Abstract
Abstract This study was conducted to determine the response in leaf growth and gas exchange of soybean ( Glycine max Merr.) to the combined effects of water deficits and carbon dioxide (CO 2 ) enrichment. Plants grown in pots were allowed to develop initially in a glasshouse under ambient CO 2 and well‐watered conditions. Four‐week old plants were transferred into two different glasshouses with either ambient (360 μmol mol ‐1 ) or elevated (700 μmol mol ‐1 ) CO 2 . Following a 2‐day acclimation period, the soil of the drought‐stressed pots was allowed to dry slowly over a 2‐week period. The stressed pots were watered daily so that the soil dried at an equivalent rate under the two CO 2 levels. Elevated [CO 2 ] decreased water loss rate and increased leaf area development and photosynthetic rate under both well‐watered and drought‐stressed conditions. There was, however, no significant effect of [CO 2 ] in the response relative to soil water content of normalized leaf gas exchange and leaf area. The drought response based on soil water content for transpiration, leaf area, and photosynthesis provide an effective method for describing the responses of soybean physiological processes to the available soil water, independent of [CO 2 ].
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Claims 5
Claim · model-written summary
Elevated CO2 decreased soybean water loss under well watered and drought conditions.
- Taxon
- soybean
Glycine maxt0 - Treatment
- Elevated [CO 2 ]e0
- Outcome
- water loss ratee0
- Direction
- decreasede0
- Comparator
- well‐watered and drought‐stressed conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Elevated [CO 2 ] decreased water loss rate and increased leaf area development and photosynthetic rate under both well‐watered and drought‐stressed conditions”
t0“soybean”
Claim · model-written summary
Elevated CO2 increased soybean leaf area development in both watering conditions.
- Taxon
- soybeanGlycine maxt0
- Treatment
- Elevated [CO 2 ]e0
- Outcome
- leaf area developmente0
- Direction
- increasede0
- Comparator
- well‐watered and drought‐stressed conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Elevated [CO 2 ] decreased water loss rate and increased leaf area development and photosynthetic rate under both well‐watered and drought‐stressed conditions”
t0“soybean”
Claim · model-written summary
Elevated CO2 increased soybean photosynthetic rate in both watering conditions.
- Taxon
- soybeanGlycine maxt0
- Treatment
- Elevated [CO 2 ]e0
- Outcome
- photosynthetic ratee0
- Direction
- increasede0
- Comparator
- well‐watered and drought‐stressed conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Elevated [CO 2 ] decreased water loss rate and increased leaf area development and photosynthetic rate under both well‐watered and drought‐stressed conditions”
t0“soybean”
Claim · model-written summary
CO2 level had no significant effect on normalized leaf gas exchange and leaf area responses relative to soil water content.
- Treatment
- [CO 2 ]e0
- Outcome
- normalized leaf gas exchange and leaf areae0
- Direction
- no significant effecte0
Not reportedTaxon
Verbatim
e0“no significant effect of [CO 2 ] in the response relative to soil water content of normalized leaf gas exchange and leaf area”
Claim · model-written summary
Soil water based drought response of transpiration, leaf area and photosynthesis effectively described soybean physiology independently of CO2 level.
- Taxon
- soybeanGlycine maxe0
- Outcome
- effective methode0
- Comparator
- independent of [CO 2 ]e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The drought response based on soil water content for transpiration, leaf area, and photosynthesis provide an effective method for describing the responses of soybean physiological processes to the available soil water, independent of [CO 2 ]”
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