Alleviative effects of magnetic Fe₃O₄ nanoparticles on the physiological toxicity of 3-nitrophenol to rice (Oryza sativa L.) seedlings

Abstract

In the present study, we explored whether magnetic iron oxide nanoparticles (MNPs-Fe3O4) can be used to alleviate the toxicity of 3-nitrophenol (3-NP) to rice (Oryza sativa L.) seedlings grown under hydroponic conditions. The results showed that 3-NP from 7 to 560 μM decreased the growth, photochemical activity of the photosystem II (PS II), and chlorophyll content of the seedlings in a concentration-dependent manner. In the presence of 3-NP, 2,000 mg L−1 MNPs-Fe3O4 were added to the growth medium as the absorbents of 3-NP and then were separated with a magnet. The emergence of MNPs-Fe3O4 effectively alleviated the negative effects of 3-NP on rice seedlings. In addition, the long-term presence of MNPs-Fe3O4 (from 100 to 2,000 mg L−1) in the growth medium enhanced the growth, production of reactive oxygen species (ROS), activities of antioxidant enzymes, photochemical activity of PS II, and chlorophyll content of the rice seedlings. These results suggest that MNPs-Fe3O4 could be used as potential additives to relieve the physiological toxicity of 3-NP to rice seedlings.

Potential Effects of Metal Oxides on Agricultural Production of Rice: A Mini Review

“…Moreover, Li et al also found that low doses of zero-valent iron (ZVI) and Fe 3 O 4 NPs could be used as an alternative to Fe fertilizers and improve plant growth under Fe-deficient conditions by alleviating oxidative stress and regulating phytohormones in rice plants caused by Fe deficiency [ 23 ]. In addition, Sainao et al used MNPs-Fe 3 O 4 (iron oxide nanoparticles containing both Fe 2+ and Fe 3+ ions) to mitigate the toxic effects of 3-nitrophenol on rice seedlings [ 27 , 28 , 29 ].…”

Sodium Alginate/β-Cyclodextrin Reinforced Carbon Nanotubes Hydrogel as Alternative Adsorbent for Nickel(II) Metal Ion Removal

“…Furthermore, as MWCNTs are rich in oxygenated functional groups that face outward, they can easily and efficiently crosslink with β-CD through acetalization [38]. The addition of CNTs onto the hydrogel structure was expected to overcome the collapsing and high solubility problems caused by the weakening of electron repulsion and the reduction of oxygenated functional groups during the sorption process [38,39]. In addition, the concentration of the Ni(II) solution after and before adsorption was used to study the change in Ni(II) concentration in the solution.…”

“…pected to overcome the collapsing and high solubility problems caused by the weakening of electron repulsion and the reduction of oxygenated functional groups during the sorption process [38,39]. In addition, the concentration of the Ni(II) solution after and before adsorption was used to study the change in Ni (II) concentration in the solution.…”