Effects of rare earth oxide nanoparticles on root elongation of plants
Effects of rare earth oxide nanoparticles on root elongation of plants
复制标题
稀土氧化物纳米粒子对植物根系伸长的影响
DOI：
10.1016/j.chemosphere.2009.10.050
复制
发表时间：
2010-01-01
期刊：
影响因子：
8.8
通讯作者：
Chai, Zhifang
中科院分区：
文献类型：
--
作者：
Ma, Yuhui;Kuang, Linglin;Chai, Zhifang
采用根伸长法研究了纳米CeO 2、纳米La 2 O3、纳米Gd 2 O3和纳米Yb 2 O3 4种稀土氧化物纳米颗粒对萝卜、油菜、番茄、生菜、小麦、甘蓝和黄瓜7种高等植物的植物毒性。它们对根系生长的影响在不同纳米颗粒和植物物种之间差异很大。2000 mg L-1纳米CeO 2悬浮液对6种植物的根伸长没有影响，除了生菜。而2000 mg L-1的纳米La_2O_3、纳米Gd_2O_3和纳米Yb_2O_3悬浮液则严重抑制了7种植物的根伸长。纳米La_2O_3、纳米Gd_2O_3和纳米Yb_2O_3对植物生长的抑制作用在不同的生长过程中也存在差异。对小麦而言，抑制作用主要发生在种子孵化过程中，而对生菜和油菜而言，抑制作用既发生在种子浸泡过程中，也发生在种子孵化过程中。纳米氧化镧、纳米氧化钆和纳米氧化镱对油菜的半数抑制浓度（IC_（50））分别为40 mg L ~（-1）、20 mg L ~（-1）和70 mg L ~（-1）。在本研究中使用的浓度范围内，从纳米颗粒释放的RE 3+离子对根伸长的影响可以忽略不计。这些结果有助于理解稀土氧化物纳米颗粒的植物毒性。(C)2009爱思唯尔有限公司保留所有权利。
The phytotoxicity of four rare earth oxide nanoparticles, nano-CeO2, nano-La2O3, nano-Gd2O3 and nano-Yb2O3 on seven higher plant species (radish, rape, tomato, lettuce, wheat, cabbage, and cucumber) were investigated in the present study by means of root elongation experiments. Their effects on root growth varied greatly between different nanoparticles and plant species. A suspension of 2000 mg L-1 nano-CeO2 had no effect on the root elongation of six plants, except lettuce. On the contrary, 2000 mg L-1 suspensions of nano-La2O3, nano-Gd2O3 and nano-Yb2O3 severely inhibited the root elongation of all the seven species. Inhibitory effects of nano-La2O3, nano-Gd2O3, and nano-Yb2O3 also differed in the different growth process of plants. For wheat, the inhibition mainly took place during the seed incubation process, while lettuce and rape were inhibited on both seed soaking and incubation process. The fifty percent inhibitory concentrations (IC50) for rape were about 40 mg L-1 of nanO-La2O3, 20 mg L-1 of nano-Gd2O3, and 70 mg L-1 of nano-Yb2O3, respectively. In the concentration ranges used in this study, the RE3+ ion released from the nanoparticles had negligible effects on the root elongation. These results are helpful in understanding phytotoxicity of rare earth oxide nanoparticles. (C) 2009 Elsevier Ltd. All rights reserved.