Abstract
Abstract Breeders are trying to develop true submergence-tolerant genotypes for lowland irrigated and/or rainfed areas, where rice is often affected by short-term submergence. This study was conducted to evaluate the submergence tolerance, response of antioxidative defense systems to hypoxic and re-aerated conditions, and growth and survival percentage among 19 rice genotypes. The rice seedlings submerged into concrete tanks for 10 days exhibited decreased activities of antioxidant enzymes. The antioxidant enzymes, superoxide dismutase, catalase, and ascorbate peroxidase increased, whereas polyphenol oxidase and glutathione reductase decreased in subsequent re-aerated situation in tolerant genotypes. On the other hand, the activities of enzymes decreased greatly in susceptible genotypes under hypoxic and re-aerated conditions. Complete submergence of the seedling increased the plant height of 12 genotypes. However, it decreased the dry matter production. Genotypes having better root and shoot growth maintained higher dry weight and exhibited better survival than did others. The results indicated that genotypes tolerant of flash flood maintained higher activities of antioxidant enzymes and dry matter accumulation to protect against postanoxic injury.
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Claims 9
Claim · model-written summary
Submergence of rice seedlings for 10 days decreased antioxidant enzyme activities.
- Taxon
- rice
Oryza sativat0 - Treatment
- submerged into concrete tanks for 10 dayse0
- Outcome
- activities of antioxidant enzymese0
- Direction
- decreasede0
- Setting
- concrete tankse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Indian rice cultivars”
e0“The rice seedlings submerged into concrete tanks for 10 days exhibited decreased activities of antioxidant enzymes”
Claim · model-written summary
Superoxide dismutase, catalase and ascorbate peroxidase increased in tolerant rice genotypes in the re-aerated situation.
- Taxon
- riceOryza sativat0
- Material
- tolerant genotypese1
- Treatment
- subsequent re-aerated situatione1
- Gene
- superoxide dismutase, catalase, and ascorbate peroxidasee1
- Outcome
- antioxidant enzymese1
- Direction
- increasede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Indian rice cultivars”
e1“The antioxidant enzymes, superoxide dismutase, catalase, and ascorbate peroxidase increased, whereas polyphenol oxidase and glutathione reductase decreased in subsequent re-aerated situation in tolerant genotypes”
Claim · model-written summary
Polyphenol oxidase and glutathione reductase decreased in the re-aerated situation of tolerant rice genotypes.
- Taxon
- riceOryza sativat0
- Material
- tolerant genotypese1
- Treatment
- subsequent re-aerated situatione1
- Gene
- polyphenol oxidase and glutathione reductasee1
- Outcome
- antioxidant enzymese1
- Direction
- decreasede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Indian rice cultivars”
e1“The antioxidant enzymes, superoxide dismutase, catalase, and ascorbate peroxidase increased, whereas polyphenol oxidase and glutathione reductase decreased in subsequent re-aerated situation in tolerant genotypes”
Claim · model-written summary
Enzyme activities decreased greatly in susceptible rice genotypes under hypoxic and re-aerated conditions.
- Taxon
- riceOryza sativat0
- Material
- susceptible genotypese2
- Treatment
- hypoxic and re-aerated conditionse2
- Outcome
- activities of enzymese2
- Direction
- decreased greatlye2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Indian rice cultivars”
e2“On the other hand, the activities of enzymes decreased greatly in susceptible genotypes under hypoxic and re-aerated conditions”
Claim · model-written summary
Complete submergence increased the plant height of 12 rice genotypes.
- Taxon
- riceOryza sativat0
- Material
- 12 genotypese3
- Treatment
- Complete submergencee3
- Outcome
- plant heighte3
- Direction
- increasede3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Indian rice cultivars”
e3“Complete submergence of the seedling increased the plant height of 12 genotypes. However, it decreased the dry matter production”
Claim · model-written summary
Complete submergence decreased dry matter production of rice.
- Taxon
- riceOryza sativat0
- Treatment
- Complete submergencee3
- Outcome
- dry matter productione3
- Direction
- decreasede3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Indian rice cultivars”
e3“Complete submergence of the seedling increased the plant height of 12 genotypes. However, it decreased the dry matter production”
Claim · model-written summary
Genotypes with better root and shoot growth had higher dry weight than others under submergence.
- Taxon
- riceOryza sativat0
- Material
- Genotypes having better root and shoot growthe4
- Outcome
- dry weighte4
- Direction
- highere4
- Comparator
- otherse4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Indian rice cultivars”
e4“Genotypes having better root and shoot growth maintained higher dry weight and exhibited better survival than did others”
Claim · model-written summary
Genotypes with better root and shoot growth had better survival than others.
- Taxon
- riceOryza sativat0
- Material
- Genotypes having better root and shoot growthe4
- Outcome
- survivale4
- Direction
- bettere4
- Comparator
- otherse4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Indian rice cultivars”
e4“Genotypes having better root and shoot growth maintained higher dry weight and exhibited better survival than did others”
Claim · model-written summary
Higher antioxidant enzyme activity in flash-flood-tolerant rice genotypes protects against postanoxic injury.
- Taxon
- riceOryza sativat0
- Material
- genotypes tolerant of flash floode5
- Outcome
- higher activities of antioxidant enzymese5
- Qualifier
- to protect against postanoxic injurye5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Indian rice cultivars”
e5“The results indicated that genotypes tolerant of flash flood maintained higher activities of antioxidant enzymes and dry matter accumulation to protect against postanoxic injury”
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See all 286 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.