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Functional Analysis of TiO2 Nanoparticle Toxicity in Three Plant Species

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Abstract

Titanium dioxide nanoparticles (nano-TiO2) are manufactured and used worldwide in large quantities. However, phytotoxicity research on nano-TiO2 has yielded confusing results, ranging from strong toxicity to positive effects. Therefore, in this research, the effects of nano-TiO2 on the germination and root elongation of seed and seedlings were studied. Additionally, the uptake and physiological responses of mature plants were investigated. Physical chemistry data were analyzed to assess the availability of nano-TiO2. Finally, a hydroponic system designed to overcome nano-TiO2 precipitation was used to reproduce the environmental conditions of actual fields. Nano-TiO2 did not have any effect on seed germination or on most of the plant species tested. Nano-TiO2 had positive effects on root elongation in some species. No physiological differences in enzyme activities or chlorophyll content were detected, even though the plants absorbed nano-TiO2. Physical chemistry data showed that nano-TiO2 agglomerated rapidly and formed particles with much bigger hydrodynamic diameters, even in distilled water and especially in a hydroponic system. Furthermore, agglomerated nano-TiO2 formed precipitates; this would be more severe in an actual field. Consequently, nano-TiO2 would not be also readily available to plants and would not cause any significant effects on plants. Our results and other reports suggest that titanium itself is not phytotoxic, even though plants absorb titanium. In conclusion, nano-TiO2 is not toxic to the three plant species, in vitro or in situ.

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Acknowledgments

This research is supported by the Risk Assessment Division of the National Institute of Environmental Research, Korea (project no. 0458–20110011).

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Authors and Affiliations

  1. School of Biological Sciences, Seoul National University, Seoul, 151-747, Republic of Korea

    Uhram Song, Minjoo Shin, Gisuk Lee & Eun Ju Lee

  2. Department of Chemical and Biological Engineering, Korea University, Seoul, 136-701, Republic of Korea

    Jinkyu Roh

  3. Department of Chemical Engineering, Kwangwoon University, Seoul, 139-701, Republic of Korea

    Younghun Kim

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  1. Uhram Song
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Correspondence to Eun Ju Lee.

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Song, U., Shin, M., Lee, G. et al. Functional Analysis of TiO2 Nanoparticle Toxicity in Three Plant Species. Biol Trace Elem Res 155, 93–103 (2013). https://doi.org/10.1007/s12011-013-9765-x

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