School of Life Sciences, Shandong University of Technology, Zibo, Shandong, 255000, China.
School of Agricultural Engineering and Food Science, Shandong University of Technology, Zibo, 255000, China.
Ecotoxicol Environ Saf. 2019 Sep 15;179:265-271. doi: 10.1016/j.ecoenv.2019.04.074. Epub 2019 May 3.
The content of gadolinium (Gd) is continuously increased in environment, which potentially threatens human health and ecological equilibrium. However, the phytotoxicity of Gd on plants remains unknown until now. In this study, the accumulation, distribution, and chemical forms of Gd as well as its influence on growth and nutrient balance were systematically studied in rice seedlings after the treatments of different concentrations of Gd (0, 1, 10, 100, and 1000 μM) for 10 days. The results showed that most Gd was accumulated in the roots and only a little percentage of Gd was transported to shoots. The accumulation of Gd was increased in a dose-dependent manner in various chemical forms and subcellular fractions. More than 80% of Gd was in the forms of insoluble oxalates and phosphates. Gd was mainly compartmentalized in the cell wall, and the content of Gd was increased with increasing concentrations of Gd. In addition, hormetic effects of Gd were found on rice growth. The growth of rice was induced by the lower concentration of Gd, but inhibited by the higher concentration of Gd. The results indicated that rice seedlings could cope with Gd toxicity through cell wall compartmentalization as well as forming of precipitates with oxalate and phosphate.
钆（Gd）的含量在环境中不断增加，这可能对人类健康和生态平衡构成威胁。然而，目前为止，Gd 对植物的植物毒性仍不清楚。在这项研究中，用不同浓度的 Gd（0、1、10、100 和 1000μM）处理水稻幼苗 10 天后，系统研究了 Gd 的积累、分布和化学形态，以及其对生长和养分平衡的影响。结果表明，大部分 Gd 积累在根部，只有一小部分 Gd 被转运到地上部。Gd 以剂量依赖的方式在各种化学形态和亚细胞组分中积累。超过 80%的 Gd 以不溶性草酸盐和磷酸盐的形式存在。Gd 主要定位于细胞壁中，且随着 Gd 浓度的增加而增加。此外，还发现 Gd 对水稻生长具有兴奋效应。较低浓度的 Gd 诱导水稻生长，但较高浓度的 Gd 则抑制其生长。结果表明，水稻幼苗可以通过细胞壁隔离以及与草酸盐和磷酸盐形成沉淀来应对 Gd 毒性。
