatment, berries became smaller and anthocyanin concentration, Folin-Ciocalteu index and PTI values increased at harvest time.
- Organ / stage
- berriese0
- Treatment
- EWS treatmente0
- Outcome
- Anthocyanin concentration, Folin-Ciocalteu index (FCI) and PTI valuese0
- Direction
- increasee0
- Qualifier
- berries became smallere0
VitisNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“grapevine (Vitis vinifera L.)”
e0“After EWS treatment, berries became smaller and these lead to increase of Anthocyanin concentration, Folin-Ciocalteu index (FCI) and PTI values at harvest time”
Claim · model-written summary
As a result of extreme water stress applications, pH values increased to a level that had a negative effect on wine quality.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“grapevine (Vitis vinifera L.)”
e0“as a result of EWS applications pH values increased to a level which had a negative effect on wine quality”
Claim · model-written summary
Extreme water stress reduced 100 berry weight and berry volume.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“grapevine (Vitis vinifera L.)”
e0“After EWS treatment”
e1“reduction in the values of 100 berry weight, berry volume”
Claim · model-written summary
Extreme water stress reduced total soluble solids, sugar concentration and sugar content per berry.
- Treatment
- EWS treatmente0
- Outcome
- total soluble solids (TSS), sugar concentration, sugar content per berrye1
- Direction
- reductione1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“grapevine (Vitis vinifera L.)”
e0“After EWS treatment”
e1“reduction in the values of 100 berry weight, berry volume, total soluble solids (TSS), sugar concentration, sugar content per berry”
Claim · model-written summary
Extreme water stress reduced potassium and tartaric acid.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“grapevine (Vitis vinifera L.)”
e0“After EWS treatment”
e1“reduction in the values of 100 berry weight, berry volume, total soluble solids (TSS), sugar concentration, sugar content per berry, K and tartaric acid”
Claim · model-written summary
After sudden extreme water stress all the leaves dried.
Not reportedComparatorDirection
Verbatim
t0“grapevine (Vitis vinifera L.)”
e0“as a result of sudden EWS although all the leaves dried, vines did not die even they recovered by rewatering”
Claim · model-written summary
Despite all leaves drying after sudden extreme water stress, the vines did not die and recovered after rewatering.
Not reportedComparatorDirection
Verbatim
t0“grapevine (Vitis vinifera L.)”
e0“as a result of sudden EWS although all the leaves dried, vines did not die even they recovered by rewatering”
Claim · model-written summary
Extreme water stress had a negative effect on berry quality.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“grapevine (Vitis vinifera L.)”
e0“However EWS had a negative effect on the berry quality”
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