Abstract
BACKGROUND: Rice is particularly effective, compared to other cereals, at accumulating arsenic (As), a nonthreshold, class 1 human carcinogen in shoot and grain. Nano-zinc oxide is gradually used in agricultural production due to its adsorption capacity and as a nutrient element. An experiment was performed to explore the effects of zinc oxide nanoparticles (nZnO) on arsenic (As) toxicity and bioaccumulation in rice. Rice seedlings were treated with different levels of nZnO (0, 10, 20, 50, 100 mg/L) and As (0, and 2 mg/L) for 7 days. RESULTS: The research showed that 2 mg/L of As treatment represented a stress condition, which was evidenced by phenotypic images, seedling dry weight, chlorophyll, and antioxidant enzyme activity of rice shoot. The addition of nZnO (10-100 mg/L) enhanced the growth and photosynthesis of rice seedlings. As concentrations in the shoots and roots were decreased by a maximum of 40.7 and 31.6% compared to the control, respectively. Arsenite [As (III)] was the main species in both roots (98.5-99.5%) and shoots (95.0-99.6%) when exposed to different treatments. Phytochelatins (PCs) content up-regulated in the roots induced more As (III)-PC to be complexed and reduced As (III) mobility for transport to shoots by nZnO addition. CONCLUSION: The results confirmed that nZnO could improve rice growth and decrease As accumulation in shoots, and it performs best at a concentration of 100 mg/L.
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Claims 9
Claim · model-written summary
The 2 mg/L arsenic treatment represented a stress condition in rice, evidenced by phenotypic images, seedling dry weight and chlorophyll.
- Taxon
- rice
Oryza sativat0 - Treatment
- 2 mg/L of Ase0
- Outcome
- phenotypic images, seedling dry weight, chlorophylle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Zinc oxide nanoparticles alleviate the arsenic toxicity and decrease the accumulation of arsenic in rice (Oryza sativa L.)”
e0“2 mg/L of As treatment represented a stress condition, which was evidenced by phenotypic images, seedling dry weight, chlorophyll, and antioxidant enzyme activity of rice shoot”
Claim · model-written summary
The 2 mg/L arsenic treatment reduced antioxidant enzyme activity in rice shoot, indicating stress.
- Taxon
- riceOryza sativat0
- Organ / stage
- shoote0
- Treatment
- 2 mg/L of Ase0
- Outcome
- antioxidant enzyme activitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Zinc oxide nanoparticles alleviate the arsenic toxicity and decrease the accumulation of arsenic in rice (Oryza sativa L.)”
e0“2 mg/L of As treatment represented a stress condition, which was evidenced by phenotypic images, seedling dry weight, chlorophyll, and antioxidant enzyme activity of rice shoot”
Claim · model-written summary
Adding nZnO at 10-100 mg/L enhanced growth and photosynthesis of rice seedlings.
- Taxon
- riceOryza sativat0
- Treatment
- nZnO (10-100 mg/L)e1
- Outcome
- growth and photosynthesise1
- Direction
- enhancede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Zinc oxide nanoparticles alleviate the arsenic toxicity and decrease the accumulation of arsenic in rice (Oryza sativa L.)”
e1“The addition of nZnO (10-100 mg/L) enhanced the growth and photosynthesis of rice seedlings”
Claim · model-written summary
nZnO decreased arsenic concentration in rice shoots by a maximum of 40.7% compared with the control.
- Taxon
- riceOryza sativat0
- Organ / stage
- shootse2
- Treatment
- nZnOe1
- Outcome
- As concentrationse2
- Direction
- decreasede2
- Value
- 40.7e2
- Qualifier
- maximume2
- Comparator
- controle2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Zinc oxide nanoparticles alleviate the arsenic toxicity and decrease the accumulation of arsenic in rice (Oryza sativa L.)”
e1“The addition of nZnO (10-100 mg/L) enhanced the growth and photosynthesis of rice seedlings”
e2“As concentrations in the shoots and roots were decreased by a maximum of 40.7 and 31.6% compared to the control, respectively”
Claim · model-written summary
nZnO decreased arsenic concentration in rice roots by a maximum of 31.6% compared with the control.
- Taxon
- riceOryza sativat0
- Organ / stage
- rootse2
- Treatment
- nZnOe1
- Outcome
- As concentrationse2
- Direction
- decreasede2
- Value
- 31.6%e2
- Qualifier
- maximume2
- Comparator
- controle2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Zinc oxide nanoparticles alleviate the arsenic toxicity and decrease the accumulation of arsenic in rice (Oryza sativa L.)”
e1“The addition of nZnO (10-100 mg/L) enhanced the growth and photosynthesis of rice seedlings”
e2“As concentrations in the shoots and roots were decreased by a maximum of 40.7 and 31.6% compared to the control, respectively”
Claim · model-written summary
Arsenite [As (III)] was the main arsenic species in rice roots (98.5-99.5%) under different treatments.
- Taxon
- riceOryza sativat0
- Organ / stage
- rootse3
- Treatment
- different treatmentse3
- Outcome
- Arsenite [As (III)] was the main speciese3
- Value
- 98.5-99.5%e3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Zinc oxide nanoparticles alleviate the arsenic toxicity and decrease the accumulation of arsenic in rice (Oryza sativa L.)”
e3“Arsenite [As (III)] was the main species in both roots (98.5-99.5%) and shoots (95.0-99.6%) when exposed to different treatments”
Claim · model-written summary
Arsenite [As (III)] was the main arsenic species in rice shoots (95.0-99.6%) under different treatments.
- Taxon
- riceOryza sativat0
- Organ / stage
- shootse3
- Treatment
- different treatmentse3
- Outcome
- Arsenite [As (III)] was the main speciese3
- Value
- 95.0-99.6%e3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Zinc oxide nanoparticles alleviate the arsenic toxicity and decrease the accumulation of arsenic in rice (Oryza sativa L.)”
e3“Arsenite [As (III)] was the main species in both roots (98.5-99.5%) and shoots (95.0-99.6%) when exposed to different treatments”
Claim · model-written summary
nZnO addition raised phytochelatin content in rice roots, which complexed more As(III)-PC and reduced As(III) mobility for transport to shoots.
- Taxon
- riceOryza sativat0
- Treatment
- nZnO additione4
- Compound
- Phytochelatins (PCs)e4
- Outcome
- As (III) mobility for transport to shootse4
- Direction
- reducede4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Zinc oxide nanoparticles alleviate the arsenic toxicity and decrease the accumulation of arsenic in rice (Oryza sativa L.)”
e4“Phytochelatins (PCs) content up-regulated in the roots induced more As (III)-PC to be complexed and reduced As (III) mobility for transport to shoots by nZnO addition”
Claim · model-written summary
nZnO performed best at a concentration of 100 mg/L among the tested concentrations.
- Taxon
- riceOryza sativat0
- Treatment
- nZnOe5
- Outcome
- performs beste5
- Direction
- performs beste5
- Qualifier
- a concentration of 100 mg/Le5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Zinc oxide nanoparticles alleviate the arsenic toxicity and decrease the accumulation of arsenic in rice (Oryza sativa L.)”
e5“nZnO could improve rice growth and decrease As accumulation in shoots, and it performs best at a concentration of 100 mg/L”