Interaction of TiO 2 nanoparticles with soil: Effect on microbiological and chemical traits.

Titanium dioxide (TiO ₂ ) nanoparticles (NPs) are the most widely used nanomaterials and their expanding use raises concerns about their impacts on soil ecosystems and functioning. The present study evaluates the potential impacts of TiO ₂ NPs applied at low doses (0, 1.0, 2.5, 5.0, 10.0 and 20.0 mg L ^-1 ) on soil chemical properties including the macro and micronutrient contents, microbial population and enzyme activities in rhizosphere soil of mung bean crop at different time intervals (7, 14, 28 and 56 days). A quantitative RT-PCR study was also performed to study the relative change in the gene expression of ammonia oxidizer and nitrogen fixers upon TiO ₂ NP supplementation. An increase in soil nutrient content viz., available N, P, Cu, Fe, Mn, nitrate-N and ammonical-N was observed with NP application except available K and Zn content. The TiO ₂ NPs stimulated the growth of soil microflora at low concentrations while an inhibitory effect was recorded at high concentrations. The soil fungi and actinobacteria emerged as the most sensitive groups of soil microbes towards TiO ₂ NP exposure exhibiting detrimental impacts on their growth at all concentrations. Similarly, the soil enzyme activities enhanced till TiO ₂ NPs (10.0 mg L ^-1 ) which was followed by decrease at higher concentrations. The qRT-PCR study showed that the ammonia oxidizers were more affected by TiO ₂ NPs application than nitrogen fixers. These findings suggest that TiO ₂ NPs can be used as stimulators of soil nutrients and soil microbial dynamics at low concentrations.
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