文章基本信息

标题：Phytotoxic Mechanism of Nanoparticles: Destruction of Chloroplasts and Vascular Bundles and Alteration of Nutrient Absorption
本地全文：下载
作者：Le Van Nhan ; Chuanxin Ma ; Yukui Rui 等
期刊名称：Scientific Reports
电子版ISSN：2045-2322
出版年度：2015
卷号：5
DOI：10.1038/srep11618
出版社：Springer Nature
摘要：This study focused on determining the phytotoxic mechanism of CeO₂ nanoparticles (NPs): destroying chloroplasts and vascular bundles and altering absorption of nutrients on conventional and Bt-transgenic cottons. Experiments were designed with three concentrations of CeO₂ NPs including: 0, 100 and 500 mg·L⁻¹, and each treatment was three replications. Results indicate that absorbed CeO₂ nanoparticles significantly reduced the Zn, Mg, Fe, and P levels in xylem sap compared with the control group and decreased indole-3-acetic acid (IAA) and abscisic acid (ABA) concentrations in the roots of conventional cotton. Transmission electron microscopy (TEM) images revealed that CeO₂ NPs were absorbed into the roots and subsequently transported to the stems and leaves of both conventional and Bt-transgenic cotton plants via xylem sap. In addition, the majority of aggregated CeO₂ NPs were attached to the external surface of chloroplasts, which were swollen and ruptured, especially in Bt-transgenic cotton. The vascular bundles were destroyed by CeO₂ nanoparticles, and more damage was observed in transgenic cotton than conventional cotton.