Shifts in N and δN in Wheat and Barley Exposed to Cerium Oxide Nanoparticles

Overview

Journal NanoImpact

Specialties Biotechnology
Toxicology

Date 2018 Oct 16

PMID 30320238

Citations 1

Authors

Cyren M Rico

Mark G Johnson

Matthew A Marcus

Christian P Andersen

Affiliations

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Abstract

The effects of cerium oxide nanoparticles (CeO-NPs) on N/N ratio (δN) in wheat and barley were investigated. Seedlings were exposed to 0 and 500 mg CeO-NPs/L (Ce-0 and Ce-500, respectively) in hydroponic suspension supplied with NHNO, NH , or NO . N uptake and δN discrimination (i.e. differences in δN of plant and δN of N source) were measured. Results showed that N content and N abundance decreased in wheat but increased in barley. Ce-500 only induced whole-plant δN discrimination (-1.48‰, P ≤ 0.10) with a simultaneous decrease (P ≤ 0.05) in whole-plant δN (-3.24‰) compared to Ce-0 (-2.74‰) in wheat in NH . Ce-500 decreased (P ≤ 0.01) root δN of wheat in NHNO and NH (3.23 and -2.25‰, respectively) compared to Ce-0 (4.96 and -1.27‰, respectively), but increased (P ≤ 0.05) root δN of wheat in NO (3.27‰) compared to Ce-0 (2.60‰). Synchrotron micro-XRF revealed the presence of CeO-NPs in shoots of wheat and barley regardless of N source. Although the longer-term consequences of CeO-NP exposure on N uptake and metabolism are unknown, the results clearly show the potential for ENMs to interfere with plant metabolism of critical plant nutrients such as N even when toxicity is not observed.

Citing Articles

Wheat exposure to cerium oxide nanoparticles over three generations reveals transmissible changes in nutrition, biochemical pools, and response to soil N.

Rico C, Abolade O, Wagner D, Lottes B, Rodriguez J, Biagioni R J Hazard Mater. 2019; 384:121364.

PMID: 31607583 PMC: 7083067. DOI: 10.1016/j.jhazmat.2019.121364.

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