Abstract
At a local scale, kaolin particle-film technology is considered a short-term adaptation strategy to mitigate the adverse effects of global warming on viticulture. This study aims to evaluate kaolin application effects on photochemistry and related defence responses of Touriga Franca (TF) and Touriga Nacional (TN) grapevines planted at two Portuguese winegrowing regions (Douro and Alentejo) over two summer seasons (2017 and 2018). For this purpose, chlorophyll a fluorescence transient analysis, leaf temperature, foliar metabolites, and the expression of genes related to heat stress (VvHSP70) and stress tolerance (VvWRKY18) were analysed. Kaolin application had an inhibitory effect on VvHSP70 expression, reinforcing its protective role against heat stress. However, VvWRKY18 gene expression and foliar metabolites accumulation revealed lower gene expression in TN-treated leaves and higher in TF at Alentejo, while lipid peroxidation levels decreased in both treated varieties and regions. The positive kaolin effect on the performance index parameter (PIABS) increased at ripening, mainly in TN, suggesting that stress responses can differ among varieties, depending on the initial acclimation to kaolin treatment. Moreover, changes on chlorophyll fluorescence transient analysis were more pronounced at the Douro site in 2017, indicating higher stress severity and impacts at this site, which boosted kaolin efficiency in alleviating summer stress. Under applied contexts, kaolin application can be considered a promising practice to minimise summer stress impacts in grapevines grown in Mediterranean-like climate regions.
Abstract from the paper’s OpenAlex record; open copy licensed cc-by. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 7
Claim · model-written summary
Kaolin inhibited VvHSP70 expression.
VitisNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Kaolin application had an inhibitory effect on VvHSP70 expression”
t0“Grapevine”
Claim · model-written summary
Kaolin lowered VvWRKY18 expression in Touriga Nacional leaves.
- Material
- TNe0
- Treatment
- TN-treated leavese0
- Gene
- VvWRKY18e0
- Outcome
- VvWRKY18 gene expressione0
- Direction
- lowere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“VvWRKY18 gene expression and foliar metabolites accumulation revealed lower gene expression in TN-treated leaves”
t0“Grapevine”
Claim · model-written summary
Kaolin raised VvWRKY18 expression in Touriga Franca at Alentejo.
- Material
- TFe0
- Treatment
- Kaolin Applicationt1
- Gene
- VvWRKY18e0
- Outcome
- VvWRKY18 gene expressione0
- Direction
- highere0
- Setting
- Alentejoe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“VvWRKY18 gene expression and foliar metabolites accumulation revealed lower gene expression in TN-treated leaves and higher in TF at Alentejo”
t0“Grapevine”
t1“Kaolin Application”
Claim · model-written summary
Kaolin reduced lipid peroxidation in both varieties and regions.
- Treatment
- Kaolin Applicationt1
- Outcome
- lipid peroxidation levelse0
- Direction
- decreasede0
- Qualifier
- both treated varieties and regionse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“lipid peroxidation levels decreased in both treated varieties and regions”
t0“Grapevine”
t1“Kaolin Application”
Claim · model-written summary
The positive kaolin effect on PIABS increased at ripening, mainly in TN.
- Material
- TNe0
- Organ / stage
- ripeninge0
- Treatment
- kaoline0
- Outcome
- performance index parameter (PIABS)e0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The positive kaolin effect on the performance index parameter (PIABS) increased at ripening, mainly in TN”
t0“Grapevine”
Claim · model-written summary
Chlorophyll fluorescence changes were more pronounced at Douro in 2017.
- Outcome
- changes on chlorophyll fluorescence transient analysise0
- Direction
- more pronouncede0
- Qualifier
- in 2017e0
- Setting
- Douro sitee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“changes on chlorophyll fluorescence transient analysis were more pronounced at the Douro site in 2017”
t0“Grapevine”
Claim · model-written summary
The authors consider kaolin a promising practice to minimize summer stress impacts in Mediterranean-like grapevine regions.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“kaolin application can be considered a promising practice to minimise summer stress impacts in grapevines grown in Mediterranean-like climate regions”
The same questions in other papers
kaolin · physiology: oxidative · VitisResults agree
2 papers in the same direction as this paper
- positive
- positive
kaolin · molecular: expression · VitisResults agree
3 papers in the same direction as this paper
- positive
- positive
- positive
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.