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A novel method for in situ imaging of root exudates and labile elements reveals phosphorus deficiency-induced mobilization of rare earth elements in the rhizosphere of Phytolacca americana

文献类型： 外文期刊

作者： Liu, Chong 1 ; Ding, Ting-Xuan 1 ; van der Ent, Antony 3 ; Liu, Chang 1 ; Morel, Jean Louis 4 ; Sirguey, Catherine 4 ; 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.Wageningen Univ & Res, Lab Genet, NL-6708 PB Wageningen, Netherlands

4.Univ Lorraine, Lab Sols & Environm, INRAE, F-54000 Nancy, France

5.Univ Queensland, Sustainable Minerals Inst, Ctr Mined Land Rehabil, Brisbane, Qld 4072, Australia

6.Sun Yat Sen Univ, Guangdong Prov Key Lab Environm Pollut Control & R, Guangdong Prov Engn Res Ctr Heavy Met Contaminated, Guangzhou 510006, Peoples R China

7.South China Agr Univ, Guangdong Lab Lingnan Modern Agr, Guangdong Prov Key Lab Agr & Rural Pollut Abatemen, Coll Nat Resources & Environm, Guangzhou 510642, Peoples R China

关键词： Root exudates; Mass spectrometry imaging; Rhizosphere effect; Spatial distribution; DGT

期刊名称：PLANT AND SOIL （ 影响因子：4.9； 五年影响因子：5.2 ）

ISSN： 0032-079X

年卷期： 2023 年

页码：

收录情况： SCI

摘要： AimsPhosphorus (P) deficiency-induced mobilization of rare earth elements (REEs) in the rhizosphere contributes to REE accumulation in the hyperaccumulator Phytolacca americana, but a lack of in situ methods for visualization of the root-soil interface limits our understanding of the underlying processes.MethodsDiffusive gradients in thin-films (DGT) devices were used for probing root exudates, REEs and P in the P. americana rhizosphere. Desorption electrospray ionization mass spectrometry and laser-ablation inductively coupled mass spectrometry were used for in situ imaging of root exudates, REEs and P sorbed on the DGT.ResultsThe novel approach demonstrated here is capable of synchronously and quantitatively characterizing the distribution of root exudates and labile elements in the rhizosphere. The secretion fluxes of citrate and oxalate in the rhizosphere under P deficiency were three times higher than under P sufficient condition; and the lanthanum (La) fluxes in the rhizosphere under P deficiency were ten times greater than at P sufficiency condition. The enrichment of P and La under P deficiency and depletion under P sufficient conditions in the rhizosphere suggests that P deficiency-induced organic acid secretion is crucial for the mobilization of soil REEs and subsequent REE accumulation in P. americana.ConclusionThe combination of DGT devices with mass spectrometry imaging is technically feasible for in situ synchronous imaging of root exudates, REEs and labile elements at the root-soil interface. Our study shed light on processes of mobilization of mineral elements in the rhizosphere induced as a side-effect of the P acquisition mechanism.

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