Nanostructured hydroxyapatite-zinc complex as a novel foliar system to reduce cadmium accumulation in wheat grain: Performance and mechanism

文献类型： 外文期刊

第一作者： Shi, Gaoling

作者： Shi, Gaoling;Yi, Chao;Zhou, Huimin;Fan, Guangping;Tong, Fei;Chen, Wei;Liu, Lizhu;Li, Jiangye;Gao, Yan;Shi, Gaoling;Zhou, Huimin;Fan, Guangping;Tong, Fei;Chen, Wei;Liu, Lizhu;Li, Jiangye;Gao, Yan;Shi, Gaoling;Yi, Chao;Chen, Yinglong;Chen, Yinglong;Zhou, Dongmei

作者机构：

关键词： Cadmium; Wheat; Foliar zinc; Nanocarrier; Gene regulation; Sustainable production

期刊名称：ENVIRONMENTAL TECHNOLOGY & INNOVATION （ 影响因子：7.1； 五年影响因子：7.1 ）

ISSN： 2352-1864

年卷期： 2025 年 40 卷

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收录情况： SCI

摘要： Foliar zinc (Zn) application offers a promising strategy for cadmium (Cd) mitigation and Zn biofortification in wheat, while the poor leaf adhesion of conventional Zn formulations limits their effectiveness. This study utilized hydroxyapatite nanoparticles (nHAP) as a nanocarrier and prepared the nHAP-Zn complex through simple reactions. The complex exhibited superior leaf adhesion compared to ZnSO4 solution. Foliar application of nHAP-Zn increased grain Zn concentration by 38.8 % in the low-Cd-accumulating wheat cultivar Ningmai-11 (NM11) and 31.6 % in the high-Cd-accumulating cultivar Zhengmai-10 (ZM10), surpassing the effects of ZnSO4. Notably, nHAP-Zn decreased grain Cd concentration by 31.5 % in NM11 and 32.9 % in ZM10. Mechanistically, nHAP-Zn suppressed Cd uptake by downregulating the expression of TaNramp5, TaIRT1, and TaZIP5 genes in the roots, and inhibited Cd translocation from node Ito the grain by reducing xylem-to-phloem Cd transfer-related gene expression (i.e., TaHMA2, TaZIP3, and TaZIP7 in NM11, and TaHMA2, TaLCT1, TaZIP5, and TaZIP7 in ZM10). Furthermore, nHAP-Zn application did not compromise plant growth characteristics such as plant biomass and height. These findings highlight nHAP-Zn as a highly efficient foliar fertilizer for enhancing Zn biofortification while mitigating Cd accumulation in wheat cultivated in Cd-contaminated regions. This study presents a novel approach to improving wheat safety and nutritional quality.

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