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| Uptake, Translocation and Metabolism of Organic Pollutants by Plants：Mechanisms and Affecting Factors |
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| KeyWord:plant; organic pollutants; uptake; translocation; metabolism |
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| Abstract: |
| Higher plants hold an important impact on the fates of organic pollutants in the environment. Plant uptake, accumulation and metabolism are key processes that affect movement and transformation of organic pollutants. In this paper, current progress on the main mechanisms of plant uptake, translocation and metabolism of organic pollutants was reviewed, with particular emphasis on uptake pathways by both roots and shoots. We pointed out that the use of lipid-water partition coefficient（Klip） instead of octanol-water partition coefficient（KOW） would give a more accurate evaluation on the uptake ability of plants, when the effects of plant carbonhydrate were concerned as well. Results from a new observation technology namely Two-photon excitation microscopy（TPEM） suggested that apoplastic movement might be the dominant pathway for uptake of organic pollutants, especially for the highly hydrophobic ones. The feasibility of using transpiration stream concentration factor（TSCF） as an indicator of organic pollutants translocation from root to shoot was discussed. Although high translocation ability of moderately hydrophobic organic pollutants was mostly reported, new evidence indicated that highly soluble compounds might have similar results. Meanwhile, the metabolism pathways of organic pollutants in plants cells and the enzymes involved were also presented. Finally, the perspectives on uptake mechanisms, metabolism and phytotoxicity of organic pollutants in plant, and uptake models were put forward to develop this research areas. |
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