Abstract
Elevated CO 2 appears to be a significant factor in global warming, which will likely lead to drought conditions in many areas. Few studies have considered the interactive effects of higher CO 2 , temperature and drought on plant growth and physiology. We grew canola ( Brassica napus cv. 45H72) plants under lower (22/18°C) and higher (28/24°C) temperature regimes in controlled‐environment chambers at ambient (370 μmol mol −1 ) and elevated (740 μmol mol −1 ) CO 2 levels. One half of the plants were watered to field capacity and the other half at wilting point. In three separate experiments, we determined growth, various physiological parameters and content of abscisic acid (ABA), indole‐3‐acetic acid and ethylene. Drought‐stressed plants grown under higher temperature at ambient CO 2 had decreased stem height and diameter, leaf number and area, dry matter, leaf area ratio, shoot/root weight ratio, net CO 2 assimilation and chlorophyll fluorescence. However, these plants had increased specific leaf weight, leaf weight ratio and chlorophyll concentration. Elevated CO 2 generally had the opposite effect, and partially reversed the inhibitory effects of higher temperature and drought on leaf dry weight accumulation. This study showed that higher temperature and drought inhibit many processes but elevated CO 2 partially mitigate some adverse effects. As expected, drought stress increased ABA but higher temperature inhibited the ability of plants to produce ABA in response to drought.
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Claims 7
Claim · model-written summary
Drought with higher temperature at ambient CO2 decreased stem height, diameter, and leaf number.
- Taxon
- plantsViridiplantaee0
- Treatment
- Drought‐stressed plants grown under higher temperature at ambient CO 2e0
- Outcome
- stem height and diameter, leaf number and areae0
- Direction
- decreasede0
Not reportedComparator
Verbatim
e0“Drought‐stressed plants grown under higher temperature at ambient CO 2 had decreased stem height and diameter, leaf number and area, dry matter, leaf area ratio, shoot/root weight ratio, net CO 2 assimilation and chlorophyll fluorescence.”
Claim · model-written summary
Drought with higher temperature at ambient CO2 decreased dry matter and leaf area ratio.
- Taxon
- plantsViridiplantaee0
- Treatment
- Drought‐stressed plants grown under higher temperature at ambient CO 2e0
- Outcome
- dry matter, leaf area ratio, shoot/root weight ratioe0
- Direction
- decreasede0
Not reportedComparator
Verbatim
e0“Drought‐stressed plants grown under higher temperature at ambient CO 2 had decreased stem height and diameter, leaf number and area, dry matter, leaf area ratio, shoot/root weight ratio, net CO 2 assimilation and chlorophyll fluorescence.”
Claim · model-written summary
Drought with higher temperature at ambient CO2 decreased carbon assimilation and chlorophyll fluorescence.
- Taxon
- plantsViridiplantaee0
- Treatment
- Drought‐stressed plants grown under higher temperature at ambient CO 2e0
- Outcome
- net CO 2 assimilation and chlorophyll fluorescencee0
- Direction
- decreasede0
Not reportedComparator
Verbatim
e0“Drought‐stressed plants grown under higher temperature at ambient CO 2 had decreased stem height and diameter, leaf number and area, dry matter, leaf area ratio, shoot/root weight ratio, net CO 2 assimilation and chlorophyll fluorescence.”
Claim · model-written summary
Drought with higher temperature at ambient CO2 increased specific leaf weight, leaf weight ratio, and chlorophyll concentration.
- Taxon
- plantsViridiplantaee0
- Outcome
- specific leaf weight, leaf weight ratio and chlorophyll concentratione0
- Direction
- increasede0
Not reportedTreatmentComparator
Verbatim
e0“However, these plants had increased specific leaf weight, leaf weight ratio and chlorophyll concentration.”
Claim · model-written summary
Elevated CO2 partially reversed inhibition of leaf dry weight accumulation from heat and drought.
- Treatment
- Elevated CO 2e0
- Outcome
- leaf dry weight accumulatione0
- Direction
- partially reversede0
- Comparator
- higher temperature and droughte0
Not reportedTaxon
Verbatim
e0“Elevated CO 2 generally had the opposite effect, and partially reversed the inhibitory effects of higher temperature and drought on leaf dry weight accumulation.”
Claim · model-written summary
Drought stress increased ABA content.
- Taxon
- plantsViridiplantaee0
- Treatment
- drought stresse0
- Outcome
- ABAe0
- Direction
- increasede0
Not reportedComparator
Verbatim
e0“drought stress increased ABA but higher temperature inhibited the ability of plants to produce ABA in response to drought.”
Claim · model-written summary
Higher temperature inhibited canola ABA production in response to drought.
- Taxon
- plantsViridiplantaee0
- Treatment
- higher temperaturee0
- Outcome
- ABA in response to droughte0
- Direction
- inhibitede0
Not reportedComparator
Verbatim
e0“drought stress increased ABA but higher temperature inhibited the ability of plants to produce ABA in response to drought.”
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