Abstract
Ascorbate (AsA)-glutathione (GSH) cycle metabolism is an essential mechanism for the resistance of plants under stress conditions. In a greenhouse pot experiment, the influence of cadmium (Cd) (25, 50, and 100 mg/kg soil) on plant dry weight and leaf area, photosynthetic parameters (net photosynthetic rate (P N ) and chlorophyll (Chl) content) and oxidative stress, and the possible protective role of AsA-GSH cycle metabolism was studied in two mung bean ( Vigna radiata (L.) Wilczek.) cvs. Pusa 9531 (Cd-tolerant) and PS 16 (Cd-susceptible) at 30 days after sowing. The contents of thiobarbituric acid-reactive substances (TBARS), H 2 O 2 , and the leakage of ions were the highest at 100 mg Cd/kg soil, and the effect was more pronounced in cv. PS 16 than in cv. Pusa 9531. This was concomitant with the strongest decreases in P N , plant dry weight, and leaf area. The changes in the AsA-GSH redox state and an increase in AsA-GSH-regenerating enzymes, such as glutathione reductase, monodehydroascorbate reductase, dehydroascorbate reductase, and other antioxidant enzymes, such as superoxide dismutase and ascorbate peroxidase, strongly supported over-utilization of AsA-GSH in Cd-treated plants. However, the oxidative stress caused by Cd toxicity was partially overcome by AsA-GSH-based detoxification mechanism in the two genotypes studied because an increases in lipid peroxidation (TBARS, ion leakage) and H 2 O 2 content were accompanied by a corresponding decrease in reduced AsA and GSH pools. Thus, changes in AsA-GSH pools and the coordination between AsA-GSH-regenerating enzymes and other enzymatic antioxidants of the leaves suggest their relevance to the defense against Cd stress.
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Claims 7
Claim · model-written summary
Cd at 100 mg/kg soil gave the highest TBARS, H2O2 and ion leakage in mung bean.
- Taxon
- mung bean
.jpg?width=60)
Vigna radiatat0 - Treatment
- 100 mg Cd/kg soile1
- Outcome
- contents of thiobarbituric acid-reactive substances (TBARS), H 2 O 2 , and the leakage of ionse1
- Direction
- higheste1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
t0“mung bean”
e1“The contents of thiobarbituric acid-reactive substances (TBARS), H 2 O 2 , and the leakage of ions were the highest at 100 mg Cd/kg soil”
Claim · model-written summary
Cd at 100 mg/kg soil produced the strongest decreases in photosynthetic rate, plant dry weight and leaf area of mung bean.
- Taxon
- mung beanVigna radiatat0
- Treatment
- 100 mg Cd/kg soile2
- Outcome
- P N , plant dry weight, and leaf areae1
- Direction
- strongest decreasese1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“mung bean”
e1“This was concomitant with the strongest decreases in P N , plant dry weight, and leaf area”
e2“The contents of thiobarbituric acid-reactive substances (TBARS), H 2 O 2 , and the leakage of ions were the highest at 100 mg Cd/kg soil”
Claim · model-written summary
Cd-treated mung bean showed increased AsA-GSH-regenerating enzymes, including glutathione reductase, monodehydroascorbate reductase and dehydroascorbate reductase.
- Taxon
- mung beanVigna radiatat0
- Treatment
- Cd-treatede2
- Gene
- glutathione reductase, monodehydroascorbate reductase, dehydroascorbate reductasee1
- Outcome
- AsA-GSH-regenerating enzymese1
- Direction
- increasee1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“mung bean”
e1“an increase in AsA-GSH-regenerating enzymes, such as glutathione reductase, monodehydroascorbate reductase, dehydroascorbate reductase”
e2“strongly supported over-utilization of AsA-GSH in Cd-treated plants”
Claim · model-written summary
Cd-treated mung bean showed increased superoxide dismutase and ascorbate peroxidase among other antioxidant enzymes.
- Taxon
- mung beanVigna radiatat0
- Treatment
- Cd-treatede2
- Gene
- superoxide dismutase and ascorbate peroxidasee1
- Outcome
- other antioxidant enzymese1
- Direction
- increasee1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“mung bean”
e1“an increase in AsA-GSH-regenerating enzymes, such as glutathione reductase, monodehydroascorbate reductase, dehydroascorbate reductase, and other antioxidant enzymes, such as superoxide dismutase and ascorbate peroxidase”
e2“strongly supported over-utilization of AsA-GSH in Cd-treated plants”
Claim · model-written summary
Changes in the AsA-GSH redox state supported over-utilization of AsA-GSH under Cd treatment.
- Taxon
- mung beanVigna radiatat0
- Treatment
- Cd-treatede1
- Compound
- AsA-GSHe1
- Outcome
- over-utilization of AsA-GSHe1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“mung bean”
e1“strongly supported over-utilization of AsA-GSH in Cd-treated plants”
Claim · model-written summary
Increased lipid peroxidation and H2O2 accompanied a decrease in reduced AsA and GSH pools under Cd toxicity.
- Taxon
- mung beanVigna radiatat0
- Treatment
- Cd toxicitye2
- Outcome
- reduced AsA and GSH poolse1
- Direction
- decreasee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“mung bean”
e1“increases in lipid peroxidation (TBARS, ion leakage) and H 2 O 2 content were accompanied by a corresponding decrease in reduced AsA and GSH pools”
e2“the oxidative stress caused by Cd toxicity was partially overcome”
Claim · model-written summary
The Cd effect was more pronounced in cv. PS 16 than in cv. Pusa 9531.
- Taxon
- mung beanVigna radiatat0
- Material
- cv. PS 16e1
- Outcome
- effecte1
- Direction
- more pronouncede1
- Comparator
- cv. Pusa 9531e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“mung bean”
e1“the effect was more pronounced in cv. PS 16 than in cv. Pusa 9531”
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See all 9 papers →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.