Abstract
The thermotolerance and activation of antioxidant enzymes in the leaves of cucumber and tomato seedlings were induced by foliar application of H2O2. The induction of thermotolerance by foliar application of H2O2 was detected with decreased electrolyte leakage and malondialdehyde (MDA) content and increased water-soluble protein and chlorophyll content compared with heat-stressed seedlings. The levels of H2O2 and superoxide anions in the leaves of heat-stressed seedlings were also reduced by H2O2 pre-application before exposure to heat stress. The specific activities of ascorbic peroxidase (APX) and glucose-6-phosphate dehydrogenase (G6PDH) in the leaves of cucumber and tomato seedlings were significantly increased by foliar application of H2O2. The gel activities of superoxide dismutase (SOD), hydrogen peroxidase (HPX), and polyphenol oxidase (PPO) isozymes were abruptly increased by foliar application of H2O2 and these were maintained for 10 d afterward. The gel activities of guaiacol peroxidase (GPX) in the leaves of cucumber seedlings were significantly increased by foliar application of H2O2, but this did not occur in tomato leaves. Although one or two isoforms of SOD, HPX, and PPO isozymes in tomato leaves were suppressed by foliar application of H2O2, the total gel activities of the antioxidant enzymes were increased. These results suggest that foliar application of H2O2 before a crop is subjected to heat stress may be an effective and method to alleviate heat stress.
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Claims 14
Claim · model-written summary
H2O2 application induced thermotolerance in cucumber seedlings.
- Taxon
- cucumber
Cucumis sativuse0 - Treatment
- foliar application of H2O2e0
- Outcome
- thermotolerancee0
- Direction
- inducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“thermotolerance and activation of antioxidant enzymes in the leaves of cucumber and tomato seedlings were induced by foliar application of H2O2”
Claim · model-written summary
H2O2 application induced thermotolerance in tomato seedlings.
- Taxon
- tomato
Solanum lycopersicume0 - Treatment
- foliar application of H2O2e0
- Outcome
- thermotolerancee0
- Direction
- inducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“thermotolerance and activation of antioxidant enzymes in the leaves of cucumber and tomato seedlings were induced by foliar application of H2O2”
Claim · model-written summary
H2O2 pretreatment reduced electrolyte leakage and MDA content relative to heat-stressed seedlings.
- Taxon
- Cucumber and Tomato SeedlingsCucumis sativusSolanum lycopersicumt0
- Treatment
- foliar application of H2O2e0
- Outcome
- electrolyte leakage and malondialdehyde (MDA) contente0
- Direction
- decreasede0
- Comparator
- heat-stressed seedlingse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“foliar application of H2O2 was detected with decreased electrolyte leakage and malondialdehyde (MDA) content and increased water-soluble protein and chlorophyll content compared with heat-stressed seedlings”
t0“Cucumber and Tomato Seedlings”
Claim · model-written summary
H2O2 pretreatment increased water-soluble protein and chlorophyll content relative to heat-stressed seedlings.
- Taxon
- Cucumber and Tomato SeedlingsCucumis sativusSolanum lycopersicumt0
- Treatment
- foliar application of H2O2e0
- Outcome
- water-soluble protein and chlorophyll contente0
- Direction
- increasede0
- Comparator
- heat-stressed seedlingse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“foliar application of H2O2 was detected with decreased electrolyte leakage and malondialdehyde (MDA) content and increased water-soluble protein and chlorophyll content compared with heat-stressed seedlings”
t0“Cucumber and Tomato Seedlings”
Claim · model-written summary
H2O2 preapplication reduced H2O2 and superoxide anions in heat-stressed leaves.
- Taxon
- Cucumber and Tomato SeedlingsCucumis sativusSolanum lycopersicumt0
- Treatment
- H2O2 pre-applicatione0
- Outcome
- levels of H2O2 and superoxide anionse0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The levels of H2O2 and superoxide anions in the leaves of heat-stressed seedlings were also reduced by H2O2 pre-application before exposure to heat stress”
t0“Cucumber and Tomato Seedlings”
Claim · model-written summary
H2O2 foliar application significantly increased APX and G6PDH specific activities in cucumber leaves.
- Taxon
- cucumberCucumis sativuse0
- Treatment
- foliar application of H2O2e0
- Outcome
- specific activities of ascorbic peroxidase (APX) and glucose-6-phosphate dehydrogenase (G6PDH)e0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“specific activities of ascorbic peroxidase (APX) and glucose-6-phosphate dehydrogenase (G6PDH) in the leaves of cucumber and tomato seedlings were significantly increased by foliar application of H2O2”
Claim · model-written summary
H2O2 foliar application significantly increased APX and G6PDH specific activities in tomato leaves.
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- foliar application of H2O2e0
- Outcome
- specific activities of ascorbic peroxidase (APX) and glucose-6-phosphate dehydrogenase (G6PDH)e0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“specific activities of ascorbic peroxidase (APX) and glucose-6-phosphate dehydrogenase (G6PDH) in the leaves of cucumber and tomato seedlings were significantly increased by foliar application of H2O2”
Claim · model-written summary
H2O2 increased SOD, HPX and PPO isozyme gel activities, maintained for 10 days, in cucumber seedlings.
- Taxon
- CucumberCucumis sativust0
- Treatment
- foliar application of H2O2e0
- Outcome
- gel activities of superoxide dismutase (SOD), hydrogen peroxidase (HPX), and polyphenol oxidase (PPO) isozymese0
- Direction
- increasede0
- Qualifier
- maintained for 10 d afterwarde0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“gel activities of superoxide dismutase (SOD), hydrogen peroxidase (HPX), and polyphenol oxidase (PPO) isozymes were abruptly increased by foliar application of H2O2 and these were maintained for 10 d afterward”
t0“Cucumber and Tomato Seedlings”
Claim · model-written summary
H2O2 increased SOD, HPX and PPO isozyme gel activities, maintained for 10 days, in tomato seedlings.
- Taxon
- TomatoSolanum lycopersicumt0
- Treatment
- foliar application of H2O2e0
- Outcome
- gel activities of superoxide dismutase (SOD), hydrogen peroxidase (HPX), and polyphenol oxidase (PPO) isozymese0
- Direction
- increasede0
- Qualifier
- maintained for 10 d afterwarde0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“gel activities of superoxide dismutase (SOD), hydrogen peroxidase (HPX), and polyphenol oxidase (PPO) isozymes were abruptly increased by foliar application of H2O2 and these were maintained for 10 d afterward”
t0“Cucumber and Tomato Seedlings”
Claim · model-written summary
H2O2 significantly increased GPX gel activities in cucumber leaves.
- Taxon
- cucumberCucumis sativuse0
- Treatment
- foliar application of H2O2e0
- Outcome
- gel activities of guaiacol peroxidase (GPX)e0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“gel activities of guaiacol peroxidase (GPX) in the leaves of cucumber seedlings were significantly increased by foliar application of H2O2”
Claim · model-written summary
The GPX gel activity increase seen in cucumber did not occur in tomato leaves.
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- foliar application of H2O2e0
- Outcome
- gel activities of guaiacol peroxidase (GPX)e0
- Direction
- did not occure0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“gel activities of guaiacol peroxidase (GPX) in the leaves of cucumber seedlings were significantly increased by foliar application of H2O2, but this did not occur in tomato leaves”
Claim · model-written summary
H2O2 suppressed one or two SOD, HPX and PPO isoforms in tomato leaves.
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- foliar application of H2O2e0
- Outcome
- one or two isoforms of SOD, HPX, and PPO isozymese0
- Direction
- suppressede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“one or two isoforms of SOD, HPX, and PPO isozymes in tomato leaves were suppressed by foliar application of H2O2”
Claim · model-written summary
Total antioxidant enzyme gel activities increased in tomato leaves despite suppression of some isoforms.
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- foliar application of H2O2e0
- Outcome
- total gel activities of the antioxidant enzymese0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“isozymes in tomato leaves were suppressed by foliar application of H2O2, the total gel activities of the antioxidant enzymes were increased”
Claim · model-written summary
The authors suggest foliar H2O2 before heat stress may alleviate crop heat stress.
- Taxon
- Cucumber and Tomato SeedlingsCucumis sativusSolanum lycopersicumt0
- Outcome
- foliar application of H2O2 before a crop is subjected to heat stresse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“foliar application of H2O2 before a crop is subjected to heat stress may be an effective and method to alleviate heat stress”
t0“Cucumber and Tomato Seedlings”
The same questions in other papers
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hydrogen peroxide · physiology: antioxidant enzymes · Solanum lycopersicum (tomato)Results agree
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See all 6 papers →8 of 16 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.