Abstract
The effects of growth CO2 levels on the photosynthetic rates; the amounts of ribulose-1,5-bisphosphate carboxylase (Rubisco), chlorophyll (Chl), and cytochrome f; sucrose phosphate synthase activity; and total N content were examined in young, fully expanded leaves of rice (Oryza sativa L.). The plants were grown hydroponically under two CO2 partial pressures of 36 and 100 Pa at three N concentrations. The light-saturated photosynthesis at 36 Pa CO2 was lower in the plants grown in 100 Pa CO2 than those grown in 36 Pa CO2. Similarly, the amounts of Rubisco, Chl, and total N were decreased in the leaves of the plants grown in 100 Pa CO2. However, regression analysis showed no differences between the two CO2 treatments in the relationship between photosynthesis and total N or in the relationship between Rubisco and Chl and total N. Although a relative decrease in Rubisco to cytochrome f or sucrose phosphate synthase was found in the plants grown in 100 Pa CO2, this was the result of a decrease in total N content by CO2 enrichment. The activation state of Rubisco was also unaffected by growth CO2 levels. Thus, decreases in the photosynthetic capacity of the plants grown in 100 Pa CO2 could be simply accounted for by a decrease in the absolute amount of leaf N.
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Claims 8
Claim · model-written summary
Light-saturated photosynthesis at 36 Pa was lower in rice grown at 100 Pa CO2 than in rice grown at 36 Pa CO2.
- Taxon
- Rice
Oryza sativat0 - Treatment
- 100 Pa CO2e0
- Outcome
- light-saturated photosynthesise0
- Direction
- lowere0
- Comparator
- 36 Pa CO2e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The light-saturated photosynthesis at 36 Pa CO2 was lower in the plants grown in 100 Pa CO2 than those grown in 36 Pa CO2.”
t0“Rice Leaves”
Claim · model-written summary
Rice grown at 100 Pa CO2 had decreased leaf Rubisco, chlorophyll, and total N.
- Taxon
- RiceOryza sativat0
- Organ / stage
- leavese0
- Treatment
- 100 Pa CO2e0
- Outcome
- amounts of Rubisco, Chl, and total Ne0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the amounts of Rubisco, Chl, and total N were decreased in the leaves of the plants grown in 100 Pa CO2”
t0“Rice Leaves”
Claim · model-written summary
The relationship between photosynthesis and total N did not differ between CO2 treatments.
- Taxon
- RiceOryza sativat0
- Treatment
- two CO2 treatmentse0
- Outcome
- relationship between photosynthesis and total Ne0
- Direction
- no differencese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“no differences between the two CO2 treatments in the relationship between photosynthesis and total N”
t0“Rice Leaves”
Claim · model-written summary
The relationship between Rubisco and chlorophyll and total N did not differ between CO2 treatments.
- Taxon
- RiceOryza sativat0
- Treatment
- two CO2 treatmentse0
- Outcome
- relationship between Rubisco and Chl and total Ne0
- Direction
- no differencese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“no differences between the two CO2 treatments in the relationship between photosynthesis and total N or in the relationship between Rubisco and Chl and total N”
t0“Rice Leaves”
Claim · model-written summary
Rubisco decreased relative to cytochrome f in plants grown at 100 Pa CO2.
- Taxon
- RiceOryza sativat0
- Treatment
- 100 Pa CO2e0
- Outcome
- Rubiscoe0
- Direction
- decreasee0
- Comparator
- cytochrome fe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a relative decrease in Rubisco to cytochrome f or sucrose phosphate synthase was found in the plants grown in 100 Pa CO2”
t0“Rice Leaves”
Claim · model-written summary
Rubisco decreased relative to sucrose phosphate synthase in plants grown at 100 Pa CO2.
- Taxon
- RiceOryza sativat0
- Treatment
- 100 Pa CO2e0
- Outcome
- Rubiscoe0
- Direction
- decreasee0
- Comparator
- sucrose phosphate synthasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a relative decrease in Rubisco to cytochrome f or sucrose phosphate synthase was found in the plants grown in 100 Pa CO2”
t0“Rice Leaves”
Claim · model-written summary
Growth CO2 levels did not affect Rubisco activation state.
- Taxon
- RiceOryza sativat0
- Treatment
- growth CO2 levelse0
- Outcome
- activation state of Rubiscoe0
- Direction
- unaffectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The activation state of Rubisco was also unaffected by growth CO2 levels.”
t0“Rice Leaves”
Claim · model-written summary
The authors attributed lower photosynthetic capacity at 100 Pa CO2 to lower absolute leaf N.
- Taxon
- RiceOryza sativat0
- Treatment
- 100 Pa CO2e0
- Outcome
- decreases in the photosynthetic capacitye0
- Qualifier
- decrease in the absolute amount of leaf Ne0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“decreases in the photosynthetic capacity of the plants grown in 100 Pa CO2 could be simply accounted for by a decrease in the absolute amount of leaf N”
t0“Rice Leaves”
The same questions in other papers
co2 · physiology: photosynthesis · Oryza sativa (rice)Results differ
16 papers in the same direction as this paper · 45 in the opposite direction
- positive
- positive
- positive
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.