Abstract
Drought stress is one of the main environmental factors limiting plant growth and productivity of many crops. Elevated carbon dioxide concentration (eCO2) can ameliorate, mitigate, or compensate for the negative impact of drought on plant growth and enable plants to remain turgid and functional for a longer period. In order to investigate the combined effects of eCO2 and drought stress on photosynthetic performance and leaf structures, we analyzed photosynthetic characteristics and structure and ultrastructure of cucumber leaves. The decline in net photosynthetic rate under moderate drought stress occurred due to stomatal limitation alone, while under severe drought stress, it was the result of stomatal and nonstomatal limitations. Conversely, eCO2 improved photosynthetic performance under moderate drought stress, increased the lengths of the palisade cells and the number of chloroplasts per palisade cell under severe drought stress, and significantly increased the grana thickness under moderate drought stress. Additionally, eCO2 significantly decreased stomatal density, stomatal widths and stomatal aperture on the abaxial surface of leaves under moderate drought stress. In conclusion, eCO2 can alleviate the negative effects of drought stress by improving the drought resistance of cucumber seedlings through stomatal modifications and leaf structure.
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Claims 7
Claim · model-written summary
The decline in net photosynthetic rate under moderate drought stress in cucumber was due to stomatal limitation alone.
- Taxon
- cucumber
Cucumis sativust0 - Treatment
- moderate drought stresse1
- Outcome
- net photosynthetic ratee1
- Qualifier
- stomatal limitation alonee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cucumber (Cucumis sativus L.) seedlings”
e1“The decline in net photosynthetic rate under moderate drought stress occurred due to stomatal limitation alone”
Claim · model-written summary
Under severe drought stress, the decline in net photosynthetic rate in cucumber resulted from stomatal and nonstomatal limitations.
- Taxon
- cucumberCucumis sativust0
- Treatment
- severe drought stresse2
- Outcome
- net photosynthetic ratee1
- Qualifier
- stomatal and nonstomatal limitationse2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cucumber (Cucumis sativus L.) seedlings”
e1“The decline in net photosynthetic rate under moderate drought stress occurred due to stomatal limitation alone”
e2“while under severe drought stress, it was the result of stomatal and nonstomatal limitations”
Claim · model-written summary
Elevated CO2 improved photosynthetic performance of cucumber under moderate drought stress.
- Taxon
- cucumberCucumis sativust0
- Treatment
- eCO2e3
- Outcome
- photosynthetic performancee3
- Direction
- improvede3
- Qualifier
- under moderate drought stresse3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cucumber (Cucumis sativus L.) seedlings”
e3“Conversely, eCO2 improved photosynthetic performance under moderate drought stress”
Claim · model-written summary
Elevated CO2 increased palisade cell length and the number of chloroplasts per palisade cell in cucumber under severe drought stress.
- Taxon
- cucumberCucumis sativust0
- Treatment
- eCO2e3
- Outcome
- lengths of the palisade cells and the number of chloroplasts per palisade celle4
- Direction
- increasede4
- Qualifier
- under severe drought stresse4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cucumber (Cucumis sativus L.) seedlings”
e3“Conversely, eCO2 improved photosynthetic performance under moderate drought stress”
e4“increased the lengths of the palisade cells and the number of chloroplasts per palisade cell under severe drought stress”
Claim · model-written summary
Elevated CO2 significantly increased grana thickness in cucumber under moderate drought stress.
- Taxon
- cucumberCucumis sativust0
- Treatment
- eCO2e3
- Outcome
- grana thicknesse5
- Direction
- significantly increasede5
- Qualifier
- under moderate drought stresse5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cucumber (Cucumis sativus L.) seedlings”
e3“Conversely, eCO2 improved photosynthetic performance under moderate drought stress”
e5“significantly increased the grana thickness under moderate drought stress”
Claim · model-written summary
Elevated CO2 significantly decreased stomatal density, stomatal width and stomatal aperture on the abaxial leaf surface of cucumber under moderate drought stress.
- Taxon
- cucumberCucumis sativust0
- Treatment
- eCO2e6
- Outcome
- stomatal density, stomatal widths and stomatal aperturee6
- Direction
- significantly decreasede6
- Qualifier
- on the abaxial surface of leaves under moderate drought stresse6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cucumber (Cucumis sativus L.) seedlings”
e6“eCO2 significantly decreased stomatal density, stomatal widths and stomatal aperture on the abaxial surface of leaves under moderate drought stress”
Claim · model-written summary
Elevated CO2 alleviates drought stress in cucumber seedlings by improving drought resistance through stomatal modifications and leaf structure.
- Taxon
- cucumber seedlingsCucumis sativuse7
- Treatment
- eCO2e7
- Outcome
- drought resistancee7
- Qualifier
- through stomatal modifications and leaf structuree7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e7“In conclusion, eCO2 can alleviate the negative effects of drought stress by improving the drought resistance of cucumber seedlings through stomatal modifications and leaf structure”
The same questions in other papers
co2 · physiology: gas exchange · Cucumis sativus (cucumber)Positive and negative results
3 papers in the same direction as this paper · 2 in the opposite direction
- negative
- negative
- positive
2 papers more in this group
See all 6 papers →co2 · physiology: photosynthesis · Cucumis sativus (cucumber)Positive and negative results
19 papers in the same direction as this paper · 2 in the opposite direction
- positive
- positive
- positive
18 papers more in this group
See all 22 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.