| .植物吸收、迁移和代谢有机污染物的机理及影响因素[J].农业环境科学学报,2013,32(4):. |
| 植物吸收、迁移和代谢有机污染物的机理及影响因素 |
| Uptake, Translocation and Metabolism of Organic Pollutants by Plants：Mechanisms and Affecting Factors |
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| DOI：10.11654/jaes.2013.04.001 |
| 中文关键词: 植物 有机污染物 吸收 迁移 代谢 |
| 英文关键词: plant organic pollutants uptake translocation metabolism |
| 基金项目: |
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| 摘要点击次数: 4067 |
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| 中文摘要: |
| 植物对有机污染物在环境中的归趋行为具有重要影响。分析了植物吸收、迁移和代谢有机污染物的相关机理，重点介绍了植物根部和地上部对有机污染物吸收的过程及规律，指出利用脂质-水分配系数（Klip）代替辛醇-水分配系数（KOW），以及考虑植物碳水化合物的影响，可以更准确地评价植物对有机污染物的吸收能力；探讨了利用蒸腾流浓度因子（Transpiration stream concentration factor，TSCF）指示有机污染物从根部往地上部迁移能力的可行性及其相关研究进展；简要介绍了有机污染物在植物细胞内的代谢过程及所涉及的酶系；进而从加强吸收机理研究、考虑有机污染物的代谢和毒性、完善预测模型构建等方面对该研究领域进行了展望。 |
| 英文摘要: |
| 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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