钙相关阴离子在调节小麦对镉的吸收和转移中发挥双重作用

Mahboobe Safari Sinegani, Maria Manzoor, K. H. Mühling
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引用次数: 0

摘要

镉在小麦这种日常食物中的积累,即使浓度很低,也会对人类健康造成严重威胁。由于土壤条件复杂,以往的研究在钙处理对植物镉吸收和转运的影响方面报告了相互矛盾的结果。我们的水培研究更清楚地揭示了特定的钙处理参数如何影响小麦对镉的吸收和转运。水培培养基受到镉(CdCl2)污染,并进行了以下处理:CaCO3、CaSO4、CaCl2、CaCO3 + CaSO4、CaCO3 + CaCl2 和 CaSO4 + CaCl2。收获后,分析小麦对 Cd2+ 的吸收特性,包括转运因子、生物富集因子和吸收量。此外,还测定了生理生长参数和植物养分。与镉对照相比,施用 CaCO3 能明显降低小麦的 Cd2+ 浓度,CaCO3 + CaSO4 处理是对照的三倍,CaCO3 + CaCl2 处理是对照的两倍。这项研究清楚地阐明,pH 值和 CO32- 是降低小麦中 Cd2+ 浓度的关键。SO42-、Cl- 和 Ca2+ 对 Cd2+ 浓度没有影响。Ca2+ 只降低了植物体内 Cd2+ 的易位因子(TF)。CaCO3 还降低了镉对 Mg2+、Mn2+ 和 Cu2+ 吸收的干扰。因此,这项研究为钙处理对控制植物镉污染的纯粹影响提供了新的见解,而不受土壤影响的影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Calcium-Associated Anions Play a Dual Role in Modulating Cadmium Uptake and Translocation in Wheat
Cadmium accumulation in wheat as a daily food, even in low concentrations, is a serious threat to human health. Previous studies have reported conflicting results on the impact of calcium treatments on cadmium uptake and translocation in plants due to the complex soil conditions. Our hydroponic study offers clearer insights into how specific calcium treatment parameters influence cadmium uptake and translocation in wheat. The hydroponic medium was contaminated by cadmium (CdCl2) and the following treatments were applied: CaCO3, CaSO4, CaCl2, CaCO3 + CaSO4, CaCO3 + CaCl2, and CaSO4 + CaCl2. After harvesting, the wheat was analyzed for Cd2+ uptake characteristics including translocation factor, bioconcentration factor, and uptake. Furthermore, physiological growth parameters and plant nutrients were also determined. Applying CaCO3 significantly decreased wheat Cd2+ concentration by about three times in CaCO3 and two times in CaCO3 + CaSO4 and CaCO3 + CaCl2 treatments than in Cd-control. This study clearly elucidates that pH and CO32− were crucial in reducing Cd2+ concentration in wheat. SO42−, Cl−, and Ca2+ showed no effect on Cd2+ concentration. Ca2+ only reduced the translocation factor (TF) of Cd2+ in plants. CaCO3 also declined cadmium interference in the Mg2+, Mn2+, and Cu2+ uptake. Therefore, this study provides novel insight into the pure effects of calcium treatments on controlling cadmium contamination in plants, independent of soil effect.
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