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

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). As a result, 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 combinationmore » 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. Finally, 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.« less

Authors:

Li, Jieran ^[1]; Tappero, Ryan V. ^[2]; Acerbo, Alvin S. ^[3]; Yan, Hanfei ^[2]; Chu, Yong ^[2]; Lowry, Gregory V.  ^[4];

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• Search DOE PAGES for ORCID "0000-0001-8599-008X"

Unrine, Jason M.  ^[1]

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• Search DOE PAGES for ORCID "0000-0003-3012-5261"

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+ Show Author Affiliations

1. Univ. of Kentucky, Lexington, KY (United States)
2. Brookhaven National Lab. (BNL), Upton, NY (United States)
3. Univ. of Chicago, IL (United States)
4. Carnegie Mellon Univ., Pittsburgh, PA (United States)

Publication Date:

Mon Dec 10 00:00:00 EST 2018

Research Org.:

Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Org.:

USDOE Office of Science (SC), Basic Energy Sciences (BES)

OSTI Identifier:

1506633

Alternate Identifier(s):

OSTI ID: 1485187

Report Number(s):

BNL-211517-2019-JAAM
Journal ID: ISSN 2051-8153; ESNNA4

Grant/Contract Number:  

SC0012704; FG02-92ER14244; AC02-06CH11357

Resource Type:

Accepted Manuscript

Journal Name:

Environmental Science: Nano

Additional Journal Information:

Journal Volume: 6; Journal Issue: 1; Journal ID: ISSN 2051-8153

Publisher:

Royal Society of Chemistry

Country of Publication:

United States

Language:

English

Subject:

54 ENVIRONMENTAL SCIENCES; 36 MATERIALS SCIENCE