Abstract
Taking cucumber cultivar 'Jinchun 4' as test material, and by the method of foliar spraying, this paper studied the effects of exogenous melatonin (MT) on the ascorbic acid (AsA) metabolism system in cucumber seedlings under high temperature stress. Under the stress of high temperature, the leaf hydrogen peroxide (H2O2) and malondialdehyde (MDA) contents of the cucumber seedlings increased obviously, ascorbic acid (AsA) and glutathione (GSH) contents had a persistent decrease while dehydroascorbate (DHA) and oxidized-glutathione (GSSG) contents had a gradual increase, and AsA/DHA and GSH/GSSG decreased greatly. The activities of ascorbate peroxidase (APx), monodehydroascorbate reductase (MDHAR), dehydroascorbate reductase (DHAR), and glutathione reductase (GR) in the seedling leaves under high temperature stress increased markedly, with the maximum after 12 h stress. Foliar spraying MT could effectively restrain the accumulation of H2O2 and MDA in seedling leaves, increase the leaf AsA and GSH contents and the activities of ascorbic acid metabolizing enzymes APx, MDHAR, GR and DHAR, and accordingly, enhance the H2O2-scavenging ability, inhibit the production of active O2, maintain the stability of cell membrane, reduce the damage of high temperature to the plants, and improve the ability of cucumber seedlings against high temperature stress.
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Claims 15
Claim · model-written summary
High-temperature stress increased leaf H2O2 and MDA contents in cucumber seedlings.
- Taxon
- cucumber
Cucumis sativuse0 - Organ / stage
- leafe1
- Treatment
- stress of high temperaturee1
- Outcome
- hydrogen peroxide (H2O2) and malondialdehyde (MDA) contentse1
- Direction
- increasede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Taking cucumber cultivar 'Jinchun 4' as test material”
e1“Under the stress of high temperature, the leaf hydrogen peroxide (H2O2) and malondialdehyde (MDA) contents of the cucumber seedlings increased obviously”
Claim · model-written summary
High-temperature stress decreased leaf AsA and GSH contents persistently.
- Taxon
- cucumberCucumis sativuse0
- Treatment
- stress of high temperaturee1
- Outcome
- ascorbic acid (AsA) and glutathione (GSH) contentse2
- Direction
- decreasee2
- Qualifier
- persistente2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Taking cucumber cultivar 'Jinchun 4' as test material”
e1“Under the stress of high temperature, the leaf hydrogen peroxide (H2O2) and malondialdehyde (MDA) contents of the cucumber seedlings increased obviously”
e2“ascorbic acid (AsA) and glutathione (GSH) contents had a persistent decrease”
Claim · model-written summary
High-temperature stress increased DHA and GSSG contents gradually.
- Taxon
- cucumberCucumis sativuse0
- Treatment
- stress of high temperaturee1
- Outcome
- dehydroascorbate (DHA) and oxidized-glutathione (GSSG) contentse3
- Direction
- increasee3
- Qualifier
- graduale3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Taking cucumber cultivar 'Jinchun 4' as test material”
e1“Under the stress of high temperature, the leaf hydrogen peroxide (H2O2) and malondialdehyde (MDA) contents of the cucumber seedlings increased obviously”
e3“dehydroascorbate (DHA) and oxidized-glutathione (GSSG) contents had a gradual increase”
Claim · model-written summary
High-temperature stress decreased the AsA/DHA and GSH/GSSG ratios greatly.
- Taxon
- cucumberCucumis sativuse0
- Treatment
- stress of high temperaturee1
- Outcome
- AsA/DHA and GSH/GSSGe4
- Direction
- decreasede4
- Qualifier
- greatlye4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Taking cucumber cultivar 'Jinchun 4' as test material”
e1“Under the stress of high temperature, the leaf hydrogen peroxide (H2O2) and malondialdehyde (MDA) contents of the cucumber seedlings increased obviously”
e4“AsA/DHA and GSH/GSSG decreased greatly”
Claim · model-written summary
High-temperature stress increased the activities of APx, MDHAR and DHAR in seedling leaves, with the maximum after 12 h of stress.
- Taxon
- cucumberCucumis sativuse0
- Organ / stage
- seedling leavese5
- Treatment
- high temperature stresse5
- Gene
- ascorbate peroxidase (APx), monodehydroascorbate reductase (MDHAR), dehydroascorbate reductase (DHAR)e5
- Outcome
- activities of ascorbate peroxidase (APx), monodehydroascorbate reductase (MDHAR), dehydroascorbate reductase (DHAR)e5
- Direction
- increasede5
- Qualifier
- with the maximum after 12 h stresse5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Taking cucumber cultivar 'Jinchun 4' as test material”
e5“The activities of ascorbate peroxidase (APx), monodehydroascorbate reductase (MDHAR), dehydroascorbate reductase (DHAR), and glutathione reductase (GR) in the seedling leaves under high temperature stress increased markedly, with the maximum after 12 h stress”
Claim · model-written summary
High-temperature stress increased glutathione reductase (GR) activity in seedling leaves, with the maximum after 12 h of stress.
- Taxon
- cucumberCucumis sativuse0
- Organ / stage
- seedling leavese5
- Treatment
- high temperature stresse5
- Gene
- glutathione reductase (GR)e5
- Outcome
- glutathione reductase (GR)e5
- Direction
- increasede5
- Qualifier
- with the maximum after 12 h stresse5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Taking cucumber cultivar 'Jinchun 4' as test material”
e5“The activities of ascorbate peroxidase (APx), monodehydroascorbate reductase (MDHAR), dehydroascorbate reductase (DHAR), and glutathione reductase (GR) in the seedling leaves under high temperature stress increased markedly, with the maximum after 12 h stress”
Claim · model-written summary
Foliar melatonin restrained the accumulation of H2O2 and MDA in seedling leaves.
- Taxon
- cucumberCucumis sativuse0
- Organ / stage
- seedling leavese6
- Treatment
- Foliar spraying MTe6
- Outcome
- accumulation of H2O2 and MDAe6
- Direction
- restraine6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Taking cucumber cultivar 'Jinchun 4' as test material”
e6“Foliar spraying MT could effectively restrain the accumulation of H2O2 and MDA in seedling leaves”
Claim · model-written summary
Foliar melatonin increased leaf AsA and GSH contents.
- Taxon
- cucumberCucumis sativuse0
- Organ / stage
- leafe7
- Treatment
- Foliar spraying MTe6
- Outcome
- AsA and GSH contentse7
- Direction
- increasee7
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Taking cucumber cultivar 'Jinchun 4' as test material”
e6“Foliar spraying MT could effectively restrain the accumulation of H2O2 and MDA in seedling leaves”
e7“increase the leaf AsA and GSH contents and the activities of ascorbic acid metabolizing enzymes APx, MDHAR, GR and DHAR”
Claim · model-written summary
Foliar melatonin increased the activities of APx, MDHAR and GR.
- Taxon
- cucumberCucumis sativuse0
- Organ / stage
- leafe7
- Treatment
- Foliar spraying MTe6
- Gene
- APx, MDHAR, GRe7
- Outcome
- activities of ascorbic acid metabolizing enzymese7
- Direction
- increasee7
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Taking cucumber cultivar 'Jinchun 4' as test material”
e6“Foliar spraying MT could effectively restrain the accumulation of H2O2 and MDA in seedling leaves”
e7“increase the leaf AsA and GSH contents and the activities of ascorbic acid metabolizing enzymes APx, MDHAR, GR and DHAR”
Claim · model-written summary
Foliar melatonin increased the activity of DHAR.
- Taxon
- cucumberCucumis sativuse0
- Organ / stage
- leafe7
- Treatment
- Foliar spraying MTe6
- Gene
- DHARe7
- Outcome
- activities of ascorbic acid metabolizing enzymese7
- Direction
- increasee7
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Taking cucumber cultivar 'Jinchun 4' as test material”
e6“Foliar spraying MT could effectively restrain the accumulation of H2O2 and MDA in seedling leaves”
e7“increase the leaf AsA and GSH contents and the activities of ascorbic acid metabolizing enzymes APx, MDHAR, GR and DHAR”
Claim · model-written summary
Foliar melatonin enhanced H2O2-scavenging ability (author interpretation).
- Taxon
- cucumberCucumis sativuse0
- Treatment
- Foliar spraying MTe6
- Outcome
- H2O2-scavenging abilitye7
- Direction
- enhancee7
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Taking cucumber cultivar 'Jinchun 4' as test material”
e6“Foliar spraying MT could effectively restrain the accumulation of H2O2 and MDA in seedling leaves”
e7“enhance the H2O2-scavenging ability”
Claim · model-written summary
Foliar melatonin inhibited active O2 production (author interpretation).
- Taxon
- cucumberCucumis sativuse0
- Treatment
- Foliar spraying MTe6
- Outcome
- production of active O2e7
- Direction
- inhibite7
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Taking cucumber cultivar 'Jinchun 4' as test material”
e6“Foliar spraying MT could effectively restrain the accumulation of H2O2 and MDA in seedling leaves”
e7“inhibit the production of active O2”
Claim · model-written summary
Foliar melatonin maintained cell membrane stability (author interpretation).
- Taxon
- cucumberCucumis sativuse0
- Treatment
- Foliar spraying MTe6
- Outcome
- stability of cell membranee7
- Direction
- maintaine7
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Taking cucumber cultivar 'Jinchun 4' as test material”
e6“Foliar spraying MT could effectively restrain the accumulation of H2O2 and MDA in seedling leaves”
e7“maintain the stability of cell membrane”
Claim · model-written summary
Foliar melatonin reduced the damage of high temperature to the plants (author interpretation).
- Taxon
- cucumberCucumis sativuse0
- Treatment
- Foliar spraying MTe6
- Outcome
- damage of high temperature to the plantse7
- Direction
- reducee7
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Taking cucumber cultivar 'Jinchun 4' as test material”
e6“Foliar spraying MT could effectively restrain the accumulation of H2O2 and MDA in seedling leaves”
e7“reduce the damage of high temperature to the plants”
Claim · model-written summary
Foliar melatonin improved the high-temperature stress tolerance of cucumber seedlings (author interpretation).
- Taxon
- cucumberCucumis sativuse0
- Treatment
- Foliar spraying MTe6
- Outcome
- ability of cucumber seedlings against high temperature stresse7
- Direction
- improvee7
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Taking cucumber cultivar 'Jinchun 4' as test material”
e6“Foliar spraying MT could effectively restrain the accumulation of H2O2 and MDA in seedling leaves”
e7“improve the ability of cucumber seedlings against high temperature stress”
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8 of 14 groups shown: named compounds and organisms first, then groups whose results differ (checked claim by claim), then those with positive and negative results, then the smaller groups.
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.