Dear Rahul Sakla, we have published some papers on the toxicity of TiO2 nanoparticles.
Ruffini Castiglione M, Cremonini R. (2009) Nanoparticles and higher plants. Caryologia 62: 161-165.
Ruffini Castiglione M., Giorgetti L., Geri C., Cremonini R (2011) The effects of nano-TiO2 on seed germination, development and mitosis of root tip cells of Vicia narbonensis L. and Zea mays L. Journal of Nanoparticle Research, 13: 2443-2449. doi: 10.1007/s11051-010-0135-8
Giorgetti L., Ruffini Castiglione M., Bernabini M., Geri C. (2011) Nanoparticles effects on growth and differentiation in cell culture of carrot (Daucus carota L.). AGROCHIMICA, 55 (1): 45-53
Ruffini Castiglione M., Giorgetti L., Cremonini R., Bottega S., Spanò C. (2014) Impact of TiO2 nanoparticles on Vicia narbonensis L.: potential toxicity effects. Protoplasma, 251 (6): 1471-1479. doi: 10.1007/s00709-014-0649-5
You can have a look at my profile in ResearchGate.
Thwala M., Musee N., Sikhwivhilu L and Wepener V. 2013. The oxidative toxicity of Ag and ZnO nanoparticles towards the aquatic plant Spirodela punctuta and the role of testing media parameters. Environmental Science: Processes and Impacts, 15(10): 1830-1843.