Abstract
Long-term induced water stress in field-grown grapevine leads to a progressive decline of stomatal conductance, accompanied by a decrease in CO 2 assimilation (40%). The apparent quantum yield also decreases (59%), which may reflect a relative increase in alternative processes for electron consumption. There is also a shift to non-stomatal regulation, as judged from significant depletions (37%) in maximum photosynthesis rate at saturating CO 2 related to limited ribulose biphosphate (RuBP) regeneration, whereas small, non-significant effects are observed on carboxylation efficiency. A high correlation (87%) between photosynthesis and stomatal conductance is observed for all experimental data and declines in intercellular CO 2 concentration parallel reductions in stomatal conductance. The data show that field response of grapevines to increasing soil water deficit involves stomatal and non-stomatal effects but, due to gradually induced drought, regulation mechanisms able to adjust mesophyll capacity to the average CO 2 supply. The non-stomatal adjustment seems to be exerted mainly in metabolic pathways related with the RuBP regeneration. Contrasting characteristics were observed for both cultivars. Tempranillo exploited the non-stressful conditions successfully, whereas Manto Negro, responding to its reputation as more drought resistant, showed a higher intrinsic water use efficiency, particularly for low water availability. This advantage seems to be due to lower non-stomatal limitations.
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Claims 12
Claim · model-written summary
Long-term water stress led to a progressive decline of stomatal conductance in field-grown grapevines.
VitisNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“in field-grown grapevines”
e1“Long-term induced water stress in field-grown grapevine leads to a progressive decline of stomatal conductance”
Claim · model-written summary
Long-term water stress decreased CO2 assimilation by 40% in field-grown grapevines.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“in field-grown grapevines”
e1“Long-term induced water stress in field-grown grapevine leads to a progressive decline of stomatal conductance”
e2“accompanied by a decrease in CO 2 assimilation (40%)”
Claim · model-written summary
Long-term water stress decreased the apparent quantum yield by 59% in field-grown grapevines.
- Treatment
- Long-term induced water stresse1
- Outcome
- apparent quantum yielde3
- Direction
- decreasese3
- Value
- 59%e3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“in field-grown grapevines”
e1“Long-term induced water stress in field-grown grapevine leads to a progressive decline of stomatal conductance”
e3“The apparent quantum yield also decreases (59%)”
Claim · model-written summary
Long-term water stress caused a significant 37% depletion in maximum photosynthesis rate at saturating CO2, related to limited RuBP regeneration.
- Treatment
- Long-term induced water stresse1
- Outcome
- maximum photosynthesis rate at saturating CO 2e4
- Direction
- depletionse4
- Value
- 37%e4
- Qualifier
- related to limited ribulose biphosphate (RuBP) regeneratione4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“in field-grown grapevines”
e1“Long-term induced water stress in field-grown grapevine leads to a progressive decline of stomatal conductance”
e4“significant depletions (37%) in maximum photosynthesis rate at saturating CO 2 related to limited ribulose biphosphate (RuBP) regeneration”
Claim · model-written summary
Carboxylation efficiency showed small, non-significant effects under water stress in field-grown grapevines.
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“in field-grown grapevines”
e1“Long-term induced water stress in field-grown grapevine leads to a progressive decline of stomatal conductance”
e5“small, non-significant effects are observed on carboxylation efficiency”
Claim · model-written summary
Photosynthesis and stomatal conductance were highly correlated (87%) across all experimental data.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“in field-grown grapevines”
e6“A high correlation (87%) between photosynthesis and stomatal conductance is observed for all experimental data”
Claim · model-written summary
Intercellular CO2 concentration declined in parallel with reductions in stomatal conductance in grapevines.
- Treatment
- reductions in stomatal conductancee7
- Outcome
- intercellular CO 2 concentratione7
- Direction
- declinese7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“in field-grown grapevines”
e7“declines in intercellular CO 2 concentration parallel reductions in stomatal conductance”
Claim · model-written summary
The field response of grapevines to increasing soil water deficit involves stomatal and non-stomatal effects.
- Outcome
- field response of grapevines to increasing soil water deficite1
- Qualifier
- stomatal and non-stomatal effectse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“in field-grown grapevines”
e1“field response of grapevines to increasing soil water deficit involves stomatal and non-stomatal effects”
Claim · model-written summary
The non-stomatal adjustment seems to act mainly through metabolic pathways related to RuBP regeneration.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“in field-grown grapevines”
e1“The non-stomatal adjustment seems to be exerted mainly in metabolic pathways related with the RuBP regeneration”
Claim · model-written summary
The cultivar Tempranillo exploited the non-stressful conditions successfully.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“in field-grown grapevines”
e1“Tempranillo exploited the non-stressful conditions successfully”
Claim · model-written summary
The cultivar Manto Negro showed a higher intrinsic water use efficiency, particularly under low water availability.
- Material
- Manto Negroe1
- Treatment
- low water availabilitye1
- Outcome
- intrinsic water use efficiencye1
- Direction
- highere1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“in field-grown grapevines”
e1“Manto Negro, responding to its reputation as more drought resistant, showed a higher intrinsic water use efficiency, particularly for low water availability”
Claim · model-written summary
The advantage of Manto Negro seems to be due to lower non-stomatal limitations.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“in field-grown grapevines”
e1“This advantage seems to be due to lower non-stomatal limitations”
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See all 18 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.