College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha, 410004, China.
College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha, 410004, China; Hunan Engineering Laboratory for Control of Rice Quality and Safety, Central South University of Forestry and Technology, Changsha, 410004, China.
Chemosphere. 2021 Aug;276:130212. doi: 10.1016/j.chemosphere.2021.130212. Epub 2021 Mar 9.
Rice as a paddy field crops, iron-containing materials application could induce its iron plaque formation, thereby affecting cadmium (Cd) transportation in the rhizosphere and its uptake in root. In this study, a hydroponic experiment was conducted to investigate the effects of three exogenous iron materials, namely nano-FeO-modified biochar (BC-Fe), chelated iron (EDTA-Fe), and ferrous sulfate (FeSO), on the iron plaque formation on the surface of rice root, and to investigate the effects of formed iron plaque on the absorption, migration, and transportation of Cd and Fe in rice plant. The results showed that yellow-brown and brown iron plaque was formed on surface cells of the Fe-treated rice root, and some black particles were embedded in the iron plaque formed by BC-Fe. The proportion of crystallized iron plaque (31.8%-35.9%) formed by BC-Fe was much higher than that formed by EDTA-Fe and FeSO. The Cd concentrations in the crystallized iron plaque formed by BC-Fe were 7.64-13.0 mg·kg, and increased with the increasing of Fe concentrations in the plaque. The Cd translocation factor from root to stem (TF) and the Cd translocation factor from stem to leaf (TF) with BC-Fe treatment decreased by 84.7% and 80.0%, respectively. The results demonstrated that application BC-Fe promoted the formation of iron plaque and enhanced the sequestration of Cd and Fe in roots, thus reduced the transportation and accumulation of Cd in aerial rice tissues.
水稻作为一种水田作物，施加含铁材料会诱导其形成铁斑，从而影响根际镉的迁移及其在根部的吸收。本研究通过水培实验，研究了三种外源铁材料（纳米 FeO 修饰生物炭（BC-Fe）、螯合铁（EDTA-Fe）和硫酸亚铁（FeSO））对水稻根表面铁斑形成的影响，并探讨了形成的铁斑对水稻吸收、迁移和转运 Cd 和 Fe 的影响。结果表明，Fe 处理的水稻根表面细胞形成了黄棕色和棕色铁斑，一些黑色颗粒嵌入了 BC-Fe 形成的铁斑中。BC-Fe 形成的结晶态铁斑（31.8%-35.9%）比例远高于 EDTA-Fe 和 FeSO 形成的铁斑。BC-Fe 形成的结晶态铁斑中 Cd 浓度为 7.64-13.0mg·kg，随铁斑中 Fe 浓度的增加而增加。BC-Fe 处理后，根到茎的 Cd 迁移因子（TF）和茎到叶的 Cd 迁移因子（TF）分别降低了 84.7%和 80.0%。结果表明，BC-Fe 的施用促进了铁斑的形成，增强了根对 Cd 和 Fe 的螯合固定，从而减少了 Cd 在水稻地上部组织中的迁移和积累。
