Li Wenxue, Chen Tongbin
Laboratory of Environmental Remediation, Institute of Geographical Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China.
Ying Yong Sheng Tai Xue Bao. 2003 Apr;14(4):627-31.
In comparison with normal plants, hyperaccumulators have the ability to accumulate heavy metals in their shoots far exceeding those observed in soil, without suffering from detrimental effects. With the help of molecular technologies, the research on the mechanisms of heavy metal accumulation in hyperaccumulators has been made a great progress. A number of trace element transporters have been cloned by functional complementation with yeast mutants defective in metal absorption. The relations between glutathione, phytochelatins metallothioneins, organic acids and heavy metals have been studied by molecular technologies. This review concentrated on the physiological and molecular mechanisms of heavy metal absorption and sequestration in hyperaccumulators.
与正常植物相比，超富集植物能够在地上部分积累重金属，其积累量远远超过土壤中的含量，且不会受到有害影响。借助分子技术，超富集植物中重金属积累机制的研究取得了很大进展。通过与金属吸收缺陷型酵母突变体进行功能互补，已克隆出一些微量元素转运蛋白。利用分子技术研究了谷胱甘肽、植物螯合肽、金属硫蛋白、有机酸与重金属之间的关系。本文综述了超富集植物吸收和螯合重金属的生理和分子机制。
