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J Agric Food Chem. 2015 Jan 21;63(2):382-90. doi: 10.1021/jf5052442. Epub 2015 Jan 7.

Uptake and accumulation of bulk and nanosized cerium oxide particles and ionic cerium by radish (Raphanus sativus L.).

Author information

1
Department of Civil and Environmental Engineering and ‡Department of Plant Biology and Center for Ecology, Southern Illinois University , Carbondale, Illinois 62901, United States.

Abstract

The potential toxicity and accumulation of engineered nanomaterials (ENMs) in agricultural crops has become an area of great concern and intense investigation. Interestingly, although below-ground vegetables are most likely to accumulate the highest concentrations of ENMs, little work has been done investigating the potential uptake and accumulation of ENMs for this plant group. The overall objective of this study was to evaluate how different forms of cerium (bulk cerium oxide, cerium oxide nanoparticles, and the cerium ion) affected the growth of radish (Raphanus sativus L.) and accumulation of cerium in radish tissues. Ionic cerium (Ce(3+)) had a negative effect on radish growth at 10 mg CeCl3/L, whereas bulk cerium oxide (CeO2) enhanced plant biomass at the same concentration. Treatment with 10 mg/L cerium oxide nanoparticles (CeO2 NPs) had no significant effect on radish growth. Exposure to all forms of cerium resulted in the accumulation of this element in radish tissues, including the edible storage root. However, the accumulation patterns and their effect on plant growth and physiological processes varied with the characteristics of cerium. This study provides a critical frame of reference on the effects of CeO2 NPs versus their bulk and ionic counterparts on radish growth.

KEYWORDS:

cerium oxide; nanomaterials; nanoparticles; phytotoxicity; plant uptake; radish

PMID:
25531028
DOI:
10.1021/jf5052442
[Indexed for MEDLINE]

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