Abstract
Cotton (Gossypium hirsutum L. cv Stoneville 213) was grown at 350 and 1000 microliters per liter CO(2). The plants grown at elevated CO(2) concentrations contained large starch pools and showed initial symptoms of visible physical damage. Photosynthetic rates were lower than expected based on instantaneous exposure to high CO(2).A group of plants grown at 1000 microliters per liter CO(2) was switched to 350 microliters per liter CO(2). Starch pools and photosynthetic rates were monitored in the switched plants and in the two unswitched control groups. Photosynthetic rates per unit leaf area recovered to the level of the 350 microliters per liter CO(2) grown control group within four to five days. To assess only nonstomatal limitations to photosynthesis, a measure of photosynthetic efficiencies was calculated (moles CO(2) fixed per square meter per second per mole intercellular CO(2)). Photosynthetic efficiency also recovered to the levels of the 350 microliters per liter CO(2) grown controls within three to four days.Recovery was correlated to a rapid depletion of the starch pool, indicating that the inhibition of photosynthesis is primarily a result of feedback inhibition. However, complete recovery may involve the repair of damage to the chloroplasts caused by excessive starch accumulation. The rapid and complete reversal of photosynthetic inhibition suggests that the appearance of large, strong sinks at certain developmental stages could result in reduction of the large starch accumulations and that photosynthetic rates could recover to near the theoretical capacity during periods of high photosynthate demand.
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Claims 8
Claim · model-written summary
Cotton grown at elevated CO2 had large starch pools and visible physical damage.
- Taxon
- Cotton
Gossypium hirsutume0 - Material
- Stoneville 213e0
- Treatment
- elevated CO(2) concentrationse0
- Outcome
- large starch pools and showed initial symptoms of visible physical damagee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cotton (Gossypium hirsutum L. cv Stoneville 213) was grown at 350 and 1000 microliters per liter CO(2). The plants grown at elevated CO(2) concentrations contained large starch pools and showed initial symptoms of visible physical damage”
Claim · model-written summary
Photosynthetic rates after growth at elevated CO2 were lower than expected from instantaneous high-CO2 exposure.
- Taxon
- CottonGossypium hirsutumt0
- Outcome
- Photosynthetic ratese0
- Direction
- lowere0
- Comparator
- instantaneous exposure to high CO(2)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Photosynthetic rates were lower than expected based on instantaneous exposure to high CO(2)”
t0“Cotton”
Claim · model-written summary
After transfer from 1000 to 350 microliters per liter CO2, cotton leaf-area photosynthetic rates recovered to the 350-grown control level within four to five days.
- Taxon
- CottonGossypium hirsutumt0
- Treatment
- switched to 350 microliters per liter CO(2)e0
- Outcome
- Photosynthetic rates per unit leaf areae1
- Direction
- recoverede1
- Qualifier
- within four to five dayse1
- Comparator
- 350 microliters per liter CO(2) grown control groupe1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A group of plants grown at 1000 microliters per liter CO(2) was switched to 350 microliters per liter CO(2)”
e1“Photosynthetic rates per unit leaf area recovered to the level of the 350 microliters per liter CO(2) grown control group within four to five days”
t0“Cotton”
Claim · model-written summary
Cotton photosynthetic efficiency recovered to the 350-grown control level within three to four days.
- Taxon
- CottonGossypium hirsutumt0
- Treatment
- switched to 350 microliters per liter CO(2)e0
- Outcome
- Photosynthetic efficiencye1
- Direction
- recoverede1
- Qualifier
- within three to four dayse1
- Comparator
- 350 microliters per liter CO(2) grown controlse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“was switched to 350 microliters per liter CO(2)”
e1“Photosynthetic efficiency also recovered to the levels of the 350 microliters per liter CO(2) grown controls within three to four days”
t0“Cotton”
Claim · model-written summary
Recovery of cotton photosynthesis correlated with rapid depletion of starch pools.
- Taxon
- CottonGossypium hirsutumt0
- Compound
- starche0
- Outcome
- Recoverye0
- Qualifier
- rapid depletion of the starch poole0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Recovery was correlated to a rapid depletion of the starch pool”
t0“Cotton”
Claim · model-written summary
The authors attributed cotton photosynthetic inhibition primarily to feedback inhibition associated with starch depletion.
- Taxon
- CottonGossypium hirsutumt0
- Compound
- starche0
- Outcome
- inhibition of photosynthesise0
- Qualifier
- feedback inhibitione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Recovery was correlated to a rapid depletion of the starch pool, indicating that the inhibition of photosynthesis is primarily a result of feedback inhibition”
t0“Cotton”
Claim · model-written summary
The authors proposed that complete recovery may involve repair of chloroplast damage caused by excessive starch accumulation.
- Taxon
- CottonGossypium hirsutumt0
- Compound
- starche0
- Outcome
- complete recoverye0
- Qualifier
- repair of damage to the chloroplastse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“complete recovery may involve the repair of damage to the chloroplasts caused by excessive starch accumulation”
t0“Cotton”
Claim · model-written summary
The authors suggested strong sinks at developmental stages could reduce starch accumulation and restore near-theoretical photosynthesis during high photosynthate demand.
- Taxon
- CottonGossypium hirsutumt0
- Compound
- starche0
- Outcome
- photosynthetic rates could recover to near the theoretical capacitye0
- Qualifier
- large, strong sinks at certain developmental stagese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“large, strong sinks at certain developmental stages could result in reduction of the large starch accumulations and that photosynthetic rates could recover to near the theoretical capacity during periods of high photosynthate demand”
t0“Cotton”
The same questions in other papers
co2 · physiology: photosynthesis · Gossypium hirsutum (cotton)Positive and negative results
8 papers in the same direction as this paper · 3 in the opposite direction
- positive
- negative
- negative
8 papers more in this group
See all 12 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.