Journal of Soil and Plant Interactions

To date, limited research has been done worldwide on uptake and translocation of nanoparticles (NPs) by plants. To evaluate such processes, soybean (Glycine max L.) was cultured in modified Hoagland nutrient solution containing Fe3O4 NPs with concentration of 60 mg/L, and 33 mg/L iron chelate (Fe-EDTA) was taken as control. After 28 days, the strength of magnetic signal was measured in different organs of the soybean by vibrating sample magnetometer (VSM) instrument. Result showed no magnetization signal from the control plants, but signals with various strengths were found in the tissue samples of the treated plants. Strong magnetic signal in soybean leaves clearly indicated the uptake and translocation of Fe3O4 NPs by roots and xylem. The strongest magnetic signal (138 memu/g) was detected in roots, and transfer coefficient of NPs from roots to leaves was about 0.9 percent. Exudates and surface charge of roots caused accumulation of magnetite NPs on soybean roots' surface. A small fraction of particles moved through simplastic pathways into the xylem and streamed to leaves via sap flow. NPs were accumulated in the crown more than other aerial parts, due to vascular change in structure (root to shoot). In summary, results demonstrated that Fe3O4 NPs can be taken up by soybean and be translocated to other plant tissues in molecular form

Keywords: Nanotechnology, Vibrating sample magnetometer, Iron chelate

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