Abstract
Soybean ( Glycine max cv. Clark) was grown at both ambient (ca 350 μmol mol −1 ) and elevated (ca 700 μmol mol −1 ) CO 2 concentration at 5 growth temperatures (constant day/night temperatures of 20, 25, 30, 35 and 40°C) for 17–22 days after sowing to determine the interaction between temperature and CO 2 concentration on photosynthesis (measured as A, the rate of CO 2 assimilation per unit leaf area) at both the single leaf and whole plant level. Single leaves of soybean demonstrated increasingly greater stimulation of A at elevated CO 2 as temperature increased from 25 to 35°C (i.e. optimal growth rates). At 40°C, primary leaves failed to develop and plants eventually died. In contrast, for both whole plant A and total biomass production, increasing temperature resulted in less stimulation by elevated CO 2 concentration. For whole plants, increased CO 2 stimulated leaf area more as growth temperature increased. Differences between the response of A to elevated CO 2 for single leaves and whole plants may be related to increased self‐shading experienced by whole plants at elevated CO 2 as temperature increased. Results from the present study suggest that self‐shading could limit the response of CO 2 assimilation rate and the growth response of soybean plants if temperature and CO 2 increase concurrently, and illustrate that light may be an important consideration in predicting the relative stimulation of photosynthesis by elevated CO 2 at the whole plant level.
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Claims 8
Claim · model-written summary
Elevated CO2 stimulation of single-leaf assimilation increased from 25 to 35°C.
- Taxon
- soybean
Glycine maxe0 - Treatment
- elevated CO 2e0
- Outcome
- Ae0
- Direction
- increasingly greater stimulatione0
- Comparator
- temperature increased from 25 to 35°Ce0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Single leaves of soybean demonstrated increasingly greater stimulation of A at elevated CO 2 as temperature increased from 25 to 35°C”
Claim · model-written summary
Primary leaves failed to develop at 40°C.
- Taxon
- SoybeanGlycine maxt0
- Organ / stage
- primary leavese0
- Outcome
- failed to develope0
- Qualifier
- 40°Ce0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At 40°C, primary leaves failed to develop”
t0“soybean”
Claim · model-written summary
Soybean plants eventually died at 40°C.
- Taxon
- SoybeanGlycine maxt0
- Outcome
- plants eventually diede0
- Qualifier
- 40°Ce0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At 40°C, primary leaves failed to develop and plants eventually died”
t0“soybean”
Claim · model-written summary
Elevated CO2 stimulated whole-plant assimilation less as temperature increased.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- elevated CO 2 concentratione0
- Outcome
- whole plant Ae0
- Direction
- less stimulatione0
- Comparator
- increasing temperaturee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“for both whole plant A and total biomass production, increasing temperature resulted in less stimulation by elevated CO 2 concentration”
t0“soybean”
Claim · model-written summary
Elevated CO2 stimulated biomass less as temperature increased.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- elevated CO 2 concentratione0
- Outcome
- total biomass productione0
- Direction
- less stimulatione0
- Comparator
- increasing temperaturee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“for both whole plant A and total biomass production, increasing temperature resulted in less stimulation by elevated CO 2 concentration”
t0“soybean”
Claim · model-written summary
Elevated CO2 stimulated whole-plant leaf area more as temperature increased.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- increased CO 2e0
- Outcome
- leaf areae0
- Direction
- stimulatede0
- Comparator
- growth temperature increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“For whole plants, increased CO 2 stimulated leaf area more as growth temperature increased”
t0“soybean”
Claim · model-written summary
Self-shading may explain divergent leaf and whole-plant assimilation responses.
- Taxon
- SoybeanGlycine maxt0
- Outcome
- response of Ae0
- Qualifier
- increased self‐shadinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Differences between the response of A to elevated CO 2 for single leaves and whole plants may be related to increased self‐shading experienced by whole plants at elevated CO 2 as temperature increased”
t0“soybean”
Claim · model-written summary
Self-shading could limit assimilation and growth response under joint CO2 and temperature increase.
- Taxon
- soybeanGlycine maxe0
- Outcome
- response of CO 2 assimilation rate and the growth responsee0
- Qualifier
- self‐shadinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“self‐shading could limit the response of CO 2 assimilation rate and the growth response of soybean plants if temperature and CO 2 increase concurrently”
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