Abstract
Physiological responses of Oryza sativa L. to lead excess (10 and 50 μM) were studied in a hydroponic system after 48- and 96-h exposure. Accumulation of Pb in stressed rice shoots was concomitant with an increased metal concentration in the growth media and duration of exposure. The Pb stress resulted in an enhanced lipid peroxidation accompanied by altered activities of antioxidants. A substantial increase in α-tocopherol content of the Pb stressed rice shoots was observed suggesting its important role as an antioxidant. Among the antioxidant enzymes studied, activities of superoxide dismutase (SOD) and ascorbate peroxidase (APX) increased in the Pb-treated rice shoots, whereas that of catalase (CAT) declined. Activity of an important ascorbate-glutathione cycle enzyme, glutathione reductase (GR), also increased significantly in the Pb-treated shoots. The results suggest that Pb toxicity resulted in induction of oxidative stress in rice shoots, and α-tocopherol accumulation and upregulation of SOD, APX, and GR activities play an effective role in acclimatization to Pb stress.
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Claims 7
Claim · model-written summary
Rice shoot Pb accumulation increased with media concentration and exposure duration.
- Taxon
- rice
Oryza sativae0 - Organ / stage
- shootse0
- Outcome
- Accumulation of Pb in stressed rice shootse0
- Direction
- increasede0
- Setting
- growth mediae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Accumulation of Pb in stressed rice shoots was concomitant with an increased metal concentration in the growth media and duration of exposure.”
Claim · model-written summary
Pb stress enhanced lipid peroxidation.
- Taxon
- riceOryza sativat0
- Treatment
- Pb stresse0
- Outcome
- lipid peroxidatione0
- Direction
- enhancede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The Pb stress resulted in an enhanced lipid peroxidation accompanied by altered activities of antioxidants.”
t0“Lead induced oxidative stress and alteration in the activities of antioxidative enzymes in rice shoots”
Claim · model-written summary
Pb stress altered antioxidant activities.
- Taxon
- riceOryza sativat0
- Treatment
- Pb stresse0
- Outcome
- activities of antioxidantse0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The Pb stress resulted in an enhanced lipid peroxidation accompanied by altered activities of antioxidants.”
t0“Lead induced oxidative stress and alteration in the activities of antioxidative enzymes in rice shoots”
Claim · model-written summary
Pb-stressed rice shoots had substantially increased α-tocopherol content.
- Taxon
- riceOryza sativae0
- Organ / stage
- shootse0
- Treatment
- Pbe0
- Outcome
- α-tocopherol contente0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A substantial increase in α-tocopherol content of the Pb stressed rice shoots was observed”
Claim · model-written summary
Pb-treated rice shoots had increased SOD and APX activities.
- Taxon
- riceOryza sativae0
- Organ / stage
- shootse0
- Treatment
- Pb-treatede0
- Outcome
- activities of superoxide dismutase (SOD) and ascorbate peroxidase (APX)e0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“activities of superoxide dismutase (SOD) and ascorbate peroxidase (APX) increased in the Pb-treated rice shoots”
Claim · model-written summary
Catalase activity declined in Pb-treated rice shoots.
- Taxon
- riceOryza sativat0
- Treatment
- Pbe0
- Outcome
- catalase (CAT)e0
- Direction
- declinede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in the Pb-treated rice shoots, whereas that of catalase (CAT) declined.”
t0“Lead induced oxidative stress and alteration in the activities of antioxidative enzymes in rice shoots”
Claim · model-written summary
Glutathione reductase activity increased significantly in Pb-treated shoots.
- Taxon
- riceOryza sativat0
- Organ / stage
- shootse0
- Treatment
- Pb-treatede0
- Outcome
- glutathione reductase (GR)e0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Activity of an important ascorbate-glutathione cycle enzyme, glutathione reductase (GR), also increased significantly in the Pb-treated shoots.”
t0“Lead induced oxidative stress and alteration in the activities of antioxidative enzymes in rice shoots”
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See all 37 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.