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Accumulation and Toxicity of Lanthanum and Neodymium in Horticultural Plants

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Title: Accumulation and Toxicity of Lanthanum and Neodymium in Horticultural Plants
Author: Rezaee, Arefeh
Department: School of Engineering
Program: Engineering
Advisor: Chiang, Emily YW
Abstract: In this study, the dose response of Brassica chinensis L. and Helianthus annuus L. to light rare earth elements (REEs), lanthanum and neodymium, were investigated in vitro. The phytotoxicity of the studied REEs was determined by measuring the aboveground and belowground biomass, and the chlorophyll concentration of the plants. The half maximal inhibitory concentration (IC50) in plant biomass and total chlorophyll concentration were estimated. The available ion species of La and Nd for plant uptake were determined through geochemical modeling. The concentration of these elements in the plants was measured to assay the ability of these plants to hyperaccumulate. Low dosages of La and Nd showed hormetic effects on the shoot and root masses of Helianthus annuus L., while both elements at high concentrations were toxic to the species tested. Tissue content analysis result indicated that the plants were not effective hyperaccumulators.
URI: http://hdl.handle.net/10214/9917
Date: 2016-08-31


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