Abstract
Abstract The purpose of this investigation was to determine whether long‐term adaptation to CO 2 pretreatment affects canopy response to short‐term CO 2 treatments. Soybeans [ Glycine max (L.) Merr. cv. Bragg] were grown in outdoor controlled environment chambers from seedling onwards at 330 and 800 μmol CO 2 per mole air. After 68 days, the CO 2 treatment levels were temporarily reversed for 5 days. Before the step change in CO 2 concentrations, CER at high light in elevated CO 2 treatments was 85% greater than in ambient treatments. After the reversal, canopies in the newly enriched chambers had CO 2 fixation rates 75% greater than in the chambers that were switched to ambient CO 2 concentrations. Furthermore, the CER responses to PAR were similar whether the canopy was acclimated or newly exposed to the particular CO 2 level. Before treatment reversal, transpiration rates were essentially equivalent in the two treatments. Stomatal resistances of leaves were higher in elevated CO 2 , but the acclimated enriched canopies had developed additional leaf area resulting in similar total canopy resistances to transpiration. After reversal, absolute water use declined by 18% in the canopies with CO 2 increased from 330 to 800 μmol mol −1 and increased by 36% in the canopies with CO 2 decreased from 800 to 330 μmol mol −1 . It was concluded that short‐term exposure to different CO 2 treatments adequately estimated long‐term canopy CER response to CO 2 level, but did not adequately predict long‐term canopy transpiration response.
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Claims 11
Claim · model-written summary
Before reversal, high-light CER was 85% greater under elevated CO2.
- Taxon
- Soybeans
Glycine maxe1 - Material
- Bragge1
- Treatment
- elevated CO 2 treatmentse0
- Outcome
- CER at high lighte0
- Direction
- greatere0
- Value
- 85%e0
- Comparator
- ambient treatmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Before the step change in CO 2 concentrations, CER at high light in elevated CO 2 treatments was 85% greater than in ambient treatments.”
e1“Soybeans [ Glycine max (L.) Merr. cv. Bragg]”
Claim · model-written summary
After reversal, newly enriched canopies had 75% greater CO2 fixation rates.
- Taxon
- SoybeansGlycine maxe1
- Treatment
- newly enriched chamberse0
- Outcome
- CO 2 fixation ratese0
- Direction
- greatere0
- Value
- 75%e0
- Comparator
- chambers that were switched to ambient CO 2 concentrationse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“After the reversal, canopies in the newly enriched chambers had CO 2 fixation rates 75% greater than in the chambers that were switched to ambient CO 2 concentrations.”
e1“Soybeans [ Glycine max (L.) Merr. cv. Bragg]”
Claim · model-written summary
CER responses to PAR were similar with acclimated and newly exposed canopies.
- Taxon
- SoybeansGlycine maxe1
- Treatment
- newly exposede0
- Outcome
- CER responses to PARe0
- Direction
- similare0
- Comparator
- acclimatede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the CER responses to PAR were similar whether the canopy was acclimated or newly exposed to the particular CO 2 level”
e1“Soybeans [ Glycine max (L.) Merr. cv. Bragg]”
Claim · model-written summary
Before reversal, transpiration rates were essentially equivalent between treatments.
- Taxon
- SoybeansGlycine maxe1
- Treatment
- 800 μmol CO 2 per mole aire2
- Outcome
- transpiration ratese0
- Direction
- essentially equivalente0
- Comparator
- 330e2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Before treatment reversal, transpiration rates were essentially equivalent in the two treatments.”
e1“Soybeans [ Glycine max (L.) Merr. cv. Bragg]”
e2“at 330 and 800 μmol CO 2 per mole air”
Claim · model-written summary
Leaf stomatal resistance was higher under elevated CO2.
- Taxon
- SoybeansGlycine maxe1
- Treatment
- elevated CO 2e0
- Outcome
- Stomatal resistances of leavese0
- Direction
- highere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Stomatal resistances of leaves were higher in elevated CO 2”
e1“Soybeans [ Glycine max (L.) Merr. cv. Bragg]”
Claim · model-written summary
Acclimated enriched canopies developed additional leaf area.
- Taxon
- SoybeansGlycine maxe1
- Treatment
- acclimated enrichede0
- Outcome
- leaf areae0
- Direction
- additionale0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the acclimated enriched canopies had developed additional leaf area”
e1“Soybeans [ Glycine max (L.) Merr. cv. Bragg]”
Claim · model-written summary
Total canopy resistance to transpiration remained similar between treatments.
- Taxon
- SoybeansGlycine maxe1
- Treatment
- 800 μmol CO 2 per mole aire2
- Outcome
- total canopy resistances to transpiratione0
- Direction
- similare0
- Comparator
- 330e2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“resulting in similar total canopy resistances to transpiration”
e1“Soybeans [ Glycine max (L.) Merr. cv. Bragg]”
e2“at 330 and 800 μmol CO 2 per mole air”
Claim · model-written summary
Increasing CO2 from 330 to 800 reduced absolute water use by 18%.
- Taxon
- SoybeansGlycine maxe1
- Treatment
- CO 2 increased from 330 to 800 μmol mol −1e0
- Outcome
- absolute water usee0
- Direction
- declinede0
- Value
- 18%e0
- Comparator
- 330e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“absolute water use declined by 18% in the canopies with CO 2 increased from 330 to 800 μmol mol −1”
e1“Soybeans [ Glycine max (L.) Merr. cv. Bragg]”
Claim · model-written summary
Reducing CO2 from 800 to 330 increased absolute water use by 36%.
- Taxon
- SoybeansGlycine maxe2
- Treatment
- CO 2 decreased from 800 to 330 μmol mol −1e0
- Outcome
- absolute water usee1
- Direction
- increasede0
- Value
- 36%e0
- Comparator
- 800e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increased by 36% in the canopies with CO 2 decreased from 800 to 330 μmol mol −1”
e1“absolute water use declined by 18%”
e2“Soybeans [ Glycine max (L.) Merr. cv. Bragg]”
Claim · model-written summary
Short-term CO2 exposure adequately estimated long-term canopy CER response.
- Taxon
- SoybeansGlycine maxe1
- Outcome
- long‐term canopy CER response to CO 2 levele0
- Comparator
- short‐term exposure to different CO 2 treatmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“short‐term exposure to different CO 2 treatments adequately estimated long‐term canopy CER response to CO 2 level”
e1“Soybeans [ Glycine max (L.) Merr. cv. Bragg]”
Claim · model-written summary
Short-term CO2 exposure did not adequately predict long-term canopy transpiration response.
- Taxon
- SoybeansGlycine maxe2
- Outcome
- long‐term canopy transpiration responsee0
- Comparator
- short‐term exposure to different CO 2 treatmentse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“did not adequately predict long‐term canopy transpiration response”
e1“short‐term exposure to different CO 2 treatments”
e2“Soybeans [ Glycine max (L.) Merr. cv. Bragg]”
The same questions in other papers
co2 · physiology: gas exchange · Glycine max (soybean)Positive and negative results
7 papers in the same direction as this paper · 3 reporting no difference from an alternative
- negative
- positive
- positive
7 papers more in this group
See all 11 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.