Abstract
Oxidative stress was induced by lead acetate (Pb) in Raphanus sativus seedlings grown in a hydroponic system using sand as substrate. Thirty day old acclimated seeds were treated for 7 days with five Pb levels (0 as control, 100, 200, 500 and 1000 mg l-1). Parameters such as growth, oxidative damage markers (lipid peroxidation, protein oxidation and hydrogen peroxide contents) and enzymatic activities of catalase (CAT) and peroxidase (POD) were investigated. Lead concentration in plant tissues increased with increasing of Pb levels. Shoot fresh weight, chlorophyll and carotenoid concentration were significantly decreased at 100 mg l-1 Pb. Lipid peroxidation, protein oxidation and H2O2 levels were increased at 500 and 1000 mg l-1 Pb compared to control treatment, in shoots. Peroxidase activity showed a straight correlation with H2O2 concentration, whereas CAT activity decreased only in shoots. These changes in enzymatic and non-enzymatic antioxidants showed that the Pb exposition had a significant disturbance on Raphanus sativus plantlets and affect the biochemical and physiological processes.
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Claims 7
Claim · model-written summary
Plant tissue lead concentration rose with lead level.
- Taxon
- Raphanus sativus
Raphanus sativust0 - Treatment
- Pb levelse0
- Outcome
- Lead concentration in plant tissuese0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Lead concentration in plant tissues increased with increasing of Pb levels.”
t0“Radish (Raphanus sativus) Seedlings”
Claim · model-written summary
Shoot fresh weight fell significantly at 100 mg l-1 lead.
- Taxon
- Raphanus sativusRaphanus sativust0
- Treatment
- 100 mg l-1 Pbe0
- Outcome
- Shoot fresh weighte0
- Direction
- decreasede0
- Comparator
- 0 as controle1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Shoot fresh weight, chlorophyll and carotenoid concentration were significantly decreased at 100 mg l-1 Pb.”
e1“0 as control”
t0“Radish (Raphanus sativus) Seedlings”
Claim · model-written summary
Chlorophyll concentration fell significantly at 100 mg l-1 lead.
- Taxon
- Raphanus sativusRaphanus sativust0
- Treatment
- 100 mg l-1 Pbe0
- Outcome
- chlorophylle0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Shoot fresh weight, chlorophyll and carotenoid concentration were significantly decreased at 100 mg l-1 Pb.”
t0“Radish (Raphanus sativus) Seedlings”
Claim · model-written summary
Carotenoid concentration fell significantly at 100 mg l-1 lead.
- Taxon
- Raphanus sativusRaphanus sativust0
- Treatment
- 100 mg l-1 Pbe0
- Outcome
- carotenoid concentratione0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Shoot fresh weight, chlorophyll and carotenoid concentration were significantly decreased at 100 mg l-1 Pb.”
t0“Radish (Raphanus sativus) Seedlings”
Claim · model-written summary
Shoot lipid peroxidation, protein oxidation and H2O2 increased at 500 and 1000 mg l-1 lead relative to control.
- Taxon
- Raphanus sativusRaphanus sativust0
- Organ / stage
- shootse0
- Treatment
- 500 and 1000 mg l-1 Pbe0
- Outcome
- Lipid peroxidation, protein oxidation and H2O2 levelse0
- Direction
- increasede0
- Comparator
- control treatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Lipid peroxidation, protein oxidation and H2O2 levels were increased at 500 and 1000 mg l-1 Pb compared to control treatment, in shoots.”
t0“Radish (Raphanus sativus) Seedlings”
Claim · model-written summary
Peroxidase activity correlated directly with H2O2 concentration.
- Taxon
- Raphanus sativusRaphanus sativust0
- Compound
- H2O2e0
- Outcome
- Peroxidase activitye0
- Direction
- straight correlatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Peroxidase activity showed a straight correlation with H2O2 concentration, whereas CAT activity decreased only in shoots.”
t0“Radish (Raphanus sativus) Seedlings”
Claim · model-written summary
CAT activity decreased in shoots only.
- Taxon
- Raphanus sativusRaphanus sativust0
- Organ / stage
- shootse0
- Outcome
- CAT activitye0
- Direction
- decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“CAT activity decreased only in shoots.”
t0“Radish (Raphanus sativus) Seedlings”
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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.