数字农科院2.0

Foliar cadmium uptake, transfer, and redistribution in Chili: A comparison of foliar and root uptake, metabolomic, and contribution

文献类型： 外文期刊

作者： Xiaoxue Ouyang;Jie Ma;Yong Liu;Pan Li;Rongfei Wei;Qiusheng Chen;Liping Weng;Yali Chen;Yongtao Li

作者机构：

关键词： Cadmium;Cadmium isotope;Metabolomics;NanoSIMS;Phytotoxicity;Uptake pathway

期刊名称： Journal of Hazardous Materials

ISSN： 0304-3894

年卷期： 2023 年 453 卷

页码：

收录情况： SCIE（2023版） ; ; EI（2023版）

摘要： Atmospheric deposition is an essential cadmium (Cd) pollution source in agricultural ecosystems, entering crops via roots and leaves. In this study, atmospherically deposited Cd was simulated using cadmium sulfide nanoparticles (CdSN), and chili (Capsicum frutescens L.) was used to conduct a comparative foliar and root experiment. Root and foliar uptake significantly increased the Cd content of chili tissues as well as the subcellular Cd content. Scanning electron microscopy and high-resolution secondary ion mass spectrometry showed that Cd that entered the leaves via stomata was fixed in leaf cells, and the rest was mainly through phloem transport to the other organs. In leaf, stem, and root cell walls, Cd signal intensities were 47.4%, 72.2%, and 90.0%, respectively. Foliar Cd uptake significantly downregulated purine metabolism in leaves, whereas root Cd uptake inhibited stilbenoid, diarylheptanoid, and gingerol biosynthesis in roots. Root uptake contributed 90.4% Cd in fruits under simultaneous root and foliar uptake conditions attributed to xylem and phloem involvement in Cd translocation. Moreover, root uptake had a more significant effect on fruit metabolic pathways than foliar uptake. These findings are critical for choosing pollution control technologies and ensuring food security.

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