2 research outputs found
Effect of Cerium Oxide Nanoparticles on Rice: A Study Involving the Antioxidant Defense System and In Vivo Fluorescence Imaging
Previous
studies have reported the uptake of cerium oxide nanoparticles
(<i>n</i>CeO<sub>2</sub>) by plants, but their physiological
impacts are not yet well understood. This research was aimed to study
the impact of <i>n</i>CeO<sub>2</sub> on the oxidative stress
and antioxidant defense system in germinating rice seeds. The seeds
were germinated for 10 days in <i>n</i>CeO<sub>2</sub> suspension
at 62.5, 125, 250, and 500 mg L<sup>–1</sup> concentrations.
The Ce uptake, growth performance, stress levels, membrane damage,
and antioxidant responses in seedlings were analyzed. Ce in tissues
increased with increased <i>n</i>CeO<sub>2</sub> concentrations,
but the seedlings showed no visible signs of toxicity. Biochemical
assays and in vivo imaging of H<sub>2</sub>O<sub>2</sub> revealed
that, relative to the control, the 62.5 and 125 mg <i>n</i>CeO<sub>2</sub> L<sup>–1</sup> treatments significantly reduced
the H<sub>2</sub>O<sub>2</sub> generation in both shoots and roots.
Enhanced electrolyte leakage and lipid peroxidation were found in
the shoots of seedlings grown at 500 mg <i>n</i>CeO<sub>2</sub> L<sup>–1</sup>. Altered enzyme activities and levels
of ascorbate and free thiols resulting in enhanced membrane damage
and photosynthetic stress in the shoots were observed at 500 mg <i>n</i>CeO<sub>2</sub> L<sup>–1</sup>. These findings demonstrate
a <i>n</i>CeO<sub>2</sub> concentration-dependent modification
of oxidative stress and antioxidant defense system in rice seedlings
Toxicity Assessment of Cerium Oxide Nanoparticles in Cilantro (<i>Coriandrum sativum</i> L.) Plants Grown in Organic Soil
Studies have shown that CeO<sub>2</sub> nanoparticles (NPs) can
be accumulated in plants without modification, which could pose a
threat for human health. In this research, cilantro (<i>Coriandrum
sativum</i> L.) plants were germinated and grown for 30 days
in soil amended with 0 to 500 mg kg<sup>–1</sup> CeO<sub>2</sub> NPs and analyzed by spectroscopic techniques and biochemical assays.
At 125 mg kg<sup>–1</sup>, plants produced longer roots (<i>p</i> ≤ 0.05), and at 500 mg kg<sup>–1</sup>,
there was higher Ce accumulation in tissues (<i>p</i> ≤
0.05). At 125 mg, catalase activity significantly increased in shoots
and ascorbate peroxidase in roots (<i>p</i> ≤ 0.05).
The FTIR analyses revealed that at 125 mg kg<sup>–1</sup> the
CeO<sub>2</sub> NPs changed the chemical environment of carbohydrates
in cilantro shoots, for which changes in the area of the stretching
frequencies were observed. This suggests that the CeO<sub>2</sub> NPs
could change the nutritional properties of cilantro