Abstract
Abstract To investigate the interactive effects of drought, heat and elevated atmospheric CO 2 concentration ([ CO 2 ]) on plant water relations and grain yield in wheat, two wheat cultivars with different drought tolerance (Gladius and Paragon) were grown under ambient and elevated [ CO 2 ], and were exposed to post‐anthesis drought and heat stress. The stomatal conductance, plant water relation parameters, abscisic acid concentration in leaf and spike, and grain yield components were examined. Both stress treatments and elevated [ CO 2 ] reduced the stomatal conductance, which resulted in lower leaf relative water content and leaf water potential. Drought induced a significant increase in leaf and spike abscisic acid concentrations, while elevated [ CO 2 ] showed no effect. At maturity, post‐anthesis drought and heat stress significantly decreased the grain yield by 21.3%–65.2%, while elevated [ CO 2 ] increased the grain yield by 20.8% in wheat, which was due to the changes of grain number per spike and thousand grain weight. This study suggested that the responses of plant water status and grain yield to extreme climatic events (heat and drought) can be influenced by the atmospheric CO 2 concentration.
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Claims 10
Claim · model-written summary
Post-anthesis drought reduced wheat stomatal conductance.
- Taxon
- wheat
Triticum aestivumt0 - Treatment
- droughte2
- Outcome
- stomatal conductancee0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Both stress treatments and elevated [ CO 2 ] reduced the stomatal conductance, which resulted in lower leaf relative water content and leaf water potential.”
e1“Both stress treatments and elevated [ CO 2 ] reduced the stomatal conductance, which resulted in lower leaf relative water content and leaf water potential.”
t0“wheat”
e2“were exposed to post‐anthesis drought and heat stress”
Claim · model-written summary
Heat reduced wheat stomatal conductance.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- heatt0
- Outcome
- stomatal conductancee0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Both stress treatments and elevated [ CO 2 ] reduced the stomatal conductance, which resulted in lower leaf relative water content and leaf water potential.”
e1“Both stress treatments and elevated [ CO 2 ] reduced the stomatal conductance, which resulted in lower leaf relative water content and leaf water potential.”
t0“heat stress on plant water relations and grain yield in wheat”
Claim · model-written summary
Elevated CO2 reduced wheat stomatal conductance.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- elevated [ CO 2 ]e0
- Outcome
- stomatal conductancee0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Both stress treatments and elevated [ CO 2 ] reduced the stomatal conductance, which resulted in lower leaf relative water content and leaf water potential.”
e1“Both stress treatments and elevated [ CO 2 ] reduced the stomatal conductance, which resulted in lower leaf relative water content and leaf water potential.”
t0“wheat”
Claim · model-written summary
The treatments lowered leaf relative water content.
- Taxon
- wheatTriticum aestivumt0
- Outcome
- leaf relative water contente0
- Direction
- lowere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Both stress treatments and elevated [ CO 2 ] reduced the stomatal conductance, which resulted in lower leaf relative water content and leaf water potential.”
e1“Both stress treatments and elevated [ CO 2 ] reduced the stomatal conductance, which resulted in lower leaf relative water content and leaf water potential.”
t0“wheat”
Claim · model-written summary
The treatments lowered leaf water potential.
- Taxon
- wheatTriticum aestivumt0
- Outcome
- leaf water potentiale0
- Direction
- lowere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Both stress treatments and elevated [ CO 2 ] reduced the stomatal conductance, which resulted in lower leaf relative water content and leaf water potential.”
e1“Both stress treatments and elevated [ CO 2 ] reduced the stomatal conductance, which resulted in lower leaf relative water content and leaf water potential.”
t0“wheat”
Claim · model-written summary
Drought significantly increased leaf abscisic acid concentration.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- Droughte0
- Outcome
- leaf and spike abscisic acid concentrationse0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Drought induced a significant increase in leaf and spike abscisic acid concentrations, while elevated [ CO 2 ] showed no effect.”
e1“Drought induced a significant increase in leaf and spike abscisic acid concentrations, while elevated [ CO 2 ] showed no effect.”
t0“wheat”
Claim · model-written summary
Elevated CO2 showed no effect on leaf and spike abscisic acid concentration.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- elevated [ CO 2 ]e0
- Outcome
- leaf and spike abscisic acid concentrationse0
- Direction
- no effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Drought induced a significant increase in leaf and spike abscisic acid concentrations, while elevated [ CO 2 ] showed no effect.”
e1“Drought induced a significant increase in leaf and spike abscisic acid concentrations, while elevated [ CO 2 ] showed no effect.”
t0“wheat”
Claim · model-written summary
Post-anthesis drought and heat significantly decreased wheat grain yield by 21.3%–65.2%.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- post‐anthesis drought and heat stresse0
- Outcome
- grain yielde0
- Direction
- decreasede0
- Value
- 21.3%–65.2%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“post‐anthesis drought and heat stress significantly decreased the grain yield by 21.3%–65.2%”
e1“post‐anthesis drought and heat stress significantly decreased the grain yield by 21.3%–65.2%”
t0“wheat”
Claim · model-written summary
Elevated CO2 increased wheat grain yield by 20.8%.
- Taxon
- wheatTriticum aestivume0
- Treatment
- elevated [ CO 2 ]e0
- Outcome
- grain yielde0
- Direction
- increasede0
- Value
- 20.8%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“elevated [ CO 2 ] increased the grain yield by 20.8% in wheat”
e1“elevated [ CO 2 ] increased the grain yield by 20.8% in wheat”
Claim · model-written summary
The authors attributed the yield response to changes in grain number per spike and thousand grain weight.
- Taxon
- wheatTriticum aestivumt0
- Outcome
- grain number per spike and thousand grain weighte0
- Qualifier
- changese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“which was due to the changes of grain number per spike and thousand grain weight.”
e1“which was due to the changes of grain number per spike and thousand grain weight.”
t0“wheat”
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