Abstract
In an effort to determine the biochemical markers for identifying genotypes before sowing for drought tolerance, changes in activities of antioxidant enzymes were determined in the seedlings of five drought-tolerant and five drought-sensitive wheat (Triticum aestivum L.) genotypes, each with different genetic background growing under normal and water deficit conditions induced by 6% mannitol. In comparison with non-stressed seedlings, the catalase (CAT) activity was upregulated by more than 50% in the roots of water-stressed seedlings in drought-tolerant genotypes. Water deficit stress also led to the upregulation of ascorbate peroxidase (APX) in the endosperms and glutathione reductase (GR), CAT and peroxidase (POD) in the shoots of stressed seedlings in drought-tolerant genotypes. Superoxide dismutase (SOD) activity was very low in roots and shoots and showed non-significant increase under water-stress in tolerant genotypes. Out of five specified enzyme activities (CAT in roots and shoots, APX in endosperms, GR and POD in shoots), if any three are upregulated in the specified tissues under water deficit conditions, the genotype is likely to be drought-tolerant. Wheat seedlings with low GR and APX activities and high POD activity in shoots with a low ratio of GR activity of shoot to root of non-stressed seedlings are likely to perform better under rainfed conditions. The observed data showed that status of antioxidant enzymes could provide a meaningful tool for depicting drought tolerance of a wheat genotype.
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Claims 8
Claim · model-written summary
Water stress increased root catalase activity by more than 50% in tolerant genotypes.
- Taxon
- wheat (Triticum aestivum L.)
Triticum aestivumt0 - Material
- drought-tolerant genotypese0
- Organ / stage
- rootse0
- Treatment
- water-stressed seedlingse0
- Gene
- catalase (CAT)e0
- Outcome
- catalase (CAT) activitye0
- Direction
- upregulatede0
- Value
- more than 50%e0
- Comparator
- non-stressed seedlingse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“wheat (Triticum aestivum L.)”
e0“In comparison with non-stressed seedlings, the catalase (CAT) activity was upregulated by more than 50% in the roots of water-stressed seedlings in drought-tolerant genotypes.”
Claim · model-written summary
Water deficit upregulated APX in endosperms of tolerant genotypes.
- Taxon
- wheat (Triticum aestivum L.)Triticum aestivumt0
- Organ / stage
- endospermse0
- Treatment
- Water deficit stresse0
- Gene
- ascorbate peroxidase (APX)e0
- Outcome
- ascorbate peroxidase (APX)e0
- Direction
- upregulatione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“wheat (Triticum aestivum L.)”
e0“Water deficit stress also led to the upregulation of ascorbate peroxidase (APX) in the endosperms and glutathione reductase (GR), CAT and peroxidase (POD) in the shoots of stressed seedlings in drought-tolerant genotypes.”
Claim · model-written summary
Water deficit upregulated GR, CAT and POD in shoots of tolerant genotypes.
- Taxon
- wheat (Triticum aestivum L.)Triticum aestivumt0
- Organ / stage
- shootse0
- Treatment
- Water deficit stresse0
- Outcome
- glutathione reductase (GR), CAT and peroxidase (POD)e0
- Direction
- upregulatione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“wheat (Triticum aestivum L.)”
e0“Water deficit stress also led to the upregulation of ascorbate peroxidase (APX) in the endosperms and glutathione reductase (GR), CAT and peroxidase (POD) in the shoots of stressed seedlings in drought-tolerant genotypes.”
Claim · model-written summary
SOD activity was very low in roots and shoots.
- Taxon
- wheat (Triticum aestivum L.)Triticum aestivumt0
- Organ / stage
- roots and shootse0
- Gene
- Superoxide dismutase (SOD)e0
- Outcome
- Superoxide dismutase (SOD) activitye0
- Direction
- very lowe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“wheat (Triticum aestivum L.)”
e0“Superoxide dismutase (SOD) activity was very low in roots and shoots”
Claim · model-written summary
SOD activity increased nonsignificantly under water stress in tolerant genotypes.
- Taxon
- wheat (Triticum aestivum L.)Triticum aestivumt0
- Material
- tolerant genotypese0
- Treatment
- water-stresse0
- Outcome
- Superoxide dismutase (SOD) activitye1
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“wheat (Triticum aestivum L.)”
e0“showed non-significant increase under water-stress in tolerant genotypes.”
e1“Superoxide dismutase (SOD) activity was very low in roots and shoots”
Claim · model-written summary
Upregulation of any three of five specified enzyme activities predicts drought tolerance.
- Taxon
- wheat (Triticum aestivum L.)Triticum aestivumt0
- Gene
- CAT in roots and shoots, APX in endosperms, GR and POD in shootse0
- Outcome
- drought-tolerante0
- Qualifier
- if any three are upregulatede0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“wheat (Triticum aestivum L.)”
e0“Out of five specified enzyme activities (CAT in roots and shoots, APX in endosperms, GR and POD in shoots), if any three are upregulated in the specified tissues under water deficit conditions, the genotype is likely to be drought-tolerant.”
Claim · model-written summary
Low GR and APX, high POD and a low shoot-to-root GR ratio in unstressed seedlings predict better rainfed performance.
- Taxon
- wheat (Triticum aestivum L.)Triticum aestivumt0
- Gene
- GR and APXe0
- Outcome
- perform better under rainfed conditionse0
- Direction
- bettere0
- Qualifier
- low ratio of GR activity of shoot to roote0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“wheat (Triticum aestivum L.)”
e0“Wheat seedlings with low GR and APX activities and high POD activity in shoots with a low ratio of GR activity of shoot to root of non-stressed seedlings are likely to perform better under rainfed conditions.”
Claim · model-written summary
Antioxidant enzyme status may serve as a tool for depicting wheat drought tolerance.
- Taxon
- wheat (Triticum aestivum L.)Triticum aestivumt0
- Outcome
- depicting drought tolerancee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“wheat (Triticum aestivum L.)”
e0“status of antioxidant enzymes could provide a meaningful tool for depicting drought tolerance of a wheat genotype.”
The same questions in other papers
drought · physiology: antioxidant enzymes · Triticum aestivum (wheat)Positive and negative results
48 papers in the same direction as this paper · 30 in the opposite direction
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- positive
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75 papers more in this group
See all 79 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.