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Identification and application of amino acids as chelators in phytoremediation of rare earth elements lanthanum and yttrium

文献类型： 外文期刊

作者： Wu, Junliang 1 ; Chen, Anqaing 3 ; Peng, Shili 1 ; Wei, Zhenggui 4 ; Liu, Gangcai 1 ;

作者机构： 1.Chinese Acad Sci, Key Lab Mt Hazards & Earth Surface Proc, Inst Mt Hazards & Environm, Chengdu 610041, Peoples R China

2.Minist Water Resources, Chengdu 610041, Peoples R China

3.Yunnan Acad Agr Sci, Inst Agr Environm & Resources, Kunming 50205, Peoples R China

4.Nanjing Agr Univ, Coll Resources & Environm Sci, Nanjing 210095, Jiangsu, Peoples R China

5.Univ Chinese Acad Sci, Beijing 100049, Peoples R China

关键词： Phytoremediation;Lanthanum;Yttrium;Amino acids;Xylem sap

期刊名称：PLANT AND SOIL （ 影响因子：4.192； 五年影响因子：4.712 ）

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收录情况： SCI

摘要： This study aimed to identify amino acids that could act as chelators in enhancing absorption and translocation capabilities of a rare earth element (REE) lanthanum and yttrium in a non-hyperaccumulator plant. We analysed correlations between amino acid, La and Y concentrations in xylem saps of the REE hyperaccumulator Phytolacca americana L., to identify functional amino acids in long-distance transportation processes. These were used as chelators to observe the efficacy of La uptake and translocation in REE non-hyperaccumulator tomato seedlings. Pot culture experiments were conducted using modified Hoagland solution artificially contaminated with REEs. Eighteen xylem sap amino acids were identified and measured in the xylem sap, using reversed-phase high-performance liquid chromatography. Aspartic acid, asparagine, histidine and glutamic acid may be related to xylem La and Y long-distance transportion in P. americana L. Extraneous aspartic acid, asparagine, histidine and glutamic acid enhanced La absorption in the whole tomato, compared with La alone. Moreover, the whole tomato La content increased by 449 mu g and 139 mu g in the presence of aspartic acid and asparagine as compared to P. americana L. Tryptophan insignificantly affected La uptake and translocation in tomato seedlings. Aspartic acid and asparagine could potentially promote remediation of La contamination in soil when used as a chelator.

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