Abstract
Lipid peroxidation is considered to be an important mechanism of leaf senescence. The peroxidation of lipids can be initiated by free radicals. H 2 O 2 itself is active oxygen species and can react with superoxide radicals to form more reactive hydroxyl radicals in the presence of trace amounts of Fe or Cu. Thus, it is of interest to inves- tigate the relationship between lipid peroxidation and H 2 O 2 -promoted senescence in detached rice leaves. H 2 O 2 ef- fectively promoted senescence and increased malondialdehyde levels in detached rice leaves under both light and dark conditions. However, the promotion of senescence by the exogenous level of H 2 O 2 is not associated with an increase in its endogenous level. Thiourea (a scavenger of hydroxyl radical) almost completely prevented H 2 O 2 - promoted senescence and the H 2 O 2 -induced decrease in superoxide dismutase and ascorbate peroxidase activities in light and darkness. It seems that promoted senescence by H 2 O 2 in detached rice leaves is associated free radical- induced lipid peroxidation.
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Claims 7
Claim · model-written summary
Hydrogen peroxide promoted senescence of detached rice leaves under light and dark conditions.
- Taxon
- rice
Oryza sativae0 - Treatment
- H 2 O 2e0
- Outcome
- senescencee0
- Direction
- promotede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“H 2 O 2 ef- fectively promoted senescence and increased malondialdehyde levels in detached rice leaves under both light and dark conditions”
Claim · model-written summary
Hydrogen peroxide increased malondialdehyde levels in detached rice leaves under light and dark conditions.
- Taxon
- riceOryza sativae0
- Treatment
- H 2 O 2e0
- Outcome
- malondialdehyde levelse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“H 2 O 2 ef- fectively promoted senescence and increased malondialdehyde levels in detached rice leaves under both light and dark conditions”
Claim · model-written summary
Promotion of senescence by exogenous H2O2 is not associated with an increase in endogenous H2O2 level in rice leaves.
- Taxon
- riceOryza sativae0
- Compound
- H 2 O 2e1
- Outcome
- endogenous levele1
- Direction
- not associated with an increasee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“H 2 O 2 ef- fectively promoted senescence and increased malondialdehyde levels in detached rice leaves under both light and dark conditions”
e1“the promotion of senescence by the exogenous level of H 2 O 2 is not associated with an increase in its endogenous level”
Claim · model-written summary
Thiourea almost completely prevented H2O2-promoted senescence of detached rice leaves.
- Taxon
- riceOryza sativae0
- Treatment
- Thioureae2
- Outcome
- senescencee2
- Direction
- preventede2
- Comparator
- H 2 O 2e2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“H 2 O 2 ef- fectively promoted senescence and increased malondialdehyde levels in detached rice leaves under both light and dark conditions”
e2“Thiourea (a scavenger of hydroxyl radical) almost completely prevented H 2 O 2 - promoted senescence and the H 2 O 2 -induced decrease in superoxide dismutase and ascorbate peroxidase activities in light and darkness”
Claim · model-written summary
Thiourea prevented the H2O2-induced decrease in superoxide dismutase and ascorbate peroxidase activities in light and darkness.
- Taxon
- riceOryza sativae0
- Treatment
- Thioureae2
- Gene
- superoxide dismutase and ascorbate peroxidasee2
- Outcome
- H 2 O 2 -induced decrease in superoxide dismutase and ascorbate peroxidase activitiese2
- Direction
- preventede2
- Comparator
- H 2 O 2e2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“H 2 O 2 ef- fectively promoted senescence and increased malondialdehyde levels in detached rice leaves under both light and dark conditions”
e2“Thiourea (a scavenger of hydroxyl radical) almost completely prevented H 2 O 2 - promoted senescence and the H 2 O 2 -induced decrease in superoxide dismutase and ascorbate peroxidase activities in light and darkness”
Claim · model-written summary
Hydrogen peroxide decreased superoxide dismutase and ascorbate peroxidase activities in detached rice leaves.
- Taxon
- riceOryza sativae0
- Treatment
- H 2 O 2e2
- Gene
- superoxide dismutase and ascorbate peroxidasee2
- Outcome
- superoxide dismutase and ascorbate peroxidase activitiese2
- Direction
- decreasee2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“H 2 O 2 ef- fectively promoted senescence and increased malondialdehyde levels in detached rice leaves under both light and dark conditions”
e2“Thiourea (a scavenger of hydroxyl radical) almost completely prevented H 2 O 2 - promoted senescence and the H 2 O 2 -induced decrease in superoxide dismutase and ascorbate peroxidase activities in light and darkness”
Claim · model-written summary
Promoted senescence by H2O2 in detached rice leaves is associated with free radical-induced lipid peroxidation.
- Taxon
- riceOryza sativae0
- Treatment
- H 2 O 2e3
- Outcome
- senescencee3
- Qualifier
- free radical- induced lipid peroxidatione3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“H 2 O 2 ef- fectively promoted senescence and increased malondialdehyde levels in detached rice leaves under both light and dark conditions”
e3“It seems that promoted senescence by H 2 O 2 in detached rice leaves is associated free radical- induced lipid peroxidation”
The same questions in other papers
hydrogen peroxide · physiology: antioxidant enzymes · Oryza sativa (rice)Results differ
3 papers in the same direction as this paper · 6 in the opposite direction
- positive
- negative
- positive
6 papers more in this group
See all 10 papers →hydrogen peroxide · physiology: oxidative · Oryza sativa (rice)Positive and negative results
3 papers in the same direction as this paper · 4 in the opposite direction
- negative
- positive
- positive
4 papers more in this group
See all 8 papers →thiourea · physiology: oxidative · Oryza sativa (rice)Results agree
1 paper in the same direction as this paper
- 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.