Abstract
Melatonin is involved in defending against oxidative stress caused by various environmental stresses in plants. In this study, the roles of exogenous melatonin in regulating local and systemic defense against photooxidative stress in cucumber (Cucumis sativus) and the involvement of redox signaling were examined. Foliar or rhizospheric treatment with melatonin enhanced tolerance to photooxidative stress in both melatonin-treated leaves and untreated systemic leaves. Increased melatonin levels are capable of increasing glutathione (reduced glutathione [GSH]) redox status. Application of H2 O2 and GSH also induced tolerance to photooxidative stress, while inhibition of H2 O2 accumulation and GSH synthesis compromised melatonin-induced local and systemic tolerance to photooxidative stress. H2 O2 treatment increased the GSH/oxidized glutathione (GSSG) ratio, while inhibition of H2 O2 accumulation prevented a melatonin-induced increase in the GSH/GSSG ratio. Additionally, inhibition of GSH synthesis blocked H2 O2 -induced photooxidative stress tolerance, whereas scavenging or inhibition of H2 O2 production attenuated but did not abolish GSH-induced tolerance to photooxidative stress. These results strongly suggest that exogenous melatonin is capable of inducing both local and systemic defense against photooxidative stress and melatonin-enhanced GSH/GSSG ratio in a H2 O2 -dependent manner is critical in the induction of tolerance.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 12
Claim · model-written summary
Foliar melatonin enhanced local and systemic photooxidative stress tolerance.
- Taxon
- cucumber
Cucumis sativuse1 - Treatment
- Foliare0
- Outcome
- tolerance to photooxidative stresse0
- Direction
- enhancede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Foliar or rhizospheric treatment with melatonin enhanced tolerance to photooxidative stress in both melatonin-treated leaves and untreated systemic leaves.”
e1“cucumber (Cucumis sativus)”
Claim · model-written summary
Rhizospheric melatonin enhanced local and systemic photooxidative stress tolerance.
- Taxon
- cucumberCucumis sativuse1
- Treatment
- rhizospheric treatment with melatonine0
- Outcome
- tolerance to photooxidative stresse0
- Direction
- enhancede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Foliar or rhizospheric treatment with melatonin enhanced tolerance to photooxidative stress in both melatonin-treated leaves and untreated systemic leaves.”
e1“cucumber (Cucumis sativus)”
Claim · model-written summary
Increased melatonin raised glutathione redox status.
- Taxon
- cucumberCucumis sativuse1
- Compound
- melatonine0
- Outcome
- glutathione (reduced glutathione [GSH]) redox statuse0
- Direction
- increasinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increased melatonin levels are capable of increasing glutathione (reduced glutathione [GSH]) redox status.”
e1“cucumber (Cucumis sativus)”
Claim · model-written summary
H2 O2 application induced tolerance to photooxidative stress.
- Taxon
- cucumberCucumis sativuse1
- Treatment
- H2 O2e0
- Outcome
- tolerance to photooxidative stresse0
- Direction
- inducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Application of H2 O2 and GSH also induced tolerance to photooxidative stress”
e1“cucumber (Cucumis sativus)”
Claim · model-written summary
GSH application induced tolerance to photooxidative stress.
- Taxon
- cucumberCucumis sativuse1
- Treatment
- GSHe0
- Outcome
- tolerance to photooxidative stresse0
- Direction
- inducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Application of H2 O2 and GSH also induced tolerance to photooxidative stress”
e1“cucumber (Cucumis sativus)”
Claim · model-written summary
Inhibiting H2 O2 accumulation compromised melatonin induced local and systemic tolerance.
- Taxon
- cucumberCucumis sativuse1
- Treatment
- inhibition of H2 O2 accumulatione0
- Outcome
- melatonin-induced local and systemic tolerance to photooxidative stresse0
- Direction
- compromisede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“inhibition of H2 O2 accumulation and GSH synthesis compromised melatonin-induced local and systemic tolerance to photooxidative stress”
e1“cucumber (Cucumis sativus)”
Claim · model-written summary
Inhibiting GSH synthesis compromised melatonin induced local and systemic tolerance.
- Taxon
- cucumberCucumis sativuse1
- Treatment
- inhibition of H2 O2 accumulation and GSH synthesise0
- Outcome
- melatonin-induced local and systemic tolerance to photooxidative stresse0
- Direction
- compromisede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“inhibition of H2 O2 accumulation and GSH synthesis compromised melatonin-induced local and systemic tolerance to photooxidative stress”
e1“cucumber (Cucumis sativus)”
Claim · model-written summary
H2 O2 treatment increased the GSH/GSSG ratio.
- Taxon
- cucumberCucumis sativuse1
- Treatment
- H2 O2 treatmente0
- Outcome
- GSH/oxidized glutathione (GSSG) ratioe0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“H2 O2 treatment increased the GSH/oxidized glutathione (GSSG) ratio”
e1“cucumber (Cucumis sativus)”
Claim · model-written summary
Blocking H2 O2 accumulation prevented the melatonin induced rise in GSH/GSSG ratio.
- Taxon
- cucumberCucumis sativuse1
- Treatment
- inhibition of H2 O2 accumulatione0
- Outcome
- melatonin-induced increase in the GSH/GSSG ratioe0
- Direction
- preventede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“inhibition of H2 O2 accumulation prevented a melatonin-induced increase in the GSH/GSSG ratio”
e1“cucumber (Cucumis sativus)”
Claim · model-written summary
GSH synthesis inhibition blocked H2 O2 induced stress tolerance.
- Taxon
- cucumberCucumis sativuse1
- Treatment
- inhibition of GSH synthesise0
- Outcome
- H2 O2 -induced photooxidative stress tolerancee0
- Direction
- blockede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“inhibition of GSH synthesis blocked H2 O2 -induced photooxidative stress tolerance”
e1“cucumber (Cucumis sativus)”
Claim · model-written summary
Scavenging H2 O2 attenuated GSH induced tolerance.
- Taxon
- cucumberCucumis sativuse1
- Treatment
- scavenginge0
- Outcome
- GSH-induced tolerance to photooxidative stresse0
- Direction
- attenuatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“scavenging or inhibition of H2 O2 production attenuated but did not abolish GSH-induced tolerance to photooxidative stress”
e1“cucumber (Cucumis sativus)”
Claim · model-written summary
Inhibiting H2 O2 production attenuated GSH induced tolerance.
- Taxon
- cucumberCucumis sativuse1
- Treatment
- inhibition of H2 O2 productione0
- Outcome
- GSH-induced tolerance to photooxidative stresse0
- Direction
- attenuatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“scavenging or inhibition of H2 O2 production attenuated but did not abolish GSH-induced tolerance to photooxidative stress”
e1“cucumber (Cucumis sativus)”
The same questions in other papers
hydrogen peroxide · molecular: metabolites · Cucumis sativus (cucumber)Positive and negative results
1 paper in the same direction as this paper · 1 in the opposite direction
- negative
- positive
glutathione · physiology: oxidative · Cucumis sativus (cucumber)Positive and negative results
5 in the opposite direction
- positive
- positive
- positive
2 papers more in this group
See all 6 papers →melatonin · disease · Cucumis sativus (cucumber)Positive and negative results
5 papers in the same direction as this paper · 1 in the opposite direction
- negative
- positive
- positive
3 papers more in this group
See all 7 papers →glutathione · disease · Cucumis sativus (cucumber)Results agree
3 papers in the same direction as this paper
- positive
- positive
- positive
application · disease · Cucumis sativus (cucumber)Positive and negative results
59 papers in the same direction as this paper · 7 in the opposite direction
- negative
- negative
- negative
63 papers more in this group
See all 67 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.