Abstract
Abstract The present experiment was an attempt to study the differences between photosynthetic responses of pot‐grown and field‐grown soybean [ Glycine max (L.) Merr., ‘Bragg’] plants to atmospheric CO 2 enrichment at six levels of irradiance and four leaf temperatures. Plants were grown in field soil or in pots containing an artificial substrate at five elevated atmospheric CO 2 levels and two water regimes in open top field chambers. Under well‐watered conditions plants grown in the pots had lower stomatal conductances and lower rates of net photosynthesis than plants grown in the field. However, the field‐grown plants responded to a less extent to increasing atmospheric CO 2 concentration than pot‐grown plants. The photosynthesis‐ irrdiance relationships were linear in the field‐grown plants and curvilinear in the pot‐grown plants. At the highest irradiance level tested (1400 µmol m −2 s −1 ), the field‐grown plants had maximum net photosynthetic rates of 43 and 48 mg CO 2 dm −2 h −1 at 332 and 623 µL L −1 CO 2 respectively. The pot‐grown plants were irradiance saturated at a level of 700 µmol m −2 s −1 and net leaf photosynthetic rates were 18 and 28 mg CO 2 dm −2 h −1 at 332 and 623 µL L −1 CO 2 , respectively. Water stress caused a reduction in both stomatal conductance and net photosynthetic rate in the leaves of pot‐grown plants. The effect of leaf temperature on net photosynthethis and stomatal conductance depended upon the atmospheric CO 2 concentration and rooting media. High temperature increased net photosynthetic response to CO 2 enrichment at high CO 2 concentrations but not at low CO 2 concentrations.
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Claims 15
Claim · model-written summary
Pot grown plants had lower stomatal conductance than field grown plants when watered.
- Taxon
- Soybeans
Glycine maxt0 - Treatment
- plants grown in the potse0
- Outcome
- stomatal conductancese0
- Direction
- lowere0
- Comparator
- plants grown in the fielde0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under well‐watered conditions plants grown in the pots had lower stomatal conductances and lower rates of net photosynthesis than plants grown in the field”
t0“Soybeans”
Claim · model-written summary
Pot grown plants had lower net photosynthesis than field grown plants when watered.
- Taxon
- SoybeansGlycine maxt0
- Treatment
- plants grown in the potse0
- Outcome
- rates of net photosynthesise0
- Direction
- lowere0
- Comparator
- plants grown in the fielde0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under well‐watered conditions plants grown in the pots had lower stomatal conductances and lower rates of net photosynthesis than plants grown in the field”
t0“Soybeans”
Claim · model-written summary
Field grown plants responded less to rising CO2 than pot grown plants.
- Taxon
- SoybeansGlycine maxt0
- Treatment
- increasing atmospheric CO 2 concentratione0
- Outcome
- respondede0
- Direction
- less extente0
- Comparator
- pot‐grown plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“field‐grown plants responded to a less extent to increasing atmospheric CO 2 concentration than pot‐grown plants”
t0“Soybeans”
Claim · model-written summary
Photosynthesis irradiance relationships were linear in field grown plants.
- Taxon
- SoybeansGlycine maxt0
- Treatment
- field‐grown plantse0
- Outcome
- photosynthesis‐ irrdiance relationshipse0
- Qualifier
- lineare0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“photosynthesis‐ irrdiance relationships were linear in the field‐grown plants”
t0“Soybeans”
Claim · model-written summary
Photosynthesis irradiance relationships were curvilinear in pot grown plants.
- Taxon
- SoybeansGlycine maxt0
- Treatment
- pot‐grown plantse0
- Outcome
- curvilineare0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“curvilinear in the pot‐grown plants”
t0“Soybeans”
Claim · model-written summary
Field grown maximum net photosynthesis was 43 mg CO 2 dm −2 h −1 at 332 µL L −1 CO2.
- Taxon
- SoybeansGlycine maxt0
- Treatment
- field‐grown plantse0
- Outcome
- maximum net photosynthetic ratese0
- Direction
- maximume0
- Value
- 43e0
- Qualifier
- 332e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“field‐grown plants had maximum net photosynthetic rates of 43 and 48 mg CO 2 dm −2 h −1 at 332 and 623 µL L −1 CO 2 respectively”
t0“Soybeans”
Claim · model-written summary
Field grown maximum net photosynthesis was 48 mg CO 2 dm −2 h −1 at 623 µL L −1 CO2.
- Taxon
- SoybeansGlycine maxt0
- Treatment
- field‐grown plantse0
- Outcome
- maximum net photosynthetic ratese0
- Direction
- maximume0
- Value
- 48 mg CO 2 dm −2 h −1e0
- Qualifier
- 623 µL L −1 CO 2e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“field‐grown plants had maximum net photosynthetic rates of 43 and 48 mg CO 2 dm −2 h −1 at 332 and 623 µL L −1 CO 2 respectively”
t0“Soybeans”
Claim · model-written summary
Pot grown plants saturated at irradiance of 700 µmol m −2 s −1.
- Taxon
- SoybeansGlycine maxt0
- Treatment
- pot‐grown plantse0
- Outcome
- irradiance saturatede0
- Value
- 700 µmol m −2 s −1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“pot‐grown plants were irradiance saturated at a level of 700 µmol m −2 s −1”
t0“Soybeans”
Claim · model-written summary
Pot grown net leaf photosynthetic rate was 18 mg CO 2 dm −2 h −1.
- Taxon
- SoybeansGlycine maxt0
- Outcome
- net leaf photosynthetic ratese0
- Value
- 18e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“net leaf photosynthetic rates were 18 and 28 mg CO 2 dm −2 h −1 at 332 and 623 µL L −1 CO 2 , respectively”
t0“Soybeans”
Claim · model-written summary
Pot grown net leaf photosynthetic rate was 28 mg CO 2 dm −2 h −1.
- Taxon
- SoybeansGlycine maxt0
- Outcome
- net leaf photosynthetic ratese0
- Value
- 28 mg CO 2 dm −2 h −1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“net leaf photosynthetic rates were 18 and 28 mg CO 2 dm −2 h −1 at 332 and 623 µL L −1 CO 2 , respectively”
t0“Soybeans”
Claim · model-written summary
Water stress reduced stomatal conductance in pot grown soybean leaves.
- Taxon
- SoybeansGlycine maxt0
- Organ / stage
- leavese0
- Treatment
- Water stresse0
- Outcome
- stomatal conductancee0
- Direction
- reductione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Water stress caused a reduction in both stomatal conductance and net photosynthetic rate in the leaves of pot‐grown plants”
t0“Soybeans”
Claim · model-written summary
Water stress reduced net photosynthetic rate in pot grown soybean leaves.
- Taxon
- SoybeansGlycine maxt0
- Organ / stage
- leavese0
- Treatment
- Water stresse0
- Outcome
- net photosynthetic ratee0
- Direction
- reductione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Water stress caused a reduction in both stomatal conductance and net photosynthetic rate in the leaves of pot‐grown plants”
t0“Soybeans”
Claim · model-written summary
Leaf temperature effects on photosynthesis and conductance depended on CO2 concentration and rooting medium.
- Taxon
- SoybeansGlycine maxt0
- Treatment
- leaf temperaturee0
- Outcome
- net photosynthethis and stomatal conductancee0
- Qualifier
- atmospheric CO 2 concentration and rooting mediae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“effect of leaf temperature on net photosynthethis and stomatal conductance depended upon the atmospheric CO 2 concentration and rooting media”
t0“Soybeans”
Claim · model-written summary
High temperature increased the photosynthetic response to CO2 enrichment at high CO2 concentration.
- Taxon
- SoybeansGlycine maxt0
- Treatment
- High temperaturee0
- Outcome
- net photosynthetic response to CO 2 enrichmente0
- Direction
- increasede0
- Qualifier
- high CO 2 concentrationse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“High temperature increased net photosynthetic response to CO 2 enrichment at high CO 2 concentrations”
t0“Soybeans”
Claim · model-written summary
High temperature did not increase that response at low CO2 concentration.
- Taxon
- SoybeansGlycine maxt0
- Treatment
- High temperaturee0
- Outcome
- net photosynthetic responsee0
- Qualifier
- low CO 2 concentrationse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“High temperature increased net photosynthetic response to CO 2 enrichment at high CO 2 concentrations but not at low CO 2 concentrations”
t0“Soybeans”