Abstract
Cucumis sativus L. seedlings were pretreated 1 h with 10 μM paraquat (PQ) and then were subjected to normal (25/18 °C) or elevated (42/38 °C) temperature to investigate whether PQ can protect plants against heat stress. Heat stress inhibited fresh and dry masses of the second leaf, root dry mass and shoot fresh mass. In leaves, the stress disintegrated membranes of 84.97 % chloroplasts and elevated contents of malondialdehyde, superoxide radical and hydrogen peroxide. In contrast, PQ pretreatment altered antioxidant activities in leaves, even after PQ was rinsed off before seedlings were exposed to different temperatures. Under heat stress, PQ pretreatment improved plant growth, decreased percentage of abnormal chloroplasts (53.03 %) and reduced contents of malonaldehyde, superoxide radical and hydrogen peroxide due to increased activities of antioxidant enzymes such as superoxide dismutase, catalase, guaiacol peroxidase, glutathione peroxidase, ascorbate peroxidase, monodehydroascorbate reductase, dehydroascorbate reductase and glutathione reductase.
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Claims 8
Claim · model-written summary
Heat stress inhibited cucumber leaf, root and shoot mass.
- Taxon
- Cucumis sativus L.
Cucumis sativuse0 - Treatment
- elevated (42/38 °C) temperaturee0
- Outcome
- fresh and dry masses of the second leaf, root dry mass and shoot fresh masse1
- Direction
- inhibitede1
- Comparator
- normal (25/18 °C)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cucumis sativus L. seedlings were pretreated 1 h with 10 μM paraquat (PQ) and then were subjected to normal (25/18 °C) or elevated (42/38 °C) temperature to investigate whether PQ can protect plants against heat stress.”
e1“Heat stress inhibited fresh and dry masses of the second leaf, root dry mass and shoot fresh mass.”
Claim · model-written summary
Heat stress disintegrated membranes in 84.97% of cucumber chloroplasts.
- Taxon
- cucumberCucumis sativust0
- Treatment
- elevated (42/38 °C) temperaturee0
- Outcome
- disintegrated membranes of 84.97 % chloroplastse1
- Direction
- disintegratede1
- Value
- 84.97 %e1
- Comparator
- normal (25/18 °C)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cucumber leaves”
e0“normal (25/18 °C) or elevated (42/38 °C) temperature”
e1“the stress disintegrated membranes of 84.97 % chloroplasts”
Claim · model-written summary
Heat stress elevated malondialdehyde, superoxide and hydrogen peroxide in leaves.
- Taxon
- cucumberCucumis sativust0
- Treatment
- elevated (42/38 °C) temperaturee0
- Outcome
- contents of malondialdehyde, superoxide radical and hydrogen peroxidee1
- Direction
- elevatede1
- Comparator
- normal (25/18 °C)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cucumber leaves”
e0“normal (25/18 °C) or elevated (42/38 °C) temperature”
e1“elevated contents of malondialdehyde, superoxide radical and hydrogen peroxide.”
Claim · model-written summary
Paraquat pretreatment altered antioxidant activities after rinsing, across temperatures.
- Taxon
- cucumberCucumis sativust0
- Treatment
- PQ pretreatmente0
- Outcome
- antioxidant activities in leavese0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cucumber leaves”
e0“PQ pretreatment altered antioxidant activities in leaves, even after PQ was rinsed off before seedlings were exposed to different temperatures.”
Claim · model-written summary
Under heat stress, paraquat pretreatment improved cucumber growth.
- Taxon
- cucumberCucumis sativust0
- Treatment
- PQ pretreatmente0
- Outcome
- plant growthe0
- Direction
- improvede0
- Qualifier
- Under heat stresse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cucumber leaves”
e0“Under heat stress, PQ pretreatment improved plant growth, decreased percentage of abnormal chloroplasts (53.03 %) and reduced contents of malonaldehyde, superoxide radical and hydrogen peroxide due to increased activities of antioxidant enzymes such as superoxide dismutase, catalase, guaiacol peroxidase, glutathione peroxidase, ascorbate peroxidase, monodehydroascorbate reductase, dehydroascorbate reductase and glutathione reductase.”
Claim · model-written summary
Under heat stress, paraquat pretreatment decreased abnormal cucumber chloroplasts to 53.03%.
- Taxon
- cucumberCucumis sativust0
- Treatment
- PQ pretreatmente0
- Outcome
- percentage of abnormal chloroplastse0
- Direction
- decreasede0
- Value
- 53.03 %e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cucumber leaves”
e0“Under heat stress, PQ pretreatment improved plant growth, decreased percentage of abnormal chloroplasts (53.03 %) and reduced contents of malonaldehyde, superoxide radical and hydrogen peroxide due to increased activities of antioxidant enzymes such as superoxide dismutase, catalase, guaiacol peroxidase, glutathione peroxidase, ascorbate peroxidase, monodehydroascorbate reductase, dehydroascorbate reductase and glutathione reductase.”
Claim · model-written summary
Under heat stress, paraquat pretreatment reduced oxidative compound contents.
- Taxon
- cucumberCucumis sativust0
- Treatment
- PQ pretreatmente0
- Outcome
- contents of malonaldehyde, superoxide radical and hydrogen peroxidee0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cucumber leaves”
e0“Under heat stress, PQ pretreatment improved plant growth, decreased percentage of abnormal chloroplasts (53.03 %) and reduced contents of malonaldehyde, superoxide radical and hydrogen peroxide due to increased activities of antioxidant enzymes such as superoxide dismutase, catalase, guaiacol peroxidase, glutathione peroxidase, ascorbate peroxidase, monodehydroascorbate reductase, dehydroascorbate reductase and glutathione reductase.”
Claim · model-written summary
The authors attributed reduced oxidative compounds to increased antioxidant enzyme activities.
- Taxon
- cucumberCucumis sativust0
- Gene
- antioxidant enzymese0
- Outcome
- reduced contents of malonaldehyde, superoxide radical and hydrogen peroxidee0
- Qualifier
- increased activitiese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cucumber leaves”
e0“reduced contents of malonaldehyde, superoxide radical and hydrogen peroxide due to increased activities of antioxidant enzymes such as superoxide dismutase, catalase, guaiacol peroxidase, glutathione peroxidase, ascorbate peroxidase, monodehydroascorbate reductase, dehydroascorbate reductase and glutathione reductase.”
The same questions in other papers
paraquat · growth · Cucumis sativus (cucumber)Results agree
1 paper in the same direction as this paper
- positive
paraquat · physiology: oxidative · 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.