Abstract
The effects of hypoxia on the activities of some enzymes of antioxidative, non- enzymatic scavenging system, membrane permeability, lipid peroxidation, and some reactive oxygen species (ROS) in leaves of Zea mays were investigated. Samples were taken 48, 96, 144, and 192 h after the start of hypoxia treatment. A 192 h hypoxia treatment resulted in a significant rise in membrane permeability, lipid peroxidation (malondialdehyde level), and the production of hydrogen peroxide (H_2O_2) and superoxide (O_2^-) in maize leaves. A short duration of hypoxia enhanced the activity of superoxide dismutase (SOD; EC 1.15.1.1), catalase (CAT; EC 1.11.1.6), ascorbate peroxidase (APX; EC 1.11.1.11), and glutathione reductase (GR; EC 1.6.4.2), while further hypoxia significantly decreased the enzyme activity but increased the content of reduced glutathione (GSH) and ascorbic acid (AsA). It was observed that the reduction in SOD activity was greater than that in GR and APX (H_2O_2 scavengers). Our results showed that O_2^- induced membrane damage and lipid peroxidation, and that excessive accumulation of O_2^- is due to the reduced activity of SOD under hypoxia.
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Claims 9
Claim · model-written summary
After 192 h hypoxia, maize leaf membrane permeability and lipid peroxidation rose significantly.
- Organ / stage
- leavese0
- Treatment
- 192 h hypoxia treatmente0
- Outcome
- membrane permeability, lipid peroxidation (malondialdehyde level)e0
- Direction
- risee0
Zea maysNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A 192 h hypoxia treatment resulted in a significant rise in membrane permeability, lipid peroxidation (malondialdehyde level), and the production of hydrogen peroxide (H_2O_2) and superoxide (O_2^-) in maize leaves”
Claim · model-written summary
After 192 h hypoxia, maize leaf hydrogen peroxide and superoxide production rose significantly.
- Organ / stage
- leavese0
- Treatment
- 192 h hypoxia treatmente0
- Outcome
- production of hydrogen peroxide (H_2O_2) and superoxide (O_2^-)e0
- Direction
- risee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A 192 h hypoxia treatment resulted in a significant rise in membrane permeability, lipid peroxidation (malondialdehyde level), and the production of hydrogen peroxide (H_2O_2) and superoxide (O_2^-) in maize leaves”
Claim · model-written summary
Short hypoxia enhanced SOD, CAT and APX activities.
- Treatment
- short duration of hypoxiae0
- Outcome
- activity of superoxide dismutase (SOD; EC 1.15.1.1), catalase (CAT; EC 1.11.1.6), ascorbate peroxidase (APX; EC 1.11.1.11)e0
- Direction
- enhancede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A short duration of hypoxia enhanced the activity of superoxide dismutase (SOD; EC 1.15.1.1), catalase (CAT; EC 1.11.1.6), ascorbate peroxidase (APX; EC 1.11.1.11), and glutathione reductase (GR; EC 1.6.4.2)”
t0“Zea mays Leaves”
Claim · model-written summary
Short hypoxia enhanced glutathione reductase activity.
- Treatment
- short duration of hypoxiae0
- Outcome
- glutathione reductase (GR; EC 1.6.4.2)e0
- Direction
- enhancede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A short duration of hypoxia enhanced the activity of superoxide dismutase (SOD; EC 1.15.1.1), catalase (CAT; EC 1.11.1.6), ascorbate peroxidase (APX; EC 1.11.1.11), and glutathione reductase (GR; EC 1.6.4.2)”
t0“Zea mays Leaves”
Claim · model-written summary
Further hypoxia significantly decreased antioxidant enzyme activity.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“further hypoxia significantly decreased the enzyme activity but increased the content of reduced glutathione (GSH) and ascorbic acid (AsA)”
t0“Zea mays Leaves”
Claim · model-written summary
Further hypoxia increased reduced glutathione and ascorbic acid content.
- Treatment
- further hypoxiae0
- Outcome
- content of reduced glutathione (GSH) and ascorbic acid (AsA)e0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“further hypoxia significantly decreased the enzyme activity but increased the content of reduced glutathione (GSH) and ascorbic acid (AsA)”
t0“Zea mays Leaves”
Claim · model-written summary
SOD activity declined more than GR and APX activity.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the reduction in SOD activity was greater than that in GR and APX (H_2O_2 scavengers)”
t0“Zea mays Leaves”
Claim · model-written summary
The authors attribute membrane damage and lipid peroxidation to superoxide.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“O_2^- induced membrane damage and lipid peroxidation”
t0“Zea mays Leaves”
Claim · model-written summary
The authors attribute superoxide accumulation under hypoxia to reduced SOD activity.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“excessive accumulation of O_2^- is due to the reduced activity of SOD under hypoxia”
t0“Zea mays Leaves”
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