Abstract
The role of plant antioxidant systems in stress tolerance was studied in leaves of three contrasting wheat genotypes. Drought imposed at two different stages after anthesis resulted in an increase in H2O2 accumulation and lipid peroxidation and decrease in ascorbic acid content. Antioxidant enzymes like superoxide dismutase, ascorbate peroxidase and catalase significantly increased under water stress. Drought tolerant genotype C 306 which had highest ascorbate peroxidase and catalase activity and ascorbic acid content also showed lowest H2O2 accumulation and lipid peroxidation (malondialdehyde content) under water stress in comparison to susceptible genotype HD 2329 which showed lowest antioxidant enzyme activity and ascorbic acid content and highest H2O2 content and lipid peroxidation. HD 2285 which is tolerant to high temperature during grain filling period showed intermediate behaviour. Superoxide dismutase activity, however, did not show significant differences among the genotypes under irrigated as well as water stress condition. It seems that H2O2 scavenging systems as represented by ascorbate peroxidase and catalase are more important in imparting tolerance against drought induced oxidative stress than superoxide dismutase alone.
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Claims 10
Claim · model-written summary
Drought increased H2O2 accumulation and lipid peroxidation.
- Taxon
- Wheat
Triticum aestivumt0 - Organ / stage
- after anthesise0
- Treatment
- Droughte0
- Outcome
- H2O2 accumulation and lipid peroxidatione0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Drought imposed at two different stages after anthesis resulted in an increase in H2O2 accumulation and lipid peroxidation and decrease in ascorbic acid content.”
t0“Wheat”
Claim · model-written summary
Drought decreased ascorbic acid content.
- Taxon
- WheatTriticum aestivumt0
- Treatment
- Droughte0
- Outcome
- ascorbic acid contente0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Drought imposed at two different stages after anthesis resulted in an increase in H2O2 accumulation and lipid peroxidation and decrease in ascorbic acid content.”
t0“Wheat”
Claim · model-written summary
Water stress significantly increased superoxide dismutase, ascorbate peroxidase and catalase.
- Taxon
- WheatTriticum aestivumt0
- Treatment
- water stresse0
- Outcome
- superoxide dismutase, ascorbate peroxidase and catalasee0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Antioxidant enzymes like superoxide dismutase, ascorbate peroxidase and catalase significantly increased under water stress.”
t0“Wheat”
Claim · model-written summary
C 306 had the highest ascorbate peroxidase and catalase activity and ascorbic acid content under water stress.
- Taxon
- WheatTriticum aestivumt0
- Material
- C 306e0
- Treatment
- water stresse0
- Outcome
- ascorbate peroxidase and catalase activity and ascorbic acid contente0
- Direction
- higheste0
- Comparator
- HD 2329e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Drought tolerant genotype C 306 which had highest ascorbate peroxidase and catalase activity and ascorbic acid content also showed lowest H2O2 accumulation and lipid peroxidation (malondialdehyde content) under water stress in comparison to susceptible genotype HD 2329”
t0“Wheat”
Claim · model-written summary
C 306 had the lowest H2O2 accumulation and lipid peroxidation under water stress versus HD 2329.
- Taxon
- WheatTriticum aestivumt0
- Material
- C 306e0
- Outcome
- H2O2 accumulation and lipid peroxidatione0
- Direction
- loweste0
- Comparator
- HD 2329e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Drought tolerant genotype C 306 which had highest ascorbate peroxidase and catalase activity and ascorbic acid content also showed lowest H2O2 accumulation and lipid peroxidation (malondialdehyde content) under water stress in comparison to susceptible genotype HD 2329”
t0“Wheat”
Claim · model-written summary
HD 2329 showed the lowest antioxidant enzyme activity and ascorbic acid content.
- Taxon
- WheatTriticum aestivumt0
- Material
- HD 2329e0
- Outcome
- antioxidant enzyme activity and ascorbic acid contente0
- Direction
- loweste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“susceptible genotype HD 2329 which showed lowest antioxidant enzyme activity and ascorbic acid content and highest H2O2 content and lipid peroxidation”
t0“Wheat”
Claim · model-written summary
HD 2329 showed the highest H2O2 content and lipid peroxidation.
- Taxon
- WheatTriticum aestivumt0
- Material
- HD 2329e0
- Outcome
- H2O2 content and lipid peroxidatione0
- Direction
- higheste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“susceptible genotype HD 2329 which showed lowest antioxidant enzyme activity and ascorbic acid content and highest H2O2 content and lipid peroxidation”
t0“Wheat”
Claim · model-written summary
HD 2285 showed an intermediate response.
- Taxon
- WheatTriticum aestivumt0
- Material
- HD 2285e0
- Outcome
- intermediate behavioure0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“HD 2285 which is tolerant to high temperature during grain filling period showed intermediate behaviour.”
t0“Wheat”
Claim · model-written summary
Superoxide dismutase activity did not differ significantly among genotypes under irrigation or water stress.
- Taxon
- WheatTriticum aestivumt0
- Treatment
- water stress conditione0
- Outcome
- Superoxide dismutase activitye0
- Direction
- did not show significant differencese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Superoxide dismutase activity, however, did not show significant differences among the genotypes under irrigated as well as water stress condition.”
t0“Wheat”
Claim · model-written summary
The authors suggest H2O2 scavenging by ascorbate peroxidase and catalase contributes more to drought oxidative stress tolerance than superoxide dismutase alone.
- Taxon
- WheatTriticum aestivumt0
- Gene
- ascorbate peroxidase and catalasee0
- Outcome
- tolerance against drought induced oxidative stresse0
- Direction
- more importante0
- Comparator
- superoxide dismutasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“H2O2 scavenging systems as represented by ascorbate peroxidase and catalase are more important in imparting tolerance against drought induced oxidative stress than superoxide dismutase alone”
t0“Wheat”
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