ASSESSMENT OF STRESS END POINTS IN VIGNA RADIATA SEEDLINGS EXPOSED TO PRE-ACTIVATED TIO2 AND TISIO4 NANOPARTICLES UNDER SOLAR RADIATION

Authors

  • Shweta Kaur School of Environmental Sciences, Jawaharlal Nehru University, New Delhi, India
  • Anurag Maurya School of Environmental Sciences, Jawaharlal Nehru University, New Delhi, India

DOI:

https://doi.org/10.22159/ijpps.2016v8i10.13792

Keywords:

Antioxidative enzymes, Photocatalysis, Nanoparticles, Reactive oxygen species, Phototoxicity

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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Published

2016-10-01

How to Cite

Kaur, S., and A. Maurya. “ASSESSMENT OF STRESS END POINTS IN VIGNA RADIATA SEEDLINGS EXPOSED TO PRE-ACTIVATED TIO2 AND TISIO4 NANOPARTICLES UNDER SOLAR RADIATION”. International Journal of Pharmacy and Pharmaceutical Sciences, vol. 8, no. 10, Oct. 2016, pp. 198-03, doi:10.22159/ijpps.2016v8i10.13792.

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