Abstract
The effect of short-term drought stress on the water content, antioxidant system and photosynthetic characteristics was investigated using cucumber ( Cucumis sativus L.) seedlings. The results indicated that polyethylene glycol induced water stress reduced water content in shoots of cucumber seedling after treatment of 36 hours, and caused obvious reductions in net photosynthetic rate, stomatal conductance, intercellular CO 2 concentration and transpiration of leaves. In addition, water stress significantly reduced the photosynthetic pigment content and inhibited photochemical activity, including actual photochemical efficiency, maximal quantum yield of photosystem II photochemistry and coefficient for photochemical quenching. Meanwhile non-photochemical quenching increased. As responses to drought stress, significant increases in electrolyte leakage, malondialdehyde, superoxide anion and hydrogen peroxide levels were detected in leaves. The superoxide dismutases, catalase, glutathione reductase and dehydroascorbate reductase activities, protein, ascorbate and glutathione content, all decreased and peroxidases activity increased, while ascorbate peroxidase and monodehydroascorbate reductase activities exhibited different trend under different degree of water stress. Therefore, it can be concluded that water stress strongly disrupted the normal metabolism of leaves and restrained water absorption.
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Claims 13
Claim · model-written summary
Water stress reduced shoot water content after 36 hours.
- Taxon
- cucumber
Cucumis sativuse0 - Treatment
- polyethylene glycol induced water stresse0
- Outcome
- water content in shootse0
- Direction
- reducede0
- Qualifier
- after treatment of 36 hourse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“polyethylene glycol induced water stress reduced water content in shoots of cucumber seedling after treatment of 36 hours”
Claim · model-written summary
Water stress reduced four gas exchange measures.
- Taxon
- cucumberCucumis sativust0
- Treatment
- drought stresst0
- Outcome
- net photosynthetic rate, stomatal conductance, intercellular CO 2 concentratione0
- Direction
- reductionse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“caused obvious reductions in net photosynthetic rate, stomatal conductance, intercellular CO 2 concentration and transpiration of leaves.”
t0“drought stress in cucumber”
Claim · model-written summary
Water stress reduced transpiration.
- Taxon
- cucumberCucumis sativust0
- Treatment
- drought stresst0
- Outcome
- transpiration of leavese0
- Direction
- reductionse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“caused obvious reductions in net photosynthetic rate, stomatal conductance, intercellular CO 2 concentration and transpiration of leaves.”
t0“drought stress in cucumber”
Claim · model-written summary
Water stress significantly reduced photosynthetic pigment content.
- Taxon
- cucumberCucumis sativust0
- Treatment
- water stresse0
- Outcome
- photosynthetic pigment contente0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“water stress significantly reduced the photosynthetic pigment content”
t0“cucumber”
Claim · model-written summary
Water stress inhibited three photochemical activity measures.
- Taxon
- cucumberCucumis sativust0
- Treatment
- drought stresst0
- Outcome
- actual photochemical efficiency, maximal quantum yield of photosystem II photochemistry and coefficient for photochemical quenchinge0
- Direction
- inhibitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“inhibited photochemical activity, including actual photochemical efficiency, maximal quantum yield of photosystem II photochemistry and coefficient for photochemical quenching.”
t0“PEG-induced drought stress in cucumber seedling leaves”
Claim · model-written summary
Non-photochemical quenching increased.
- Taxon
- cucumberCucumis sativust0
- Treatment
- drought stresst0
- Outcome
- non-photochemical quenchinge0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Meanwhile non-photochemical quenching increased.”
t0“PEG-induced drought stress in cucumber seedling leaves”
Claim · model-written summary
Electrolyte leakage, malondialdehyde and superoxide anion rose.
- Taxon
- cucumberCucumis sativust0
- Treatment
- drought stresst0
- Outcome
- electrolyte leakage, malondialdehyde, superoxide anione0
- Direction
- increasese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“significant increases in electrolyte leakage, malondialdehyde, superoxide anion and hydrogen peroxide levels were detected in leaves.”
t0“drought stress in cucumber”
Claim · model-written summary
Hydrogen peroxide levels increased.
- Taxon
- cucumberCucumis sativust0
- Treatment
- drought stresst0
- Outcome
- hydrogen peroxide levelse0
- Direction
- increasese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“significant increases in electrolyte leakage, malondialdehyde, superoxide anion and hydrogen peroxide levels were detected in leaves.”
t0“drought stress in cucumber”
Claim · model-written summary
Four antioxidant enzyme activities decreased.
- Taxon
- cucumberCucumis sativust0
- Treatment
- drought stresst0
- Outcome
- superoxide dismutases, catalase, glutathione reductasee0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The superoxide dismutases, catalase, glutathione reductase and dehydroascorbate reductase activities, protein, ascorbate and glutathione content, all decreased”
t0“PEG-induced drought stress in cucumber seedling leaves”
Claim · model-written summary
Dehydroascorbate reductase activity decreased.
- Taxon
- cucumberCucumis sativust0
- Treatment
- drought stresst0
- Outcome
- dehydroascorbate reductase activitiese0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The superoxide dismutases, catalase, glutathione reductase and dehydroascorbate reductase activities, protein, ascorbate and glutathione content, all decreased”
t0“PEG-induced drought stress in cucumber seedling leaves”
Claim · model-written summary
Protein, ascorbate and glutathione content decreased.
- Taxon
- cucumberCucumis sativust0
- Treatment
- drought stresst0
- Outcome
- protein, ascorbate and glutathione contente0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“protein, ascorbate and glutathione content, all decreased”
t0“PEG-induced drought stress in cucumber seedling leaves”
Claim · model-written summary
Peroxidase activity increased.
- Taxon
- cucumberCucumis sativust0
- Treatment
- drought stresst0
- Outcome
- peroxidases activitye0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“peroxidases activity increased”
t0“PEG-induced drought stress in cucumber seedling leaves”
Claim · model-written summary
Ascorbate peroxidase and monodehydroascorbate reductase showed varying trends by stress severity.
- Taxon
- cucumberCucumis sativust0
- Treatment
- water stresse0
- Outcome
- ascorbate peroxidase and monodehydroascorbate reductase activitiese0
- Qualifier
- under different degree of water stresse0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“ascorbate peroxidase and monodehydroascorbate reductase activities exhibited different trend under different degree of water stress.”
t0“cucumber”
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See all 6 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.