Abstract
Net photosynthetic rates (Pns) in leaves were compared between rice plants grown in ambient air control and free-air CO2 enrichment (FACE, about 200 micromol mol(-1) above ambient) treatment rings. When measured at the same CO2 concentration, the Pn of FACE leaves decreased significantly, indicating that photosynthetic acclimation to high CO2 occurs. Although stomatal conductance (Gs) in FACE leaves was markedly decreased, intercellular CO2 concentrations (Ci) were almost the same in FACE and ambient leaves, indicating that the photosynthetic acclimation is not caused by the decreased Gs. Furthermore, carboxylation efficiency and maximal Pn, both light and CO2-saturated Pn, were decreased in FACE leaves, as shown by the Pn-Ci curves. In addition, the soluble protein, Rubisco (ribulose-1,5-bisphosphate caboxylase/oxygenase), and its activase contents as well as the sucrose-phosphate synthase activity decreased significantly, while some soluble sugar, inorganic phosphate, chlorophyll and light-harvesting complex II (LHC II) contents increased in FACE leaves. It appears that the photosynthetic acclimation in rice leaves is related to both ribulose-1,5-bisphosphate (RuBP) carboxylation limitation and RuBP regeneration limitation.
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Claims 9
Claim · model-written summary
At equal measurement CO2, FACE rice leaves had significantly lower net photosynthesis.
- Taxon
- rice
Oryza sativae1 - Organ / stage
- leavese0
- Treatment
- free-air CO2 enrichment (FACE, about 200 micromol mol(-1) above ambient)e1
- Outcome
- Pne0
- Direction
- decreasede0
- Qualifier
- same CO2 concentratione0
- Comparator
- ambient air controle1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When measured at the same CO2 concentration, the Pn of FACE leaves decreased significantly”
e1“rice plants grown in ambient air control and free-air CO2 enrichment (FACE, about 200 micromol mol(-1) above ambient) treatment rings”
Claim · model-written summary
FACE rice leaves showed markedly decreased stomatal conductance.
- Taxon
- riceOryza sativae1
- Treatment
- free-air CO2 enrichmente1
- Outcome
- stomatal conductance (Gs)e0
- Direction
- decreasede0
- Comparator
- ambient air controle1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“stomatal conductance (Gs) in FACE leaves was markedly decreased”
e1“rice plants grown in ambient air control and free-air CO2 enrichment (FACE, about 200 micromol mol(-1) above ambient) treatment rings”
Claim · model-written summary
Intercellular CO2 concentration was almost the same in FACE and ambient rice leaves.
- Taxon
- riceOryza sativae1
- Treatment
- FACEe0
- Outcome
- intercellular CO2 concentrations (Ci)e0
- Direction
- almost the samee0
- Comparator
- ambient leavese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“intercellular CO2 concentrations (Ci) were almost the same in FACE and ambient leaves”
e1“rice plants grown in ambient air control and free-air CO2 enrichment (FACE, about 200 micromol mol(-1) above ambient) treatment rings”
Claim · model-written summary
Carboxylation efficiency and maximal photosynthesis decreased in FACE rice leaves.
- Taxon
- riceOryza sativae1
- Treatment
- FACEe0
- Outcome
- carboxylation efficiency and maximal Pn, both light and CO2-saturated Pne0
- Direction
- decreasede0
- Comparator
- ambient air controle1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“carboxylation efficiency and maximal Pn, both light and CO2-saturated Pn, were decreased in FACE leaves”
e1“rice plants grown in ambient air control and free-air CO2 enrichment (FACE, about 200 micromol mol(-1) above ambient) treatment rings”
Claim · model-written summary
Soluble protein and Rubisco and activase contents decreased significantly in FACE rice leaves.
- Taxon
- riceOryza sativae1
- Treatment
- FACEe1
- Outcome
- soluble protein, Rubisco (ribulose-1,5-bisphosphate caboxylase/oxygenase), and its activase contentse0
- Direction
- decreasede0
- Comparator
- ambient air controle1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the soluble protein, Rubisco (ribulose-1,5-bisphosphate caboxylase/oxygenase), and its activase contents as well as the sucrose-phosphate synthase activity decreased significantly”
e1“rice plants grown in ambient air control and free-air CO2 enrichment (FACE, about 200 micromol mol(-1) above ambient) treatment rings”
Claim · model-written summary
Sucrose-phosphate synthase activity decreased significantly in FACE rice leaves.
- Taxon
- riceOryza sativae1
- Treatment
- FACEe1
- Outcome
- sucrose-phosphate synthase activitye0
- Direction
- decreasede0
- Comparator
- ambient air controle1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the sucrose-phosphate synthase activity decreased significantly”
e1“rice plants grown in ambient air control and free-air CO2 enrichment (FACE, about 200 micromol mol(-1) above ambient) treatment rings”
Claim · model-written summary
Soluble sugar, inorganic phosphate, and chlorophyll contents increased in FACE rice leaves.
- Taxon
- riceOryza sativae1
- Treatment
- FACEe0
- Outcome
- some soluble sugar, inorganic phosphate, chlorophylle0
- Direction
- increasede0
- Comparator
- ambient air controle1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“some soluble sugar, inorganic phosphate, chlorophyll and light-harvesting complex II (LHC II) contents increased in FACE leaves”
e1“rice plants grown in ambient air control and free-air CO2 enrichment (FACE, about 200 micromol mol(-1) above ambient) treatment rings”
Claim · model-written summary
Light-harvesting complex II content increased in FACE rice leaves.
- Taxon
- riceOryza sativae1
- Treatment
- FACEe0
- Outcome
- light-harvesting complex II (LHC II) contentse0
- Direction
- increasede0
- Comparator
- ambient air controle1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“light-harvesting complex II (LHC II) contents increased in FACE leaves”
e1“rice plants grown in ambient air control and free-air CO2 enrichment (FACE, about 200 micromol mol(-1) above ambient) treatment rings”
Claim · model-written summary
The authors relate rice photosynthetic acclimation to both RuBP carboxylation and regeneration limitations.
- Taxon
- riceOryza sativae0
- Organ / stage
- leavese0
- Outcome
- photosynthetic acclimatione0
- Qualifier
- ribulose-1,5-bisphosphate (RuBP) carboxylation limitation and RuBP regeneration limitatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the photosynthetic acclimation in rice leaves is related to both ribulose-1,5-bisphosphate (RuBP) carboxylation limitation and RuBP regeneration limitation.”
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