Abstract
The changes in photosynthetic activity, as well as the activity of nitrogen-metabolism enzymes, the intensity of lipid peroxidation, and proline content were studied in Triticum aestivum L. plants after their incubation at a low CO2 concentration in a sealed chamber for 10 d. CO2 deficiency (-CO2) compared to normal CO2 concentration (control) led to a decrease in the rate of O2 gas exchange at the plateau of the light curve and quantum yield of photosynthesis. The maximum and effective quantum photochemical yields also decreased. CO2 deficiency reduced the activity of nitrate reductase, but increased the activities of nitrite reductase, glutamine synthetase, and glutamate dehydrogenase, and promoted proline accumulation. It is assumed that with a lack of CO2, an excess of nitrogen-containing compounds occurs, which must be removed from metabolic processes. Also, we suggest the partial storage of nitrogen in the form of nitrogen-containing compounds such as proline.
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Claims 8
Claim · model-written summary
Low CO2 decreased rate of O2 gas exchange.
- Taxon
- Triticum aestivum L.
Triticum aestivume1 - Treatment
- CO2 deficiency (-CO2)e0
- Outcome
- rate of O2 gas exchangee0
- Direction
- decreasee0
- Comparator
- normal CO2 concentration (control)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“CO2 deficiency (-CO2) compared to normal CO2 concentration (control) led to a decrease in the rate of O2 gas exchange at the plateau of the light curve and quantum yield of photosynthesis”
e1“Triticum aestivum L. plants”
Claim · model-written summary
Low CO2 decreased quantum yield of photosynthesis.
- Taxon
- Triticum aestivum L.Triticum aestivume1
- Treatment
- CO2 deficiency (-CO2)e0
- Outcome
- quantum yield of photosynthesise0
- Direction
- decreasee0
- Comparator
- normal CO2 concentration (control)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“CO2 deficiency (-CO2) compared to normal CO2 concentration (control) led to a decrease in the rate of O2 gas exchange at the plateau of the light curve and quantum yield of photosynthesis”
e1“Triticum aestivum L. plants”
Claim · model-written summary
Maximum and effective photochemical yields decreased.
- Taxon
- Triticum aestivum L.Triticum aestivume2
- Treatment
- CO2 deficiencye1
- Outcome
- maximum and effective quantum photochemical yieldse0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The maximum and effective quantum photochemical yields also decreased”
e1“CO2 deficiency (-CO2) compared to normal CO2 concentration (control) led to a decrease in the rate of O2 gas exchange at the plateau of the light curve and quantum yield of photosynthesis”
e2“Triticum aestivum L. plants”
Claim · model-written summary
CO2 deficiency reduced nitrate reductase activity.
- Taxon
- Triticum aestivum L.Triticum aestivume1
- Treatment
- CO2 deficiencye0
- Gene
- nitrate reductasee0
- Outcome
- activity of nitrate reductasee0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“CO2 deficiency reduced the activity of nitrate reductase”
e1“Triticum aestivum L. plants”
Claim · model-written summary
CO2 deficiency increased nitrite reductase, glutamine synthetase and glutamate dehydrogenase activities.
- Taxon
- Triticum aestivum L.Triticum aestivume2
- Treatment
- CO2 deficiencye1
- Outcome
- activities of nitrite reductase, glutamine synthetase, and glutamate dehydrogenasee0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increased the activities of nitrite reductase, glutamine synthetase, and glutamate dehydrogenase”
e1“CO2 deficiency (-CO2) compared to normal CO2 concentration (control) led to a decrease in the rate of O2 gas exchange at the plateau of the light curve and quantum yield of photosynthesis”
e2“Triticum aestivum L. plants”
Claim · model-written summary
CO2 deficiency promoted proline accumulation.
- Taxon
- Triticum aestivum L.Triticum aestivume2
- Treatment
- CO2 deficiencye1
- Outcome
- proline accumulatione0
- Direction
- promotede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“promoted proline accumulation”
e1“CO2 deficiency (-CO2) compared to normal CO2 concentration (control) led to a decrease in the rate of O2 gas exchange at the plateau of the light curve and quantum yield of photosynthesis”
e2“Triticum aestivum L. plants”
Claim · model-written summary
Authors hypothesize excess nitrogen compounds under CO2 deficiency.
- Taxon
- Triticum aestivum L.Triticum aestivume1
- Outcome
- excess of nitrogen-containing compoundse0
- Qualifier
- with a lack of CO2e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“with a lack of CO2, an excess of nitrogen-containing compounds occurs, which must be removed from metabolic processes”
e1“Triticum aestivum L. plants”
Claim · model-written summary
Authors suggest partial nitrogen storage as proline.
- Taxon
- Triticum aestivum L.Triticum aestivume1
- Outcome
- partial storage of nitrogene0
- Qualifier
- in the form of nitrogen-containing compounds such as prolinee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“partial storage of nitrogen in the form of nitrogen-containing compounds such as proline”
e1“Triticum aestivum L. plants”
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See all 97 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.