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Phosphorus mediated rhizosphere mobilization and apoplast precipitation regulate rare earth element accumulation in Phytolacca americana

文献类型： 外文期刊

作者： Liu, Chong 1 ; Ding, Ting-Xuan 1 ; Liu, Wen-Shen 1 ; Tang, Ye-Tao 1 ; Qiu, Rong-Liang 1 ;

作者机构： 1.Sun Yat Sen Univ, Sch Environm Sci & Engn, Guangzhou 510006, Peoples R China

2.Guangdong Acad Agr Sci, Inst Agr Resources & Environm, Guangzhou 510640, Peoples R China

3.Sun Yat Sen Univ, Guangdong Prov Key Lab Environm Pollut Control &, Guangzhou 510006, Peoples R China

4.Sun Yat Sen Univ, Guangdong Prov Engn Res Ctr Heavy Met Contaminate, Guangzhou 510006, Peoples R China

5.South China Agr Univ, Coll Nat Resources & Environm, Guangdong Prov Key Lab Agr & Rural Pollut Abateme, Guangzhou 510642, Peoples R China

6.Guangdong Lab Lingnan Modern Agr, Guangzhou 510642, Peoples R China

关键词： Rare earth element; Phytoextraction; Hyperaccumulator; Rhizosphere mobilization; Phosphate precipitation

期刊名称：PLANT AND SOIL （ 影响因子：4.993； 五年影响因子：5.44 ）

ISSN： 0032-079X

年卷期：

页码：

收录情况： SCI

摘要： Aims The plant available phosphorus (P) is deemed as the main soil factor affecting the accumulation of rare earth elements (REEs) in the hyperaccumulator plant Phytolacca americana, but the underlying mechanisms are largely unknown. Methods Soil P amendment and exogenous organic acids addition experiments were employed to determinate the P-induced soil chemical properties changes and subsequent REE accumulation variations in P. americana. Manipulations of P and REE concentration were also conducted under hydroponic conditions, and the translocation of P and REE from roots to shoots was analyzed. Results P-deficiency induced a decrease of pH (0.8 unit) and secretion of organic acids in the rhizosphere, thus contributing to the mobilization of P and REEs, and the increased REE accumulation in P. americana eventually. However, an elevated soil P supply reduced REE accumulation by 90% in shoots. P spray did not affect the accumulation of yttrium (Y) in P. americana under 1-10 mu mol L-1 Y treatment, but limited Y translocation from roots to shoots under 100 mu mol L-1 Y treatment. Moreover, compared to 1 mu mol L-1 Y treatment, under 100 mu mol L-1 Y the root P concentration was nearly tripled and more P was allocated to the apoplast. The linear regression slope between Y and P concentrations in the roots of hydroponic P. americana was 3.4, being close to the Y/P ratio of YPO4 precipitates (2.9). Conclusions Our study demonstrates that P mediated REE mobilization in the rhizosphere and apoplast precipitation within the endosphere can regulate the REE accumulation in P. americana.

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