Abstract
A field experiment was conducted to study the response of antioxidant enzymes to oxidative damage caused by heat stress induced by changing dates of transplanting in two rice (Oryza sativa L.) genotypes viz., ‘N22’ (heat tolerant) and ‘IR8’ (heat susceptible). During grain filling period, constitutive level of antioxidative enzymes viz., superoxide dismutase, catalase, ascorbate peroxidase, was found to be 35.7, 88.8 and 84.1% higher respectively, while the content of non-enzymatic antioxidants viz., ascorbate and proline was 78.5 and 81.8% higher respectively, in ‘N22’ than in ‘IR8’ under heat stress encountered during early transplanting. In contrast, the hydrogen peroxide and malondialdehyde content were 42.1 and 28.4% higher in ‘IR8’ during early transplanting. Heat stress resulted in significant reduction of chlorophyll content during early transplanting in both the genotypes though the reduction was less in ‘N22’ (27.6%) as compared to ‘IR8’ (45.2%). The increased and timely response of antioxidant enzymes along with the non enzymatic antioxidants is suggestive of their significant role in development of tolerance exhibited by the cultivar ‘N22’ under heat stress conditions.
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Claims 11
Claim · model-written summary
Superoxide dismutase was 35.7% higher in heat-tolerant N22 than in IR8 under heat stress.
- Taxon
- Rice (Oryza sativa L.)
Oryza sativat0 - Material
- N22e1
- Treatment
- heat stresse1
- Outcome
- superoxide dismutasee0
- Direction
- highere0
- Value
- 35.7e0
- Comparator
- IR8e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Rice (Oryza sativa L.) Genotypes”
e0“constitutive level of antioxidative enzymes viz., superoxide dismutase, catalase, ascorbate peroxidase, was found to be 35.7, 88.8 and 84.1% higher respectively”
e1“in ‘N22’ than in ‘IR8’ under heat stress encountered during early transplanting”
Claim · model-written summary
Catalase was 88.8% higher in heat-tolerant N22 than in IR8 under heat stress.
- Taxon
- Rice (Oryza sativa L.)Oryza sativat0
- Material
- N22e1
- Treatment
- heat stresse1
- Outcome
- catalasee0
- Direction
- highere0
- Value
- 88.8e0
- Comparator
- IR8e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Rice (Oryza sativa L.) Genotypes”
e0“constitutive level of antioxidative enzymes viz., superoxide dismutase, catalase, ascorbate peroxidase, was found to be 35.7, 88.8 and 84.1% higher respectively”
e1“in ‘N22’ than in ‘IR8’ under heat stress encountered during early transplanting”
Claim · model-written summary
Ascorbate peroxidase was 84.1% higher in heat-tolerant N22 than in IR8 under heat stress.
- Taxon
- Rice (Oryza sativa L.)Oryza sativat0
- Material
- N22e1
- Treatment
- heat stresse1
- Outcome
- ascorbate peroxidasee0
- Direction
- highere0
- Value
- 84.1%e0
- Comparator
- IR8e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Rice (Oryza sativa L.) Genotypes”
e0“constitutive level of antioxidative enzymes viz., superoxide dismutase, catalase, ascorbate peroxidase, was found to be 35.7, 88.8 and 84.1% higher respectively”
e1“in ‘N22’ than in ‘IR8’ under heat stress encountered during early transplanting”
Claim · model-written summary
Ascorbate was 78.5% higher in heat-tolerant N22 than in IR8 under heat stress.
- Taxon
- Rice (Oryza sativa L.)Oryza sativat0
- Material
- N22e1
- Treatment
- heat stresse1
- Outcome
- ascorbatee2
- Direction
- highere2
- Value
- 78.5e2
- Comparator
- IR8e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Rice (Oryza sativa L.) Genotypes”
e1“in ‘N22’ than in ‘IR8’ under heat stress encountered during early transplanting”
e2“the content of non-enzymatic antioxidants viz., ascorbate and proline was 78.5 and 81.8% higher respectively”
Claim · model-written summary
Proline was 81.8% higher in heat-tolerant N22 than in IR8 under heat stress.
- Taxon
- Rice (Oryza sativa L.)Oryza sativat0
- Material
- N22e1
- Treatment
- heat stresse1
- Outcome
- prolinee2
- Direction
- highere2
- Value
- 81.8%e2
- Comparator
- IR8e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Rice (Oryza sativa L.) Genotypes”
e1“in ‘N22’ than in ‘IR8’ under heat stress encountered during early transplanting”
e2“the content of non-enzymatic antioxidants viz., ascorbate and proline was 78.5 and 81.8% higher respectively”
Claim · model-written summary
Hydrogen peroxide content was 42.1% higher in IR8 than in N22 under heat stress.
- Taxon
- Rice (Oryza sativa L.)Oryza sativat0
- Material
- IR8e3
- Treatment
- heat stresse1
- Outcome
- hydrogen peroxidee3
- Direction
- highere3
- Value
- 42.1e3
- Comparator
- N22e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Rice (Oryza sativa L.) Genotypes”
e1“in ‘N22’ than in ‘IR8’ under heat stress encountered during early transplanting”
e3“the hydrogen peroxide and malondialdehyde content were 42.1 and 28.4% higher in ‘IR8’ during early transplanting”
Claim · model-written summary
Malondialdehyde content was 28.4% higher in IR8 than in N22 under heat stress.
- Taxon
- Rice (Oryza sativa L.)Oryza sativat0
- Material
- IR8e3
- Treatment
- heat stresse1
- Outcome
- malondialdehyde contente3
- Direction
- highere3
- Value
- 28.4e3
- Comparator
- N22e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Rice (Oryza sativa L.) Genotypes”
e1“in ‘N22’ than in ‘IR8’ under heat stress encountered during early transplanting”
e3“the hydrogen peroxide and malondialdehyde content were 42.1 and 28.4% higher in ‘IR8’ during early transplanting”
Claim · model-written summary
Heat stress significantly reduced chlorophyll content during early transplanting in both genotypes.
- Taxon
- Rice (Oryza sativa L.)Oryza sativat0
- Treatment
- Heat stresse4
- Outcome
- chlorophyll contente4
- Direction
- reductione4
- Qualifier
- during early transplantinge4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Rice (Oryza sativa L.) Genotypes”
e4“Heat stress resulted in significant reduction of chlorophyll content during early transplanting in both the genotypes though the reduction was less in ‘N22’ (27.6%) as compared to ‘IR8’ (45.2%)”
Claim · model-written summary
Chlorophyll reduction under heat stress was smaller in N22 (27.6%) than in IR8.
- Taxon
- Rice (Oryza sativa L.)Oryza sativat0
- Material
- N22e4
- Treatment
- Heat stresse4
- Outcome
- chlorophyll contente4
- Direction
- lesse4
- Value
- 27.6%e4
- Comparator
- IR8e4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Rice (Oryza sativa L.) Genotypes”
e4“Heat stress resulted in significant reduction of chlorophyll content during early transplanting in both the genotypes though the reduction was less in ‘N22’ (27.6%) as compared to ‘IR8’ (45.2%)”
Claim · model-written summary
Chlorophyll reduction under heat stress was 45.2% in IR8, compared with N22.
- Taxon
- Rice (Oryza sativa L.)Oryza sativat0
- Material
- IR8e4
- Treatment
- Heat stresse4
- Outcome
- chlorophyll contente4
- Direction
- reductione4
- Value
- 45.2%e4
- Comparator
- N22e4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Rice (Oryza sativa L.) Genotypes”
e4“Heat stress resulted in significant reduction of chlorophyll content during early transplanting in both the genotypes though the reduction was less in ‘N22’ (27.6%) as compared to ‘IR8’ (45.2%)”
Claim · model-written summary
The increased and timely antioxidant response suggests a significant role in the heat tolerance of N22.
- Taxon
- Rice (Oryza sativa L.)Oryza sativat0
- Material
- N22e5
- Outcome
- development of tolerancee5
- Qualifier
- increased and timely response of antioxidant enzymese5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Rice (Oryza sativa L.) Genotypes”
e5“The increased and timely response of antioxidant enzymes along with the non enzymatic antioxidants is suggestive of their significant role in development of tolerance exhibited by the cultivar ‘N22’ under heat stress conditions”
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See all 43 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.