Abstract
The global atmospheric CO2 concentration ([CO2]) has sharply risen due to human activities, and it has reached 410 μmol mol–1 at present. It is expected that the atmospheric [CO2] will reach approximately 550 μmol mol–1 by the middle of the 21st century. The increase in the [CO2] has a certain “fertilizing effect” on plants. On the other hand, climate warming and precipitation reductions caused by the greenhouse effect will lead to expanding arid areas and aggravated drought, which will restrict plant growth and yield. Therefore, studying the potential physiological mechanism and synergistic effects of an enriched [CO2] combined with environmental stress factors has great significance for understanding plant physiological and ecological processes. We investigated the effects of an enriched [CO2] (800 ± 40 μmol mol–1) on the antioxidant capacity and sucrose metabolism of cucumber (Cucumis sativus L. cv. ‘Jinyou No. 35’) seedlings under drought stress (5 or 10% PEG 6000 in nutrient solutions). The results showed that (1) the activities of superoxide dismutase (SOD), peroxidase (POD), and catalase (CAT) were enhanced by the enriched [CO2]; the contents of malondialdehyde (MDA) and hydrogen peroxide (H2O2), as well as the superoxide anion radical ( $${\text{O}}_{2}^{ - }$$ ) production rate, in the leaves were reduced; and lipid peroxidation and cytomembrane permeability decreased under drought stress. (2) The enriched [CO2] significantly improved sucrose synthase (SS) activity but decreased sucrose phosphate synthase (SPS) activity under drought stress, resulting in the accumulation of hexose through accelerated sucrose decomposition and inhibited synthesis. Thus, the osmotic potential of cells was reduced, and the water absorption capacity was enhanced. In conclusion, the enriched [CO2] relieved the detrimental effects of drought stress and enhanced the resistance of cucumber plant growth during drought stress through enhanced cellular membrane stability and antioxidative enzyme activities, thus promoting the accumulation of soluble sugar, while the MDA content and accumulation of reactive oxygen species (ROS) were reduced.
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Claims 7
Claim · model-written summary
Enriched CO2 enhanced SOD, POD and CAT activities under drought.
- Taxon
- cucumber
Cucumis sativuse0 - Treatment
- enriched [CO2]e1
- Outcome
- activities of superoxide dismutase (SOD), peroxidase (POD), and catalase (CAT)e1
- Direction
- enhancede1
- Qualifier
- under drought stresse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cucumber (Cucumis sativus L. cv. ‘Jinyou No. 35’) seedlings under drought stress (5 or 10% PEG 6000 in nutrient solutions).”
e1“the activities of superoxide dismutase (SOD), peroxidase (POD), and catalase (CAT) were enhanced by the enriched [CO2]”
Claim · model-written summary
Enriched CO2 reduced leaf MDA and H2O2 contents and superoxide production under drought.
- Taxon
- cucumberCucumis sativuse0
- Treatment
- enriched [CO2]e2
- Outcome
- contents of malondialdehyde (MDA) and hydrogen peroxide (H2O2), as well as the superoxide anion radical ( $${\text{O}}_{2}^{ - }$$ ) production ratee1
- Direction
- reducede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cucumber (Cucumis sativus L. cv. ‘Jinyou No. 35’) seedlings under drought stress”
e1“the contents of malondialdehyde (MDA) and hydrogen peroxide (H2O2), as well as the superoxide anion radical ( $${\text{O}}_{2}^{ - }$$ ) production rate, in the leaves were reduced”
e2“The enriched [CO2]”
Claim · model-written summary
Lipid peroxidation and membrane permeability decreased under drought with enriched CO2.
- Taxon
- cucumberCucumis sativuse0
- Treatment
- enriched [CO2]e2
- Outcome
- lipid peroxidation and cytomembrane permeabilitye1
- Direction
- decreasede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cucumber (Cucumis sativus L. cv. ‘Jinyou No. 35’)”
e1“lipid peroxidation and cytomembrane permeability decreased under drought stress.”
e2“The enriched [CO2]”
Claim · model-written summary
Enriched CO2 significantly improved sucrose synthase activity under drought.
- Taxon
- cucumberCucumis sativuse0
- Treatment
- enriched [CO2]e1
- Outcome
- sucrose synthase (SS) activitye1
- Direction
- improvede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cucumber (Cucumis sativus L. cv. ‘Jinyou No. 35’)”
e1“The enriched [CO2] significantly improved sucrose synthase (SS) activity but decreased sucrose phosphate synthase (SPS) activity under drought stress”
Claim · model-written summary
Enriched CO2 decreased sucrose phosphate synthase activity under drought.
- Taxon
- cucumberCucumis sativuse0
- Treatment
- enriched [CO2]e1
- Outcome
- sucrose phosphate synthase (SPS) activitye1
- Direction
- decreasede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cucumber (Cucumis sativus L. cv. ‘Jinyou No. 35’)”
e1“The enriched [CO2] significantly improved sucrose synthase (SS) activity but decreased sucrose phosphate synthase (SPS) activity under drought stress”
Claim · model-written summary
Enriched CO2 led to hexose accumulation through changed sucrose metabolism.
- Taxon
- cucumberCucumis sativuse0
- Outcome
- accumulation of hexosee1
- Direction
- accumulatione1
- Qualifier
- accelerated sucrose decomposition and inhibited synthesise1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cucumber (Cucumis sativus L. cv. ‘Jinyou No. 35’)”
e1“resulting in the accumulation of hexose through accelerated sucrose decomposition and inhibited synthesis.”
Claim · model-written summary
Cell osmotic potential fell and water absorption capacity rose.
- Taxon
- cucumberCucumis sativuse0
- Outcome
- osmotic potential of cellse1
- Direction
- reducede1
- Qualifier
- water absorption capacity was enhancede1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cucumber (Cucumis sativus L. cv. ‘Jinyou No. 35’)”
e1“Thus, the osmotic potential of cells was reduced, and the water absorption capacity was enhanced.”
The same questions in other papers
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3 papers in the same direction as this paper
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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.