Abstract
Worldwide, extensive agricultural losses are attributed to drought, often in combination with heat in Mediterranean climate regions, where grapevine traditionally grows. The available scenarios for climate change suggest increases in aridity in these regions. Under natural conditions plants are affected by a combination of stresses, triggering synergistic or antagonistic physiological, metabolic or transcriptomic responses unique to the combination. However the study of such stresses in a controlled environment can elucidate important mechanisms by allowing the separation of the effects of individual stresses. To gather those effects, cuttings of two grapevine varieties, Touriga Nacional (TN) and Trincadeira (TR), were grown under controlled conditions and subjected to three abiotic stresses (drought - WS, heat - HS and high light - LS) individually and in combination two-by-two (WSHS, WSLS, HSLS) or all three (WSHSLS). Photosynthesis, water status, contents of H2 O2 , abscisic acid and metabolites of the ascorbate-glutathione cycle were measured in the leaves. Common and distinct response features were identified in the different stress combinations. Photosynthesis was not hindered in TN by LS, while even individual stresses severely affect photosynthesis in TR. Abscisic acid may be implicated in grapevine osmotic responses since it is correlated with tolerance parameters, especially in combined stresses involving drought. Overall, the responses to drought-including treatments were clearly distinct to those without drought. From the specific behaviours of the varieties, it can be concluded that TN shows a higher capacity for heat dissipation and for withstanding high light intensities, indicating better adjustment to warm conditions, provided that water supply is plentiful.
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Claims 8
Claim · model-written summary
Common and distinct response features occurred across stress combinations.
VitisNot reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Common and distinct response features were identified in the different stress combinations.”
t0“grapevine”
Claim · model-written summary
High light did not hinder photosynthesis in Touriga Nacional.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Photosynthesis was not hindered in TN by LS”
e1“two grapevine varieties, Touriga Nacional (TN) and Trincadeira (TR)”
e2“three abiotic stresses (drought - WS, heat - HS and high light - LS)”
Claim · model-written summary
Even individual abiotic stresses severely affected Trincadeira photosynthesis.
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“even individual stresses severely affect photosynthesis in TR.”
e1“two grapevine varieties, Touriga Nacional (TN) and Trincadeira (TR)”
Claim · model-written summary
Abscisic acid correlated with grapevine tolerance parameters, especially under combined drought stresses.
- Compound
- Abscisic acide0
- Outcome
- tolerance parameterse0
- Qualifier
- especially in combined stresses involving droughte0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Abscisic acid may be implicated in grapevine osmotic responses since it is correlated with tolerance parameters, especially in combined stresses involving drought.”
Claim · model-written summary
Abscisic acid may participate in grapevine osmotic responses.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Abscisic acid may be implicated in grapevine osmotic responses since it is correlated with tolerance parameters, especially in combined stresses involving drought.”
Claim · model-written summary
Responses to drought-including treatments were distinct from responses without drought.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the responses to drought-including treatments were clearly distinct to those without drought.”
t0“grapevine”
Claim · model-written summary
Touriga Nacional had greater capacity for heat dissipation and withstanding high light than Trincadeira.
- Material
- Touriga Nacionale1
- Outcome
- capacity for heat dissipation and for withstanding high light intensitiese0
- Direction
- highere0
- Comparator
- Trincadeirae1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“TN shows a higher capacity for heat dissipation and for withstanding high light intensities, indicating better adjustment to warm conditions, provided that water supply is plentiful.”
e1“two grapevine varieties, Touriga Nacional (TN) and Trincadeira (TR)”
Claim · model-written summary
Touriga Nacional was interpreted as better adjusted to warm conditions when water supply is plentiful.
- Material
- Touriga Nacionale1
- Outcome
- adjustment to warm conditionse0
- Direction
- bettere0
- Qualifier
- provided that water supply is plentifule0
- Comparator
- Trincadeirae1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“TN shows a higher capacity for heat dissipation and for withstanding high light intensities, indicating better adjustment to warm conditions, provided that water supply is plentiful.”
e1“two grapevine varieties, Touriga Nacional (TN) and Trincadeira (TR)”
The same questions in other papers
light · physiology: photosynthesis · VitisPositive and negative results
5 papers in the same direction as this paper · 5 in the opposite direction
- positive
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See all 11 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.