Plant species-dependent transformation and translocation of ceria nanoparticles

Abstract

Different plant species respond differently to nCeO2 under different culturing conditions: for some, deficiency of P enhances the accumulation of Ce (mainly Ce3+) and phytotoxicity.

Cerium Oxide Nanoparticles Affect Heavy Metals Uptake by Pea in a Divergent Way than Their Ionic and Bulk Counterparts

“…This concentration affects plants physiology but it is not lethal for pea. In fact, majority of studies on toxicity of CeO 2 NPs to terrestrial plants use concentrations in the range 1-1000 mg/L −1 (Holden et al 2014;Rossi et al 2017b), while the phytotoxicity test as recommended by the Environmental Protection Agency, USA (Zhang et al 2019) approach the 2000 mg L −1 level. The fourth series was a reference treated with original Hoagland solution.…”

“…NPs approach plants through variety of mechanisms which are strongly dependent on their size, morphology, charge, settings and agglomeration (Pérez-de-Luque 2017; Yang et al 2017;Zhang et al 2019). All those factors affect the plant response and need to be carefully evaluated.…”

Nanomaterial Transformation in the Soil–Plant System: Implications for Food Safety and Application in Agriculture

“…Another study found that the uptake of Cu(OH) 2 ENMs with higher solubility in roots of wheat (Triticum aestivum) is greater than those with lower solubility (e.g., CuO and CuS ENMs) after 1 h hydroponic exposure. [107] In a follow-up depuration study, the authors removed the exposure solutions an found that both CuO and CuS ENMs persisted in or on the roots and continued to release Cu for translocation to plant leaves over 48 h. There is also some indirect evidence from studies such as that by Zhang and coworkers; here, the authors reported that changing the plant culture medium, [108] plant species, [28] or morphology [26] of the CeO 2 ENMs affected analyte transformation and subsequent translocation. Importantly, removal of phosphates from the culture media dramatically enhanced Ce accumulation in the leaves.…”

“…Importantly, removal of phosphates from the culture media dramatically enhanced Ce accumulation in the leaves. [28] Rod-shaped CeO 2 ENMs have greater reactivity than other morphologies, including octahedral and cubical, and thus, have greater dissolution and accumulation in plant leaves. [26] Significantly higher amounts of CePO 4 needle-like clusters have also been observed on root surfaces ( Figure 2D).…”

“…For example, organic acids can chelate Ce 3+ , forming Ce-carboyxlates. [28] In addition to metal-based ENMs, carbon based nanomaterials can also undergo redox reactions. Carbon nanotubes or graphene can be oxidized by hydroxyl radicals which are normally present in plant leaves at low levels.…”