Abstract
Summary Season‐long effects of elevated CO 2 concentration ([CO 2 ]) on the carbon balance of the rice ( Oryza sativa ) canopy are reported here. The experiment was conducted in six sunlit, semiclosed growth chambers for an entire growing season. Rice plants (cv. Nipponbare) were grown at 350 µmol mol −1 [CO 2 ] (ambient) in three chambers, or at 650 µmol mol −1 (elevated) in the other three chambers. Canopy net photosynthesis and night‐time respiration were determined in the chambers by mass balance. Both canopy gross photosynthesis and total respiration, through the entire growing season, were increased by the CO 2 enrichment. But CO 2 ‐induced variations in canopy carbon gain were mainly caused by changes in canopy photosynthesis. The enhancement of daily canopy gross photosynthesis by elevated [CO 2 ] was 33.4% for the first 3 week, but it declined gradually and disappeared by heading. Enhancement of daily net carbon gain also decreased as rice plants grew. These results show that the increase in rice biomass by elevated [CO 2 ] results more from the increase in carbon gain at early rather than later stages of growth.
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Claims 7
Claim · model-written summary
CO2 enrichment increased canopy gross photosynthesis throughout the growing season.
- Taxon
- rice
Oryza sativae1 - Organ / stage
- canopye0
- Treatment
- CO 2 enrichmente0
- Outcome
- canopy gross photosynthesise0
- Direction
- increasede0
- Comparator
- ambiente2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Both canopy gross photosynthesis and total respiration, through the entire growing season, were increased by the CO 2 enrichment.”
e1“rice ( Oryza sativa ) canopy”
e2“350 µmol mol −1 [CO 2 ] (ambient)”
Claim · model-written summary
CO2 enrichment increased total respiration throughout the growing season.
- Taxon
- riceOryza sativae1
- Treatment
- CO 2 enrichmente0
- Outcome
- total respiratione0
- Direction
- increasede0
- Comparator
- ambiente2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Both canopy gross photosynthesis and total respiration, through the entire growing season, were increased by the CO 2 enrichment.”
e1“rice ( Oryza sativa ) canopy”
e2“350 µmol mol −1 [CO 2 ] (ambient)”
Claim · model-written summary
CO2-induced changes in canopy carbon gain were mainly caused by changes in canopy photosynthesis.
- Taxon
- riceOryza sativae1
- Outcome
- canopy carbon gaine0
- Qualifier
- changes in canopy photosynthesise0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“CO 2 ‐induced variations in canopy carbon gain were mainly caused by changes in canopy photosynthesis.”
e1“rice ( Oryza sativa ) canopy”
Claim · model-written summary
Elevated CO2 enhanced daily canopy gross photosynthesis by 33.4% during the first three weeks.
- Taxon
- riceOryza sativae1
- Treatment
- elevated [CO 2 ]e0
- Outcome
- daily canopy gross photosynthesise0
- Direction
- enhancemente0
- Value
- 33.4%e0
- Qualifier
- first 3 weeke0
- Comparator
- ambiente2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The enhancement of daily canopy gross photosynthesis by elevated [CO 2 ] was 33.4% for the first 3 week”
e1“rice ( Oryza sativa ) canopy”
e2“350 µmol mol −1 [CO 2 ] (ambient)”
Claim · model-written summary
The enhancement of daily canopy gross photosynthesis declined gradually and disappeared by heading.
- Taxon
- riceOryza sativae1
- Organ / stage
- headinge0
- Outcome
- enhancement of daily canopy gross photosynthesise0
- Direction
- declined gradually and disappearede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The enhancement of daily canopy gross photosynthesis by elevated [CO 2 ] was 33.4% for the first 3 week, but it declined gradually and disappeared by heading.”
e1“rice ( Oryza sativa ) canopy”
Claim · model-written summary
Enhancement of daily net carbon gain decreased as rice grew.
- Taxon
- riceOryza sativae0
- Outcome
- Enhancement of daily net carbon gaine0
- Direction
- decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Enhancement of daily net carbon gain also decreased as rice plants grew.”
Claim · model-written summary
The elevated CO2 biomass increase is attributed more to early than late carbon gain.
- Taxon
- riceOryza sativae0
- Treatment
- elevated [CO 2 ]e0
- Outcome
- increase in rice biomasse0
- Qualifier
- increase in carbon gain at early rather than later stages of growthe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the increase in rice biomass by elevated [CO 2 ] results more from the increase in carbon gain at early rather than later stages of growth.”
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
- negative
- no effect
- no effect
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.