Abstract
Rice ( Oryza sativa L. cv. IR72) was grown at three different CO 2 concentrations (ambient, ambient + 200 μmol mol −1 , ambient + 300 μmol mol −1 ) at two different growth temperatures (ambient, ambient + 4°C) from sowing to maturity to determine longterm photosynthetic acclimation to elevated CO 2 with and without increasing temperature. Single leaves of rice showed a cooperative enhancement of photosynthetic rate with elevated CO 2 and temperature during tillering, relative to the elevated CO 2 condition alone. However, after flowering, the degree of photosynthetic stimulation by elevated CO 2 was reduced for the ambient + 4°C treatment. This increasing insensitivity to CO 2 appeared to be accompanied by a reduction in ribulose‐1.5‐bisphosphate carboxylase/oxygenase (Rubisco) activity and/or concentration as evidenced by the reduction in the assimilation (A) to internal CO 2 (C 1 ) response curve. The reproductive response (e.g. percent filled grains, panicle weight) was reduced at the higher growth temperature and presumably reflects a greater increase in floral sterility. Results indicate that while CO 2 and temperature could act synergistically at the biochemical level, the direct effect of temperature on floral development with a subsequent reduction in carbon utilization may change sink strength so as to limit photosynthetic stimulation by elevated CO 2 concentration.
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Claims 5
Claim · model-written summary
Elevated CO2 and temperature enhanced tillering photosynthesis relative to elevated CO2 alone.
- Taxon
- rice
Oryza sativae1 - Organ / stage
- during tilleringe1
- Treatment
- elevated CO 2 and temperaturee1
- Outcome
- photosynthetic ratee1
- Direction
- enhancemente1
- Comparator
- elevated CO 2 condition alonee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rice ( Oryza sativa L. cv. IR72)”
e1“Single leaves of rice showed a cooperative enhancement of photosynthetic rate with elevated CO 2 and temperature during tillering, relative to the elevated CO 2 condition alone.”
Claim · model-written summary
After flowering, elevated temperature reduced CO2 photosynthetic stimulation.
- Taxon
- RiceOryza sativae0
- Organ / stage
- after floweringe1
- Treatment
- ambient + 4°C treatmente1
- Outcome
- degree of photosynthetic stimulation by elevated CO 2e1
- Direction
- reducede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rice ( Oryza sativa L. cv. IR72)”
e1“after flowering, the degree of photosynthetic stimulation by elevated CO 2 was reduced for the ambient + 4°C treatment.”
Claim · model-written summary
The insensitivity coincided with reduced Rubisco activity or concentration.
- Taxon
- RiceOryza sativae0
- Gene
- ribulose‐1.5‐bisphosphate carboxylase/oxygenase (Rubisco)e1
- Outcome
- ribulose‐1.5‐bisphosphate carboxylase/oxygenase (Rubisco) activity and/or concentratione1
- Direction
- reductione1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rice ( Oryza sativa L. cv. IR72)”
e1“This increasing insensitivity to CO 2 appeared to be accompanied by a reduction in ribulose‐1.5‐bisphosphate carboxylase/oxygenase (Rubisco) activity and/or concentration as evidenced by the reduction in the assimilation (A) to internal CO 2 (C 1 ) response curve.”
Claim · model-written summary
Higher temperature reduced percent filled grains and panicle weight.
- Taxon
- RiceOryza sativae0
- Treatment
- higher growth temperaturee1
- Outcome
- percent filled grains, panicle weighte1
- Direction
- reducede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rice ( Oryza sativa L. cv. IR72)”
e1“The reproductive response (e.g. percent filled grains, panicle weight) was reduced at the higher growth temperature and presumably reflects a greater increase in floral sterility.”
Claim · model-written summary
Authors attribute the reproductive reduction to greater floral sterility.
- Taxon
- RiceOryza sativae0
- Treatment
- higher growth temperaturee1
- Outcome
- reproductive responsee1
- Qualifier
- greater increase in floral sterilitye1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rice ( Oryza sativa L. cv. IR72)”
e1“The reproductive response (e.g. percent filled grains, panicle weight) was reduced at the higher growth temperature and presumably reflects a greater increase in floral sterility.”
The same questions in other papers
co2 · physiology: photosynthesis · Oryza sativa (rice)Results differ
44 papers in the same direction as this paper · 16 in the opposite direction · 1 reporting no difference from an alternative
- positive
- negative
- negative
58 papers more in this group
See all 62 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.