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Quantification of nickel and cobalt mobility and accumulation via the phloem in the hyperaccumulator Noccaea caerulescens (Brassicaceae)

文献类型： 外文期刊

作者： Deng, Teng-Hao-Bo 1 ; Chen, Jie-Qian 3 ; Geng, Ke-Rui 3 ; van der Ent, Antony 4 ; Tang, Ye-Tao 3 ; Wen, Dian 1 ; Wang, 1 ;

作者机构： 1.Guangdong Acad Agr Sci, Inst Qual Stand & Monitoring Technol Agroprod, R330 Chuangxin Bldg, Guangzhou 510640, Peoples R China

2.Minist Agr, Key Lab Testing & Evaluat Agroprod Safety & Qual, Guangzhou 510640, Peoples R China

3.Sun Yat Sen Univ, Sch Environm Sci & Engn, R605, Guangzhou 510275, Peoples R China

4.Univ Queensland, Ctr Mined Land Rehabil, Sustainable Minerals Inst, St Lucia, Qld 4072, Australia

5.Sun Yat Sen Univ, Guangdong Prov Key Lab Environm Pollut Control &, Guangzhou 510275, Peoples R China

6.Univ Lorraine, Lab Sols & Environm, INRA, 2 Ave Foret de Haye,TSA 40602, F-54518 Vandoeuvre Les Nancy, France

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

关键词： hyperaccumulators; nickel; cobalt; phloem mobility

期刊名称：METALLOMICS （ 影响因子：4.526； 五年影响因子：4.69 ）

ISSN： 1756-5901

年卷期： 2021 年 13 卷 4 期

页码：

收录情况： SCI

摘要： Hyperaccumulators have exceptional phloem translocation capability for heavy metals. This study aims at quantifying the mobility and accumulation of Ni and Co via the phloem in the model hyperaccumulator Noccaea caerulescens. "Phloem loading capability (PLC)," which is calculated by the "Metal content in phloem sap/Metal content in leaves," was introduced to evaluate the metal phloem mobility, while "Phloem mobility value (PMV)" was used for the normalization of PLC, which sets the PLC of Sr as PMV 0 and that of Rb as 100. The results showed that the PMVs of Ni and Co were 63 and 47, respectively. And the phloem mobility of Rb, Ni, Co, and Sr could be graded as highly mobile, mobile, intermediate, and immobile accordingly. The phloem stream can supply up to 19.1% and 16.0% of the total Ni and Co accumulated in the young leaves, respectively, while for Rb and Sr, the phloem contributes to 29% and 1.4% of the total Rb or Sr, indicating phloem contribution of certain metal is directly linked with its mobility. The results of this study raise the importance of phloem translocation on metal accumulation in shoots and provide insights on the metal cycling process in hyperaccumulators.

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