Abstract
The effects of doubled CO2 concentration on non-structural carbohydrate metabolism of cucumber (Cucumis sativus L. cv. 'Jinyou No.1') seedlings under drought stress were investigated. Split plot design was deployed, with two levels of CO2 concentrations (ambient CO2 concentration, 380 µmol . mol-1, and doubled CO2 concentration, 760±20 µmol . mol-1) in the main plots, and three levels of water treatments (control, moderate drought stress, and severe drought stress) simulated by PEG 6000 in the split-plots. The results showed that non-structural carbohydrates of cucumber leaves, including glucose, fructose, sucrose, and stachyose, increased with the doubling of CO2 concentration, which resulted in the decreased osmotic potential, improving the drought stress in cucumber seedlings. During the drought stress, sucrose synthase, soluble acid invertase and al- kaline invertase started with an increase, and followed with a decline in the leaves. In the root system, however, soluble acid invertase and alkaline invertase increased gradually throughout the whole process, whereas sucrose phosphate synthase firstly increased and then decreased. The treatment of doubled CO2 enhanced the activity of sucrose synthase, but decreased the activity of sucrose phosphate synthase. The synergistic action of the two enzymes and invertase accelerated the decomposition of sucrose and inhibited the synthesis of sucrose, leading to the accumulation of hexose, which lowered the cellular osmotic potential and enhanced the water uptake capacity. In conclusion, doubled CO2 concentration could alleviate the adverse effects of drought stress and improve the drought tolerance of cucumber seedlings. Such mitigating effect on cucumber was more significant under severe drought stress.
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Claims 8
Claim · model-written summary
Doubled CO2 increased leaf glucose, fructose, sucrose, and stachyose.
- Taxon
- cucumber
Cucumis sativuse0 - Organ / stage
- leavese0
- Treatment
- doubling of CO2 concentratione0
- Outcome
- glucose, fructose, sucrose, and stachyosee0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“non-structural carbohydrates of cucumber leaves, including glucose, fructose, sucrose, and stachyose, increased with the doubling of CO2 concentration”
Claim · model-written summary
In leaves under drought, sucrose synthase and acid and alkaline invertase first increased then declined.
- Taxon
- cucumberCucumis sativuse1
- Organ / stage
- leavese0
- Outcome
- sucrose synthase, soluble acid invertase and al- kaline invertasee0
- Direction
- increasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“During the drought stress, sucrose synthase, soluble acid invertase and al- kaline invertase started with an increase, and followed with a decline in the leaves.”
e1“drought stress in cucumber seedlings”
Claim · model-written summary
In roots under drought, soluble acid and alkaline invertase increased throughout.
- Taxon
- cucumberCucumis sativuse1
- Organ / stage
- root systeme0
- Outcome
- soluble acid invertase and alkaline invertasee0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In the root system, however, soluble acid invertase and alkaline invertase increased gradually throughout the whole process”
e1“drought stress in cucumber seedlings”
Claim · model-written summary
Root sucrose phosphate synthase first increased then decreased.
- Taxon
- cucumberCucumis sativuse1
- Outcome
- sucrose phosphate synthasee0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“sucrose phosphate synthase firstly increased and then decreased”
e1“drought stress in cucumber seedlings”
Claim · model-written summary
Doubled CO2 enhanced sucrose synthase activity.
- Taxon
- cucumberCucumis sativuse1
- Treatment
- doubled CO2e0
- Gene
- sucrose synthasee0
- Outcome
- activity of sucrose synthasee0
- Direction
- enhancede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The treatment of doubled CO2 enhanced the activity of sucrose synthase”
e1“drought stress in cucumber seedlings”
Claim · model-written summary
Doubled CO2 decreased sucrose phosphate synthase activity.
- Taxon
- cucumberCucumis sativuse1
- Treatment
- doubled CO2e0
- Gene
- sucrose phosphate synthasee0
- Outcome
- activity of sucrose phosphate synthasee0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The treatment of doubled CO2 enhanced the activity of sucrose synthase, but decreased the activity of sucrose phosphate synthase.”
e1“drought stress in cucumber seedlings”
Claim · model-written summary
Authors attributed hexose accumulation and lower osmotic potential to coordinated enzyme activity.
- Taxon
- cucumberCucumis sativuse1
- Outcome
- accumulation of hexosee0
- Qualifier
- synergistic action of the two enzymes and invertasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The synergistic action of the two enzymes and invertase accelerated the decomposition of sucrose and inhibited the synthesis of sucrose, leading to the accumulation of hexose, which lowered the cellular osmotic potential and enhanced the water uptake capacity.”
e1“drought stress in cucumber seedlings”
Claim · model-written summary
Doubled CO2 alleviated drought stress, especially under severe drought.
- Taxon
- cucumberCucumis sativuse0
- Treatment
- doubled CO2 concentratione0
- Outcome
- drought tolerancee0
- Direction
- improvee0
- Qualifier
- under severe drought stresse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“doubled CO2 concentration could alleviate the adverse effects of drought stress and improve the drought tolerance of cucumber seedlings. Such mitigating effect on cucumber was more significant under severe drought stress.”
The same questions in other papers
co2 · molecular: metabolites · Cucumis sativus (cucumber)Positive and negative results
10 papers in the same direction as this paper · 5 in the opposite direction
- negative
- no effect
- negative
12 papers more in this group
See all 16 papers →co2 · tolerance: abiotic · Cucumis sativus (cucumber)Results agree
2 papers in the same direction as this paper
- positive
- positive
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.