Abstract
Wheat ( Triticum aestivum L.) seedlings of a drought‐resistant cv. C306 were subjected to severe water deficit directly or through stress cycles of increasing intensity with intermittent recovery periods (drought acclimation). The antioxidant defense in terms of redox metabolites and enzymes in leaf cells, chloroplasts, and mitochondria was examined in relation to ROS‐induced membrane damage. Drought‐acclimated seedlings modulated growth by maintaining favorable turgor potential and RWC and were able to limit H 2 O 2 accumulation and membrane damage as compared with non‐acclimated plants during severe water stress conditions. This was due to systematic upregulation of H 2 O 2 ‐metabolizing enzymes especially ascorbate peroxidase (APX, EC 1.11.1.11) and by maintaining ascorbate–glutathione redox pool in acclimated plants. By contrast, failure in the induction of APX and ascorbate–glutathione cycle enzymes makes the chloroplast susceptible to oxidative stress in non‐acclimated plants. Non‐acclimated plants protected the leaf mitochondria from oxidative stress by upregulating superoxide dismutase (SOD, EC 1.15.1.1), APX, and glutathione reductase (GR, EC 1.6.4.2) activities. Rewatering led to rapid enhancement in all the antioxidant defense components in non‐acclimated plants, which suggested that the excess levels of H 2 O 2 during severe water stress conditions might have inhibited or downregulated the antioxidant enzymes. Hence, drought acclimation conferred enhanced oxidative stress tolerance by well‐co‐ordinated induction of antioxidant defense both at the chloroplast and at the mitochondrial level.
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Claims 6
Claim · model-written summary
Drought acclimation maintained favorable turgor potential and RWC during severe water stress.
- Taxon
- wheat seedlings
Triticum aestivumt0 - Treatment
- Drought‐acclimatede0
- Outcome
- turgor potential and RWCe0
- Direction
- maintaininge0
- Qualifier
- severe water stress conditionse0
- Comparator
- non‐acclimated plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Drought‐acclimated seedlings modulated growth by maintaining favorable turgor potential and RWC and were able to limit H 2 O 2 accumulation and membrane damage as compared with non‐acclimated plants during severe water stress conditions.”
t0“wheat seedlings”
Claim · model-written summary
Drought acclimation limited hydrogen peroxide accumulation and membrane damage relative to nonacclimated plants.
- Taxon
- wheat seedlingsTriticum aestivumt0
- Treatment
- Drought‐acclimatede0
- Outcome
- H 2 O 2 accumulation and membrane damagee0
- Direction
- limite0
- Comparator
- non‐acclimated plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Drought‐acclimated seedlings modulated growth by maintaining favorable turgor potential and RWC and were able to limit H 2 O 2 accumulation and membrane damage as compared with non‐acclimated plants during severe water stress conditions.”
t0“wheat seedlings”
Claim · model-written summary
Acclimated plants upregulated hydrogen peroxide metabolizing enzymes, especially APX, and maintained the ascorbate–glutathione redox pool.
- Taxon
- wheat seedlingsTriticum aestivumt0
- Gene
- ascorbate peroxidasee0
- Outcome
- H 2 O 2 ‐metabolizing enzymese0
- Qualifier
- maintaining ascorbate–glutathione redox poole0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“systematic upregulation of H 2 O 2 ‐metabolizing enzymes especially ascorbate peroxidase (APX, EC 1.11.1.11) and by maintaining ascorbate–glutathione redox pool in acclimated plants”
t0“wheat seedlings”
Claim · model-written summary
Nonacclimated chloroplasts were susceptible to oxidative stress when APX and ascorbate–glutathione cycle enzymes were not induced.
- Taxon
- wheat seedlingsTriticum aestivumt0
- Organ / stage
- chloroplaste0
- Gene
- APXe0
- Outcome
- chloroplast susceptible to oxidative stresse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“failure in the induction of APX and ascorbate–glutathione cycle enzymes makes the chloroplast susceptible to oxidative stress in non‐acclimated plants”
t0“wheat seedlings”
Claim · model-written summary
Nonacclimated plants protected mitochondria by upregulating SOD, APX, and GR activities.
- Taxon
- wheat seedlingsTriticum aestivumt0
- Organ / stage
- leaf mitochondriae0
- Gene
- superoxide dismutasee0
- Outcome
- leaf mitochondria from oxidative stresse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Non‐acclimated plants protected the leaf mitochondria from oxidative stress by upregulating superoxide dismutase (SOD, EC 1.15.1.1), APX, and glutathione reductase (GR, EC 1.6.4.2) activities.”
t0“wheat seedlings”
Claim · model-written summary
Rewatering rapidly enhanced antioxidant defense components in nonacclimated plants.
- Taxon
- wheat seedlingsTriticum aestivumt0
- Treatment
- Rewateringe0
- Outcome
- antioxidant defense componentse0
- Direction
- enhancemente0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rewatering led to rapid enhancement in all the antioxidant defense components in non‐acclimated plants”
t0“wheat seedlings”
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