Abstract
ABSTRACT Cotton plants were grown in CO 2 ‐controlled growth chambers in atmospheres of either 35 or 65 Pa CO 2 . A widely accepted model of C 3 leaf photosynthesis was parameterized for leaves from both CO 2 treatments using non‐linear least squares regression techniques, but in order to achieve reasonable fits, it was necessary to include a phosphate limitation resulting from inadequate triose phosphate utilization. Despite the accumulation of large amounts of starch (>50 g m −2 ) in the high CO 2 plants, the photosynthetic characteristics of leaves in both treatments were similar, although the maximum rate of Rubisco activity (Vc max ), estimated from A versus C i response curves measured at 29°C, was ∼10% lower in leaves from plants grown in high CO 2 . The relationship between key model parameters and total leaf N was linear, the only difference between CO 2 treatments being a slight reduction in the slope of the line relating Vc max to leaf N in plants grown at high CO 2 . Stomatal conductance of leaves of plants grown and measured at 65 Pa CO 2 was approximately 32% lower than that of plants grown and measured at 35 Pa. Because photosynthetic capacity of leaves grown in high CO 2 was only slightly less than that of leaves grown in 35 Pa CO 2 , net photosynthesis measured at the growth CO 2 , light and temperature conditions was approximately 25% greater in leaves of plants grown in high CO 2 , despite the reduction in leaf conductance. Greater assimilation rate was one factor allowing plants grown in high CO 2 to incorporate 30% more biomass during the first 36 d of growth.
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Claims 9
Claim · model-written summary
Reasonable model fits required a phosphate limitation from inadequate triose phosphate use.
- Taxon
- cotton
Gossypium hirsutumt0 - Outcome
- reasonable fitse0
- Qualifier
- phosphate limitatione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in order to achieve reasonable fits, it was necessary to include a phosphate limitation resulting from inadequate triose phosphate utilization”
t0“cotton”
Claim · model-written summary
High CO2 cotton accumulated starch above 50 g m −2.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- high CO 2e0
- Outcome
- accumulation of large amounts of starche0
- Value
- >50 g m −2e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the accumulation of large amounts of starch (>50 g m −2 ) in the high CO 2 plants”
t0“cotton”
Claim · model-written summary
Photosynthetic characteristics were similar across CO2 treatments.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- both treatmentse0
- Outcome
- photosynthetic characteristics of leavese0
- Direction
- similare0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the photosynthetic characteristics of leaves in both treatments were similar”
t0“cotton”
Claim · model-written summary
Estimated maximum Rubisco activity was about 10% lower under high CO2.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- high CO 2e0
- Gene
- Rubiscoe0
- Outcome
- maximum rate of Rubisco activitye0
- Direction
- lowere0
- Value
- ∼10%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the maximum rate of Rubisco activity (Vc max ), estimated from A versus C i response curves measured at 29°C, was ∼10% lower in leaves from plants grown in high CO 2”
t0“cotton”
Claim · model-written summary
Key model parameters related linearly to total leaf nitrogen.
- Taxon
- cottonGossypium hirsutumt0
- Organ / stage
- leafe0
- Outcome
- relationship between key model parameters and total leaf Ne0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The relationship between key model parameters and total leaf N was linear”
t0“cotton”
Claim · model-written summary
High CO2 slightly reduced the slope relating Vc max to leaf nitrogen.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- high CO 2e0
- Outcome
- slope of the line relating Vc max to leaf Ne0
- Direction
- reductione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a slight reduction in the slope of the line relating Vc max to leaf N in plants grown at high CO 2”
t0“cotton”
Claim · model-written summary
Stomatal conductance under 65 Pa CO2 was approximately 32% lower than under 35 Pa.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- 65 Pa CO 2e0
- Outcome
- Stomatal conductancee0
- Direction
- lowere0
- Value
- 32%e0
- Comparator
- 35 Pae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Stomatal conductance of leaves of plants grown and measured at 65 Pa CO 2 was approximately 32% lower than that of plants grown and measured at 35 Pa”
t0“cotton”
Claim · model-written summary
Net photosynthesis at growth conditions was approximately 25% greater under high CO2.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- high CO 2e0
- Outcome
- net photosynthesise0
- Direction
- greatere0
- Value
- 25%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“net photosynthesis measured at the growth CO 2 , light and temperature conditions was approximately 25% greater in leaves of plants grown in high CO 2”
t0“cotton”
Claim · model-written summary
High CO2 cotton incorporated 30% more biomass in the first 36 days.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- high CO 2e0
- Outcome
- biomasse0
- Direction
- moree0
- Value
- 30%e0
- Qualifier
- during the first 36 d of growthe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“plants grown in high CO 2 to incorporate 30% more biomass during the first 36 d of growth”
t0“cotton”
The same questions in other papers
co2 · growth · Gossypium hirsutum (cotton)Results differ
17 papers in the same direction as this paper · 4 in the opposite direction · 1 reporting no difference from an alternative
- positive
- positive
- negative
19 papers more in this group
See all 23 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.