EurekaMag.com logo
+ Site Statistics
References:
53,214,146
Abstracts:
29,074,682
+ Search Articles
+ Subscribe to Site Feeds
EurekaMag Most Shared ContentMost Shared
EurekaMag PDF Full Text ContentPDF Full Text
+ PDF Full Text
Request PDF Full TextRequest PDF Full Text
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter
Follow on Google+Follow on Google+
Follow on LinkedInFollow on LinkedIn

+ Translate

Xylem and Phloem Based Transport of CeO 2 Nanoparticles in Hydroponic Cucumber Plants



Xylem and Phloem Based Transport of CeO 2 Nanoparticles in Hydroponic Cucumber Plants



Environmental Science & Technology 51(9): 5215-5221



Uptake and translocation of manufactured nanoparticles (NPs) in plants have drawn much attention due to their potential toxicity to the environment, including food webs. In this paper, the xylem and phloem based transport of CeO2 NPs in hydroponic cucumber plants was investigated using a split-root system. One half of the root system was treated with 200 or 2000 mg/L of CeO2 NPs for 3 days, whereas the other half remained untreated, with both halves sharing the same aerial part. The quantitative distribution and speciation of Ce in different plant tissues and xylem sap were analyzed by inductively coupled plasma-mass spectrometry, transmission electron microscope, X-ray absorption near edge structure, and X-ray fluorescence. Results show that about 15% of Ce was reduced from Ce(IV) to Ce(III) in the roots of the treated-side (TS), while almost all of Ce remained Ce(IV) in the blank-side (BS). The detection of CeO2 or its transformation products in the xylem sap, shoots, and BS roots indicates that Ce was transported as a mixture of Ce(IV) and Ce(III) from roots to shoots through xylem, while it was transported almost only in the form of CeO2 from shoots back to roots through phloem. To our knowledge, this is the first report of root-to-shoot-to-root redistribution after transformation of CeO2 NPs in plants, which has significant implications for food safety and human health.

(PDF same-day service: $19.90)

Accession: 060483491

Download citation: RISBibTeXText

PMID: 28383248

DOI: 10.1021/acs.est.6b05998



Related references

Xylem- and phloem-based transport of CuO nanoparticles in maize (Zea mays L.). Environmental Science & Technology 46(8): 4434-4441, 2012

Nutrients and metabolites of fluids recovered from xylem and phloem: significance in relation to long-distance transport in plants. Transport and transfer processes in plants [Wardlaw, IF; Passioura, JB Editors]: 253-281, 1976

Physicochemical factors governing the transport of xenobiotic chemicals in plants: movement into roots and partitioning between xylem and phloem. Acta Horticulturae ( 239): 43-54, 1989

Linking phloem function to structure: analysis with a coupled xylem-phloem transport model. Journal of Theoretical Biology 259(2): 325-337, 2009

Quantification of the xylem-to-phloem transfer of amino acids by use of inulin carboxylic acid as xylem transport marker. Plant Science Letters 35(1): 81-85, 1984

Quantification of the xylem to phloem transfer of amino acids by use of inulin carbon 14 labeled carboxylic acid as xylem transport marker. Plant Science Letters 35(1): 81-86, 1984

Root zone temperature effects on nitrate assimilation and xylem transport in hydroponically grown cucumber plants. Acta Horticulturae (588): 59-62, 2002

Influence of organic and inorganic nitrogen supply on the composition of tomato seedling root exudates, xylem and phloem sap grown in hydroponic culture. 2008

Simultaneous measurement of water flow velocity and solute transport in xylem and phloem of adult plants of Ricinus communis over a daily time course by nuclear magnetic resonance spectrometry. Plant cell and environment 24(5): 491-503, 2001

Effects of root zone temperature on nitrate assimilation and xylem transport of hydroponically grown cucumber (Cucumis sativas L.) plants. Journal of the Korean Society for Horticultural Science 43(4): 411-414, 2002

Ion accumulation in pericarp and endocarp of cucumber fruit as influenced by xylem and phloem import. Hortscience 28(5): 171, 1993

Solute exchanges from xylem to phloem in the leaf and from phloem to xylem in the root. (see Book Title) [Author] Bonnemain, J L , et al (Ed ) Recent advances in phloem transport and assimilate compartmentation; Fourth International Conference on Phloem Transport and Assimilate Compartmentation, Charente, France, August 19-24, 1990 xiv+344p Ouest Editions: Nantes, France Illus ISBN 2-908261-61-8 : 96-105, 1991

Translocation in plants possessing supernumerary phloem. II. The included phloem of Bougainvillea glabra Choisy and the bicolateral bundles of cucumber (Cucumis sativus L.). Journal of Experimental Botany 28(102): 127-129, 1977

Translocation in plants possessing supernumerary phloem part 2 the included phloem of bougainvillea glabra and the bicolateral bundles of cucumber cucumis sativus. Journal of Experimental Botany 28(102): 127-132, 1977

A potential role for xylem-phloem interactions in the hydraulic architecture of trees: effects of phloem girdling on xylem hydraulic conductance. Tree Physiology 24(8): 911-917, 2004