John Wiley & Sons, Ltd.

Accumulation and translocation of 198Hg in four crop species

The uptake and transport of mercury (Hg) through vegetation play an important role in the biogeochemical cycling of Hg. However, quantitative information regarding Hg translocation in plants is poorly understood. In this study, Hg uptake, accumulation and translocation in four corps rice (Oryza.sativa L.), wheat (Triticum L.), corn (Zea mays L.) and oilseed rape (Brassica campestris L.) grown in Hoagland solution were investigated using a stable isotopic (198Hg) tracing technique. The distribution of 198Hg in root, stem and leaf after uptake was quantified and the release of 198Hg into the air from crop leaf was investigated. It was found that the concentration of Hg accumulated in the root, stem and leaf of rice increased linearly with the spiked 198Hg concentration. The uptake equilibrium constant was estimated to be 2.35 mol‐Hg/g‐DW in rice root per mol/L of Hg remaining in the Hoagland solution. More than 94% of 198Hg uptake was accumulated in root for all four crops examined. The translocation to stem and leaf was not significant due to the absence of Hg2+ complexes that facilitate Hg transport in plants. The accumulated 198Hg in stem and leaf was not released from the plant at air Hg0 concentration ranging from 0 to 10 ng/m3. Transfer factor data analysis showed that Hg translocation from stems to leaves was more efficient than that from roots to stems. Environ Toxicol Chem © 2013 SETAC

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