Uptake, Distribution, and Transformation of Zerovalent Iron Nanoparticles in the Edible Plant Cucumis sativus
Autor: | Dong Soo Hwang, Jitendra Pal Singh, Yoon-Seok Chang, Hakwon Yoon, Keun Hwa Chae, Amarendra Dhar Dwivedi, Sangchul Rho |
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Rok vydání: | 2018 |
Předmět: |
0106 biological sciences
Iron Nanoparticle Metal Nanoparticles Vacuole 010501 environmental sciences 01 natural sciences Environmental Chemistry 0105 earth and related environmental sciences Zerovalent iron biology Chemistry food and beverages General Chemistry biology.organism_classification Transformation (genetics) Membrane Seedlings Shoot Nanoparticles Cucumis sativus Plants Edible Cucumis 010606 plant biology & botany Superparamagnetism Nuclear chemistry |
Zdroj: | Environmental sciencetechnology. 52(17) |
ISSN: | 1520-5851 |
Popis: | Here, we investigated the fate of nanoscale zerovalent iron (nZVI) on the Cucumis sativus under both hydroponic and soil conditions. Seedlings were exposed to 0, 250, and 1000 mg/L (or mg/kg soil) nZVI during 6-9 weeks of a growth period. Ionic controls were prepared using Fe-EDTA. None of the nZVI treatments affected the plant biomass. On the basis of the total iron contents and the superparamagnetic property of nZVI-exposed roots, there was no evidence of pristine nZVI translocation from the roots to shoots. Electron microscopy revealed that the transformed iron nanoparticles are stored in the root cell membrane and the vacuoles of the leaf parenchymal cells. X-ray absorption spectroscopy identified ferric citrate (41%) and iron (oxyhydr)oxides (59%) as the main transformed products in the roots. The shoot samples indicated a larger proportion of ferric citrate (60%) compared to iron (oxyhydr)oxides (40%). The 1.8-fold higher expression of the CsHA1 gene indicated that the plant-promoted transformation of nZVI was driven by protons released from the root layers. The current data provide a basis for two potential nZVI transformation pathways in Cucumis sativus: (1) interaction with low molecular weight organic acid ligands and (2) dissolution-precipitation of the mineral products. |
Databáze: | OpenAIRE |
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