Abstract
The effects of doubled CO 2 concentration (700 μmol/mol) on antioxidant enzymes and programmed cell death in wheat under osmotic stress were studied. The results are as follows: The activities of SOD, POX, and CAT in wheat leaves under doubled CO 2 were markedly higher than those of control while the increasing period and steady period were longer (Fig.1). The H 2O 2 content of the leaves growing under high CO 2 concentration was higher than the control and after PEG6000 treatment, the increase of MDA, electrolyte leakage and H 2O 2 increased slightly than in the control (Figs.2, 3). The DNA ladders were observed from three to five days after PEG treatment in control and from four to seven days in control (Fig.4). During the time when DNA ladders appeared, the activities of SOD, POX and CAT and the MDA and H 2O 2 contents were all nearly steady. The results indicated that programmed cell death was enhanced by active oxygen and alleviated by antioxidant enzymes and elevated CO 2 could enhance the functioning of the antioxidant system to increase the tolerance to osmotic stress.
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Claims 8
Claim · model-written summary
Doubled carbon dioxide markedly increased wheat leaf SOD, POX and CAT activities relative to control.
- Taxon
- wheat
Triticum aestivume0 - Organ / stage
- leavese0
- Treatment
- doubled CO 2e0
- Outcome
- activities of SOD, POX, and CATe0
- Direction
- highere0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The activities of SOD, POX, and CAT in wheat leaves under doubled CO 2 were markedly higher than those of control”
Claim · model-written summary
The increase and steady periods of wheat leaf antioxidant enzyme activities were longer under doubled carbon dioxide.
- Taxon
- WheatTriticum aestivumt0
- Treatment
- doubled CO 2e0
- Outcome
- increasing period and steady periode0
- Direction
- longere0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The activities of SOD, POX, and CAT in wheat leaves under doubled CO 2 were markedly higher than those of control while the increasing period and steady period were longer”
t0“Wheat Leaves Under Osmotic Stress”
Claim · model-written summary
High carbon dioxide increased wheat leaf hydrogen peroxide content relative to control.
- Taxon
- wheatTriticum aestivumt0
- Organ / stage
- leavese0
- Treatment
- high CO 2 concentratione0
- Outcome
- H 2O 2 contente0
- Direction
- highere0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The H 2O 2 content of the leaves growing under high CO 2 concentration was higher than the control”
t0“Wheat Leaves Under Osmotic Stress”
Claim · model-written summary
After PEG6000 treatment, wheat leaf MDA, electrolyte leakage and hydrogen peroxide rose only slightly relative to control.
- Taxon
- WheatTriticum aestivumt0
- Treatment
- PEG6000 treatmente0
- Outcome
- MDA, electrolyte leakage and H 2O 2e0
- Direction
- increased slightlye0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“after PEG6000 treatment, the increase of MDA, electrolyte leakage and H 2O 2 increased slightly than in the control”
t0“Wheat Leaves Under Osmotic Stress”
Claim · model-written summary
DNA ladders appeared three to five days after PEG treatment in control wheat.
- Taxon
- WheatTriticum aestivumt0
- Treatment
- PEG treatmente0
- Outcome
- DNA ladders were observede0
- Value
- three to five dayse0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The DNA ladders were observed from three to five days after PEG treatment in control”
t0“Wheat Leaves Under Osmotic Stress”
Claim · model-written summary
During DNA ladder appearance, wheat antioxidant enzyme activities and MDA and hydrogen peroxide contents were nearly steady.
- Taxon
- WheatTriticum aestivumt0
- Outcome
- activities of SOD, POX and CAT and the MDA and H 2O 2 contentse0
- Direction
- nearly steadye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“During the time when DNA ladders appeared, the activities of SOD, POX and CAT and the MDA and H 2O 2 contents were all nearly steady”
t0“Wheat Leaves Under Osmotic Stress”
Claim · model-written summary
The authors interpret active oxygen as enhancing programmed cell death and antioxidant enzymes as alleviating it.
- Taxon
- WheatTriticum aestivumt0
- Outcome
- programmed cell deathe0
- Qualifier
- active oxygen and alleviated by antioxidant enzymese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“programmed cell death was enhanced by active oxygen and alleviated by antioxidant enzymes”
t0“Wheat Leaves Under Osmotic Stress”
Claim · model-written summary
The authors conclude that elevated carbon dioxide strengthens wheat antioxidant function and tolerance to osmotic stress.
- Taxon
- WheatTriticum aestivumt0
- Treatment
- elevated CO 2e0
- Outcome
- tolerance to osmotic stresse0
- Direction
- increasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“elevated CO 2 could enhance the functioning of the antioxidant system to increase the tolerance to osmotic stress”
t0“Wheat Leaves Under Osmotic Stress”
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