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Foliar-applied zinc promotes cadmium allocation from leaf surfaces to grains in rice

文献类型： 外文期刊

作者： Liu, Ya-Ting 1 ; Yan, Bo-Fang 1 ; Cai, Xuan 1 ; Zheng, Hong -Xiang 1 ; Qiu, Rong-Liang 1 ; Tang, Ye -Tao 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 Facil Agr, Guangzhou 510640, Peoples R China

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

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

关键词： Atmospheric deposition; Isotope labelling; Metal interaction; Phloem; Cell wall

期刊名称：JOURNAL OF ENVIRONMENTAL SCIENCES （ 影响因子：6.9； 五年影响因子：6.2 ）

ISSN： 1001-0742

年卷期： 2025 年 151 卷

页码：

收录情况： SCI

摘要： The accumulation of Cd by rice poses significant health risks. Foliar fertilization with Zn can reduce grain Cd contents in rice grown in Cd-contaminated soils. However, atmospheric deposition on leaves is another vector of Cd contamination, and it remains unclear how Zn application affects the allocation of such Cd. We conducted an experiment where the flag leaves of rice plants were treated with solutions with various Zn concentrations and a constant Cd concentration. The 111 Cd stable isotope was used to trace the flux of foliarapplied Cd. Higher levels of foliar-applied Zn enhanced Cd efflux and grain allocation. This is attributed to limited sequestration of foliar-applied Cd in the leaf cell symplasm and increased Cd desorption from leaf cell walls when a high Zn2 + concentration occurs in the apoplast. Nonionic Zn oxide nanoparticles mitigated these effects. Additionally, the expressions of OsLCT1 and OsZIP7 in flag leaves and OsHMA2 and OsZIP7 in the uppermost nodes were upregulated under high-Zn2 + treatment, which may facilitate Cd phloem loading and grain allocation. Caution is advised in using foliar Zn in areas with high atmospheric Cd due to potential grain-contamination risks. (c) 2024 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V.

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