Jump to main content
Jump to site search

Issue 1, 2019
Previous Article Next Article

Effect of CeO2 nanomaterial surface functional groups on tissue and subcellular distribution of Ce in tomato (Solanum lycopersicum)

Author affiliations

Abstract

Using recent advances in X-ray microscopy, this study aimed to elucidate mechanisms of uptake, subcellular distribution, and translocation of functionalized CeO2 MNM (manufactured nanomaterials), having different charges, by tomato plants (Solanum lycopersicum cv Micro-Tom). We found that plant growth and Ce concentration in tissues were functions of surface charge and exposure concentration with root to shoot translocation being much greater for negatively charged CeO2 than positive or neutral CeO2. Mechanisms of entry into roots and translocation within plants were examined using X-ray nano- and microprobes. There were dramatic differences in the tissue and subcellular distributions of Ce in plant roots exposed to dextran-coated CeO2 nanoparticles conjugated with positive, neutral and negative functional groups. Positively charged CeO2 remained mainly bound to the epidermis of the root with little present in the apoplast or cytoplasm. Negatively charged CeO2 was found in the cytoplasm throughout the root cross section, and negatively charged CeO2 was found within the apoplast in the cortex and both the apoplast and the cytoplasm in the vasculature. Neutral CeO2 likely entered through the gaps between epidermal cells being sloughed off during root growth and penetrated deeper into the interior of the roots (vasculature) via a combination of apoplastic and symplastic transport. Evidence of symplastic Ce transport was observed with the neutrally and negatively charged particles. We observed evidence of endocytosis as the mechanism for entry into the symplast allowing for entry into the xylem. This study provides critical information on how particle surface chemistry influences the biodistribution and cellular localization of nanomaterials in plants and is to date the highest resolution X-ray imaging of nanomaterials in plant cells.

Graphical abstract: Effect of CeO2 nanomaterial surface functional groups on tissue and subcellular distribution of Ce in tomato (Solanum lycopersicum)

Back to tab navigation

Supplementary files

Article information


Submitted
14 Nov 2018
Accepted
28 Nov 2018
First published
10 Dec 2018

Environ. Sci.: Nano, 2019,6, 273-285
Article type
Paper
Author version available

Effect of CeO2 nanomaterial surface functional groups on tissue and subcellular distribution of Ce in tomato (Solanum lycopersicum)

J. Li, R. V. Tappero, A. S. Acerbo, H. Yan, Y. Chu, G. V. Lowry and J. M. Unrine, Environ. Sci.: Nano, 2019, 6, 273
DOI: 10.1039/C8EN01287C

Social activity

Search articles by author

Spotlight

Advertisements