Abstract
Drought stress is a major factor limiting crop growth and yield. Hydrogen peroxide (H2O2) is known as a signalling molecule in the plant cell in which activates multiple physiological changes that play essential roles in tolerance mechanism. This study investigated the effects of seed priming with H2O2 on growth, some physiological characteristics and antioxidant enzyme activities in rice seedling under drought stress. Rice (Oryza sativa L.) cv. Khao Dawk Mali 105 seeds were primed with 0 (distilled water), 1, 5, 10, and 15 mM H2O2 and grown for 21 days. The seedlings were subjected to drought stress by withholding water for 7 days. The results showed that priming with low concentrations of H2O2 improved plant growth and biomass as well as relative water content, malondialdehyde content, electrolyte leakage. Priming with H2O2, however, had no beneficial effect on chlorophyll content, proline and leaf total soluble sugar. Seed priming with appropriate levels of H2O2 also enhanced antioxidant enzyme activities including superoxide dismutase (SOD), catalase (CAT), ascorbate peroxidase (APX), and guaiacol peroxidase (GPX). It is concluded that seed priming with 2-10 mM H2O2, is beneficial for enhancing drought tolerance in rice seedling by increasing antioxidant capacity, which in turn reduces oxidative stress and damages to the cellular components.
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Claims 6
Claim · model-written summary
Low H2O2 priming improved seedling growth and biomass.
- Taxon
- rice
Oryza sativat0 - Treatment
- low concentrations of H2O2e0
- Outcome
- plant growth and biomasse0
- Direction
- improvede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“priming with low concentrations of H2O2 improved plant growth and biomass”
t0“rice (Oryza sativa L.)”
Claim · model-written summary
Low H2O2 priming improved relative water content.
- Taxon
- riceOryza sativat0
- Treatment
- low concentrations of H2O2e0
- Outcome
- relative water contente0
- Direction
- improvede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“priming with low concentrations of H2O2 improved plant growth and biomass as well as relative water content, malondialdehyde content, electrolyte leakage.”
t0“rice (Oryza sativa L.)”
Claim · model-written summary
Low H2O2 priming improved malondialdehyde content and electrolyte leakage.
- Taxon
- riceOryza sativat0
- Treatment
- low concentrations of H2O2e0
- Outcome
- malondialdehyde content, electrolyte leakagee0
- Direction
- improvede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“priming with low concentrations of H2O2 improved plant growth and biomass as well as relative water content, malondialdehyde content, electrolyte leakage.”
t0“rice (Oryza sativa L.)”
Claim · model-written summary
Priming had no beneficial effect on chlorophyll content, proline, or soluble sugar.
- Taxon
- riceOryza sativat0
- Treatment
- H2O2e0
- Outcome
- chlorophyll content, proline and leaf total soluble sugare0
- Direction
- no beneficial effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Priming with H2O2, however, had no beneficial effect on chlorophyll content, proline and leaf total soluble sugar.”
t0“rice (Oryza sativa L.)”
Claim · model-written summary
Appropriate H2O2 priming enhanced four antioxidant enzyme activities.
- Taxon
- riceOryza sativat0
- Treatment
- appropriate levels of H2O2e0
- Gene
- superoxide dismutase (SOD), catalase (CAT), ascorbate peroxidase (APX), and guaiacol peroxidase (GPX)e0
- Outcome
- antioxidant enzyme activitiese0
- Direction
- enhancede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Seed priming with appropriate levels of H2O2 also enhanced antioxidant enzyme activities including superoxide dismutase (SOD), catalase (CAT), ascorbate peroxidase (APX), and guaiacol peroxidase (GPX).”
t0“rice (Oryza sativa L.)”
Claim · model-written summary
The authors conclude 2-10 mM H2O2 priming improves drought tolerance via antioxidant capacity.
- Taxon
- riceOryza sativae0
- Treatment
- 2-10 mM H2O2e0
- Outcome
- drought tolerancee0
- Qualifier
- increasing antioxidant capacitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“seed priming with 2-10 mM H2O2, is beneficial for enhancing drought tolerance in rice seedling by increasing antioxidant capacity, which in turn reduces oxidative stress and damages to the cellular components.”
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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.