Abstract
An experiment was conducted on five wheat ( Triticum aestivum L.) cultivars, C 306, PBW 175 (tolerant to water stress), DL 153‐2 (moderately tolerant to water stress), HD 2428 and HD 2329 (recommended for irrigated conditions, susceptible to water stress), under pot culture conditions to study the effect of water stress on oxidative injury and antioxidant activity. Water stress significantly decreased relative water content (RWC), ascorbic acid content and membrane stability, and increased hydrogen peroxide and malondialdehyde content, a measure of lipid peroxidation, and activities of antioxidant enzymes in all the genotypes at 7, 17 and 27 days after anthesis (DAA). Water stress tolerant genotypes C 306 and PBW 175, closely followed by DL 153‐2, were superior to HD 2428 and HD 2329 in maintaining high RWC, ascorbic acid content and membrane stability and lower hydrogen peroxide content and lipid peroxidation (malondialdehyde content) under water stress at the three stages. The highest activities of glutathione reductase and catalase under water stress were observed in C 306, PBW 175 and DL 153‐2 and the lowest activities in HD 2428 and HD 2329 at all the stages. Superoxide dismutase activity at all stages under irrigated conditions and at the first and second stages under water stress conditions did not show significant variation among the different genotypes, but at the last stage under water stress the enzyme activity was highest in C 306, closely followed by PBW 175 and DL 153‐2, and lowest in HD 2428 and HD 2329. It is apparent that water stress induces an increase in hydrogen peroxide content and consequently lipid peroxidation and membrane injury (reduced membrane stability). The degree of oxidative stress and antioxidant activity seems to be closely associated with the tolerance/susceptibility of a genotype to water stress.
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Claims 9
Claim · model-written summary
Water stress lowered relative water content, ascorbic acid and membrane stability.
- Taxon
- wheat
Triticum aestivumt0 - Treatment
- Water stresse0
- Outcome
- relative water content (RWC), ascorbic acid content and membrane stabilitye0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Water stress significantly decreased relative water content (RWC), ascorbic acid content and membrane stability”
t0“wheat”
Claim · model-written summary
Water stress increased hydrogen peroxide and malondialdehyde content.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- Water Stresst0
- Outcome
- hydrogen peroxide and malondialdehyde contente0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increased hydrogen peroxide and malondialdehyde content, a measure of lipid peroxidation”
t0“Water Stress Tolerance of Wheat (Triticum aestivum L.)”
Claim · model-written summary
Water stress increased antioxidant enzyme activities.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- Water Stresst0
- Outcome
- activities of antioxidant enzymese0
- Direction
- increasede0
- Qualifier
- 7, 17 and 27 days after anthesis (DAA)e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increased hydrogen peroxide and malondialdehyde content, a measure of lipid peroxidation, and activities of antioxidant enzymes in all the genotypes at 7, 17 and 27 days after anthesis (DAA)”
t0“Water Stress Tolerance of Wheat (Triticum aestivum L.)”
Claim · model-written summary
Tolerant cultivars better maintained water content, ascorbic acid and membrane stability.
- Taxon
- wheatTriticum aestivumt0
- Material
- C 306 and PBW 175e0
- Outcome
- RWC, ascorbic acid content and membrane stabilitye0
- Direction
- highe0
- Comparator
- HD 2428 and HD 2329e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Water stress tolerant genotypes C 306 and PBW 175, closely followed by DL 153‐2, were superior to HD 2428 and HD 2329 in maintaining high RWC, ascorbic acid content and membrane stability”
t0“wheat”
Claim · model-written summary
Tolerant cultivars had lower hydrogen peroxide and lipid peroxidation.
- Taxon
- wheatTriticum aestivumt0
- Outcome
- hydrogen peroxide content and lipid peroxidation (malondialdehyde content)e0
- Direction
- lowere0
- Qualifier
- under water stress at the three stagese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“lower hydrogen peroxide content and lipid peroxidation (malondialdehyde content) under water stress at the three stages”
t0“wheat”
Claim · model-written summary
Glutathione reductase and catalase activities were highest in tolerant genotypes.
- Taxon
- wheatTriticum aestivumt0
- Material
- C 306, PBW 175 and DL 153‐2e0
- Gene
- glutathione reductase and catalasee0
- Outcome
- activities of glutathione reductase and catalasee0
- Direction
- higheste0
- Comparator
- HD 2428 and HD 2329e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The highest activities of glutathione reductase and catalase under water stress were observed in C 306, PBW 175 and DL 153‐2 and the lowest activities in HD 2428 and HD 2329 at all the stages”
t0“wheat”
Claim · model-written summary
Superoxide dismutase activity showed no significant genotype variation at early stages.
- Taxon
- wheatTriticum aestivumt0
- Gene
- Superoxide dismutasee0
- Outcome
- Superoxide dismutase activitye0
- Direction
- did not show significant variatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Superoxide dismutase activity at all stages under irrigated conditions and at the first and second stages under water stress conditions did not show significant variation among the different genotypes”
t0“wheat”
Claim · model-written summary
At the last water-stress stage, superoxide dismutase was highest in C 306.
- Taxon
- wheatTriticum aestivumt0
- Material
- C 306e0
- Outcome
- enzyme activitye0
- Direction
- higheste0
- Qualifier
- last stage under water stresse0
- Comparator
- HD 2428 and HD 2329e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“at the last stage under water stress the enzyme activity was highest in C 306, closely followed by PBW 175 and DL 153‐2, and lowest in HD 2428 and HD 2329”
t0“wheat”
Claim · model-written summary
Oxidative stress and antioxidant activity tracked genotype water-stress tolerance.
- Taxon
- wheatTriticum aestivumt0
- Material
- genotypee0
- Outcome
- degree of oxidative stress and antioxidant activitye0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The degree of oxidative stress and antioxidant activity seems to be closely associated with the tolerance/susceptibility of a genotype to water stress”
t0“wheat”
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