Abstract
Drought is an important environmental constraint limiting the productivity of many crops worldwide. Seedling tolerance to drought is crucial for crop growth and development through the whole season under water-limited condition. Experiments were conducted to investigate the effects of seed pretreatment by hydrogen peroxide (H2O2) on drought tolerance in wheat (Triticum aestivum L.) seedlings. H2O2-pretreated seeds exhibited 56% higher in germination rate than the water-pretreated seeds (control) under PGE-induced drought condition. Level of H2O2 in seedlings arising from H2O2-treated seeds grown under drought stress was markedly lower than the controls, indicating the operation of antioxidant system in them. These seedlings exhibited increased growth characteristics including higher net photosynthetic rate, leaf area and dry weight. Moreover, H2O2 treatment improved water use efficiency (WUE) and proline level. H2O2 pretreatment enhanced the membrane stability, as revealed from greatly reduced membrane damage rate (MDA) and malondialdehyde (MDA) content. The seedlings showed the higher expression of antioxidative enzyme such as catalase (CAT) and ascorbate peroxidase (APX). The present data suggest that H2O2, a stress signal, could trigger the activation of antioxidants in seeds, which persists in the seedlings to alleviate the oxidative damage, leading to improvements in physiological attributes for the seedling growth under drought. Key words: wheat (Triticum aestivum L.), seed pretreatment, H2O2, signaling, drought tolerance, membrane permeability, antioxidative system.
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Claims 8
Claim · model-written summary
H2O2 pretreatment raised germination rate 56% over water pretreatment under drought.
- Taxon
- wheat
Triticum aestivumt0 - Treatment
- H2O2-pretreated seedse0
- Outcome
- germination ratee0
- Direction
- highere0
- Value
- 56%e0
- Qualifier
- PGE-induced drought conditione0
- Comparator
- water-pretreated seedse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“H2O2-pretreated seeds exhibited 56% higher in germination rate than the water-pretreated seeds (control) under PGE-induced drought condition.”
t0“wheat”
Claim · model-written summary
Seedling H2O2 level was lower after H2O2 seed treatment under drought.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- H2O2-treated seedse0
- Outcome
- Level of H2O2 in seedlingse0
- Direction
- lowere0
- Qualifier
- drought stresse0
- Comparator
- controlse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Level of H2O2 in seedlings arising from H2O2-treated seeds grown under drought stress was markedly lower than the controls”
t0“wheat”
Claim · model-written summary
Treated seedlings had higher net photosynthetic rate, leaf area and dry weight.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- H2O2t0
- Outcome
- net photosynthetic rate, leaf area and dry weighte0
- Direction
- highere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“These seedlings exhibited increased growth characteristics including higher net photosynthetic rate, leaf area and dry weight.”
t0“H2O2 enhances drought tolerance of wheat”
Claim · model-written summary
H2O2 treatment improved water use efficiency and proline level.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- H2O2 treatmente0
- Outcome
- water use efficiency (WUE) and proline levele0
- Direction
- improvede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Moreover, H2O2 treatment improved water use efficiency (WUE) and proline level.”
t0“wheat”
Claim · model-written summary
H2O2 pretreatment enhanced membrane stability.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- H2O2 pretreatmente0
- Outcome
- membrane stabilitye0
- Direction
- enhancede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“H2O2 pretreatment enhanced the membrane stability, as revealed from greatly reduced membrane damage rate (MDA) and malondialdehyde (MDA) content.”
t0“wheat”
Claim · model-written summary
H2O2 pretreatment reduced membrane damage rate and malondialdehyde content.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- H2O2 pretreatmente0
- Outcome
- membrane damage rate (MDA) and malondialdehyde (MDA) contente0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“H2O2 pretreatment enhanced the membrane stability, as revealed from greatly reduced membrane damage rate (MDA) and malondialdehyde (MDA) content.”
t0“wheat”
Claim · model-written summary
Treated seedlings had higher catalase and ascorbate peroxidase expression.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- H2O2t0
- Gene
- catalase (CAT) and ascorbate peroxidase (APX)e0
- Outcome
- expression of antioxidative enzymee0
- Direction
- highere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The seedlings showed the higher expression of antioxidative enzyme such as catalase (CAT) and ascorbate peroxidase (APX).”
t0“H2O2 enhances drought tolerance of wheat”
Claim · model-written summary
The authors suggest H2O2 triggers persistent antioxidant activation that alleviates oxidative damage under drought.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- H2O2e0
- Outcome
- alleviate the oxidative damagee0
- Qualifier
- could trigger the activation of antioxidants in seedse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The present data suggest that H2O2, a stress signal, could trigger the activation of antioxidants in seeds, which persists in the seedlings to alleviate the oxidative damage, leading to improvements in physiological attributes for the seedling growth under drought.”
t0“wheat”
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