Abstract
Objective: The present study was aimed to evaluate the phototoxic effects of sunlight pre-irradiated/nonirradiated TiO2, TiSiO4 nanoparticles and TiO2 bulk powder to Vigna radiata seedlings. Methods: Different concentrations (0.05, 0.2, 0.5 and 1.0 g/l) of nano/bulk particles were applied to the germinated seedlings for 24 h and various biochemical end points were assessed. The end points were superoxide dismutase activity, catalase activity, malondialdehyde (MDA) and proline content. Results: The irradiated nano TiO2 was more phototoxic to the seedlings as compared to both the non-irradiated nano TiO2 as well as the irradiated/non-irradiated TiO2 bulk powder, as revealed by the increased level of antioxidant enzymes activity in irradiated TiO2 nanoparticles treated group. Toxicity in nano TiO2 group was more confined to the lowest concentration (0.05 g/l). Proline, a well-recognized stress biomarker, was found to increase in all the irradiated as well as the non-irradiated groups in a dose dependent manner (0.20 to 1.0 g/l), offering a different mechanism of toxicity from that of antioxidative enzymes. TiSiO4 nanoparticles were not found to be phototoxic significantly under either exposure conditions. Conclusion: The seedlings of the three treatment groups responded variably to the stress biomarkers, indicating that the mode of action of the nanoparticles to the plant was different from that of the bulk particles in irradiated and non-irradiated conditions and was governed by more than a single factor.
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Claims 4
Claim · model-written summary
Irradiated nano TiO2 was more phototoxic than non-irradiated nano TiO2 and TiO2 bulk powder, with higher antioxidant enzyme activity.
- Taxon
- VIGNA RADIATA
.jpg?width=60)
Vigna radiatat0 - Treatment
- irradiated nano TiO2e0
- Outcome
- antioxidant enzymes activitye0
- Direction
- increasede0
- Comparator
- non-irradiated nano TiO2e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“The irradiated nano TiO2 was more phototoxic to the seedlings as compared to both the non-irradiated nano TiO2 as well as the irradiated/non-irradiated TiO2 bulk powder, as revealed by the increased level of antioxidant enzymes activity in irradiated TiO2 nanoparticles treated group.”
t0“VIGNA RADIATA SEEDLINGS”
Claim · model-written summary
Nano TiO2 toxicity was greatest at the lowest tested concentration.
- Taxon
- VIGNA RADIATAVigna radiatat0
- Treatment
- nano TiO2e0
- Outcome
- Toxicitye0
- Direction
- more confinede0
- Value
- 0.05 g/le0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Toxicity in nano TiO2 group was more confined to the lowest concentration (0.05 g/l).”
t0“VIGNA RADIATA SEEDLINGS”
Claim · model-written summary
Proline increased dose dependently in irradiated and non-irradiated groups.
- Taxon
- VIGNA RADIATAVigna radiatat0
- Treatment
- irradiated as well as the non-irradiated groupse0
- Outcome
- Prolinee0
- Direction
- increasee0
- Qualifier
- dose dependent manner (0.20 to 1.0 g/l)e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Proline, a well-recognized stress biomarker, was found to increase in all the irradiated as well as the non-irradiated groups in a dose dependent manner (0.20 to 1.0 g/l)”
t0“VIGNA RADIATA SEEDLINGS”
Claim · model-written summary
TiSiO4 nanoparticles showed no significant phototoxicity under either exposure condition.
- Taxon
- VIGNA RADIATAVigna radiatat0
- Treatment
- TiSiO4 nanoparticlese0
- Outcome
- phototoxice0
- Qualifier
- either exposure conditionse0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“TiSiO4 nanoparticles were not found to be phototoxic significantly under either exposure conditions.”
t0“VIGNA RADIATA SEEDLINGS”
The same questions in other papers
nanoparticle · physiology: antioxidant enzymes · Vigna radiata (mung bean)Positive and negative results
1 paper in the same direction as this paper · 2 in the opposite direction
- positive
- positive
- no effect
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.