Abstract
Changes in the catalase activity and the effect of hydrogen peroxide (H 2 O 2 ) were studied during the senescence of excised rice (Oryza sativa L. cv. Ratna) leaves. Catalase activity declined upon detachment of leaves. Regression analysis showed a strong positive correlation between the decline in the catalase activity with the decline in the soluble protein content (r = 0.9827; n = 13). Infiltration of H 2 O 2 into the leaves accelerated chlorophyll loss and α-amino nitrogen accumulation. Infiltration of glycolate or xanthine (serving as substrates for the formation of H 2 O 2 ) into the leaves had a similar effect. Application of aminotriazole, a strong inhibitor of catalase, also accelerated the senescence of excised rice leaves. These results indicate that leaf senescence can be accelerated by increasing the endogenous H 2 O 2 level in the leaf tissues.
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Claims 8
Claim · model-written summary
Catalase activity declined after rice leaf detachment.
- Taxon
- rice
Oryza sativat0 - Organ / stage
- leavese0
- Outcome
- Catalase activitye0
- Direction
- declinede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Catalase activity declined upon detachment of leaves.”
t0“rice leaves”
Claim · model-written summary
Declines in catalase activity and soluble protein content were strongly positively correlated.
- Taxon
- riceOryza sativat0
- Outcome
- decline in the catalase activitye0
- Direction
- strong positive correlatione0
- Value
- r = 0.9827e0
- Comparator
- decline in the soluble protein contente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“strong positive correlation between the decline in the catalase activity with the decline in the soluble protein content (r = 0.9827; n = 13)”
t0“rice leaves”
Claim · model-written summary
Hydrogen peroxide infiltration accelerated chlorophyll loss in rice leaves.
- Taxon
- riceOryza sativat0
- Treatment
- Infiltration of H 2 O 2e0
- Outcome
- chlorophyll losse0
- Direction
- acceleratede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Infiltration of H 2 O 2 into the leaves accelerated chlorophyll loss and α-amino nitrogen accumulation.”
t0“rice leaves”
Claim · model-written summary
Hydrogen peroxide infiltration accelerated α-amino nitrogen accumulation.
- Taxon
- riceOryza sativat0
- Treatment
- Infiltration of H 2 O 2e0
- Outcome
- α-amino nitrogen accumulatione0
- Direction
- acceleratede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Infiltration of H 2 O 2 into the leaves accelerated chlorophyll loss and α-amino nitrogen accumulation.”
t0“rice leaves”
Claim · model-written summary
Glycolate infiltration had a similar senescence effect.
- Taxon
- riceOryza sativat0
- Treatment
- Infiltration of glycolatee0
- Outcome
- similar effecte0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Infiltration of glycolate or xanthine (serving as substrates for the formation of H 2 O 2 ) into the leaves had a similar effect.”
t0“rice leaves”
Claim · model-written summary
Xanthine infiltration had a similar senescence effect.
- Taxon
- riceOryza sativat0
- Treatment
- xanthinee0
- Outcome
- similar effecte0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Infiltration of glycolate or xanthine (serving as substrates for the formation of H 2 O 2 ) into the leaves had a similar effect.”
t0“rice leaves”
Claim · model-written summary
Aminotriazole application accelerated senescence of excised rice leaves.
- Taxon
- riceOryza sativae0
- Treatment
- Application of aminotriazolee0
- Gene
- catalasee0
- Outcome
- senescence of excised rice leavese0
- Direction
- acceleratede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Application of aminotriazole, a strong inhibitor of catalase, also accelerated the senescence of excised rice leaves.”
Claim · model-written summary
The authors infer that increasing endogenous hydrogen peroxide can accelerate leaf senescence.
- Taxon
- riceOryza sativat0
- Outcome
- leaf senescencee0
- Direction
- acceleratede0
- Qualifier
- increasing the endogenous H 2 O 2 levele0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“leaf senescence can be accelerated by increasing the endogenous H 2 O 2 level in the leaf tissues.”
t0“rice leaves”
The same questions in other papers
hydrogen peroxide · physiology: pigments · Oryza sativa (rice)Results differ
3 papers in the same direction as this paper · 1 in the opposite direction
- negative
- positive
- no effect
1 paper more in this group
See all 5 papers →hydrogen peroxide · nutrient: content · Oryza sativa (rice)Positive and negative results
2 papers in the same direction as this paper · 3 in the opposite direction
- positive
- positive
- positive
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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.