Phytotoxicity studies of nanoparticles in this report are
mainly restricted to highest concentrations
(1000μg/ml). Synthesis of silver nanoparticles was
done by chemical reductions methods. The
preparations of nanoparticles were done in distilled
water. Formations of particles were confirmed by U.VVis
absorptions spectra at 400 nm (Figure 4). The
absorptions spectra are due to Plasmon excitations of
particles 11. Distributions and particle sizes were
mainly depending upon spectral analysis 10.
Engineered nanoparticles were always exposed to
ecosystem as they were easily released into the
surrounding environment. Small particle size
nanoparticles may become more toxic to plants. The
phytotoxicity of Oryza sativa was lasted for 12 days.
XRD analysis of treated roots at the end of the toxicity
period shows Bragg’s reflections (111) may index on
the basis of Face Centre Cubic structure of silver. This
reveal out the depositions of particles inside the cells.
The diffractions pattern of nanoparticles deposited in
roots are shown in Figure 1.