Abstract
Biomass allocation to leaf tissues and photosynthetic acclimation to CO2 by cotton were investigated in two experiments. Plants were grown at ambient and elevated CO2 concentrations with growth restricting phosphorus supplies in both experiments and in root restricting pot volumes in the first experiment. In both experiments, elevated CO2 concentrations decreased the maximum carboxylation rate (V-cmax) and the CO2 saturated rate of photosynthesis indicative of photosynthetic acclimation to elevated CO2 concentrations. In the first experiment, the percentage reduction in V-cmax under elevated CO2 concentration was least at a P supply of 2.1 mg P plant(-1), greatest at 6.1 mg P plant(-1), but then decreased at 18.2 mg P plant(-1). The greater acclimation at the middle P supply was associated with a higher ratio of leaf mass to plant mass (LMR) than in other treatments and the lesser acclimation at the highest P treatment coincided with a lower LMR. In the second experiment the reduction in V-cmax at elevated CO2 was less than in the first experiment but was also associated with a greater allocation of dry matter to leaf tissues during growth. In both experiments, V-cmax was not correlated to the relative degree of biomass enhancement at elevated CO2 nor with the degree of root growth restriction in small pots. These data support the hypothesis that acclimation of photosynthesis to elevated CO2 concentrations is mediated by shifts in allocation between leaves and the rest of the plant, induced by environmental conditions during growth, such that carbohydrate supply remains in balance with the utilization capacity of sink tissues.
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Claims 12
Claim · model-written summary
Elevated CO2 decreased maximum carboxylation rate.
- Taxon
- cotton
Gossypium hirsutumt0 - Treatment
- elevated CO2 concentrationse0
- Outcome
- maximum carboxylation rate (V-cmax)e0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“elevated CO2 concentrations decreased the maximum carboxylation rate (V-cmax) and the CO2 saturated rate of photosynthesis”
t0“Cotton”
Claim · model-written summary
Elevated CO2 decreased CO2 saturated photosynthesis.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- elevated CO2 concentrationse0
- Outcome
- CO2 saturated rate of photosynthesise0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“elevated CO2 concentrations decreased the maximum carboxylation rate (V-cmax) and the CO2 saturated rate of photosynthesis”
t0“Cotton”
Claim · model-written summary
V-cmax reduction was least at 2.1 mg P plant(-1).
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- P supply of 2.1 mg P plant(-1)e0
- Outcome
- percentage reduction in V-cmaxe0
- Direction
- leaste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the percentage reduction in V-cmax under elevated CO2 concentration was least at a P supply of 2.1 mg P plant(-1)”
t0“Cotton”
Claim · model-written summary
V-cmax reduction was greatest at 6.1 mg P plant(-1).
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- 6.1 mg P plant(-1)e0
- Outcome
- V-cmaxe0
- Direction
- greateste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the percentage reduction in V-cmax under elevated CO2 concentration was least at a P supply of 2.1 mg P plant(-1), greatest at 6.1 mg P plant(-1)”
t0“Cotton”
Claim · model-written summary
V-cmax reduction decreased at 18.2 mg P plant(-1).
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- 18.2 mg P plant(-1)e0
- Outcome
- V-cmaxe0
- Direction
- decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the percentage reduction in V-cmax under elevated CO2 concentration was least at a P supply of 2.1 mg P plant(-1), greatest at 6.1 mg P plant(-1), but then decreased at 18.2 mg P plant(-1)”
t0“Cotton”
Claim · model-written summary
Greater middle P acclimation was associated with higher leaf mass ratio.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- middle P supplye0
- Outcome
- ratio of leaf mass to plant mass (LMR)e0
- Direction
- highere0
- Comparator
- other treatmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The greater acclimation at the middle P supply was associated with a higher ratio of leaf mass to plant mass (LMR) than in other treatments”
t0“Cotton”
Claim · model-written summary
Lesser acclimation at highest P coincided with lower leaf mass ratio.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- highest P treatmente0
- Outcome
- LMRe0
- Direction
- lowere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the lesser acclimation at the highest P treatment coincided with a lower LMR”
t0“Cotton”
Claim · model-written summary
Second experiment had less V-cmax reduction at elevated CO2 than the first.
- Taxon
- cottonGossypium hirsutumt0
- Outcome
- reduction in V-cmaxe0
- Direction
- lesse0
- Comparator
- first experimente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the reduction in V-cmax at elevated CO2 was less than in the first experiment”
t0“Cotton”
Claim · model-written summary
Second experiment reduction was associated with greater dry matter allocation to leaves.
- Taxon
- cottonGossypium hirsutumt0
- Organ / stage
- leaf tissuese0
- Outcome
- allocation of dry matter to leaf tissuese0
- Direction
- greatere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“was also associated with a greater allocation of dry matter to leaf tissues during growth”
t0“Cotton”
Claim · model-written summary
V-cmax was not correlated with relative biomass enhancement.
- Taxon
- cottonGossypium hirsutumt0
- Outcome
- V-cmaxe0
- Direction
- not correlatede0
- Comparator
- relative degree of biomass enhancemente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“V-cmax was not correlated to the relative degree of biomass enhancement at elevated CO2”
t0“Cotton”
Claim · model-written summary
V-cmax was not correlated with root growth restriction.
- Taxon
- cottonGossypium hirsutumt0
- Organ / stage
- roote0
- Outcome
- V-cmaxe0
- Direction
- not correlatede0
- Setting
- small potse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“V-cmax was not correlated to the relative degree of biomass enhancement at elevated CO2 nor with the degree of root growth restriction in small pots”
t0“Cotton”
Claim · model-written summary
Authors propose leaf allocation shifts mediate photosynthetic acclimation.
- Taxon
- cottonGossypium hirsutumt0
- Outcome
- acclimation of photosynthesise0
- Qualifier
- shifts in allocation between leaves and the rest of the plante0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“acclimation of photosynthesis to elevated CO2 concentrations is mediated by shifts in allocation between leaves and the rest of the plant”
t0“Cotton”
The same questions in other papers
co2 · physiology: photosynthesis · Gossypium hirsutum (cotton)Positive and negative results
2 papers in the same direction as this paper · 9 in the opposite direction
- positive
- positive
- positive
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.