Lin Daohui, Xing Baoshan
Department of Environmental Science, Zhejiang University, Hangzhou 310028, China.
Environ Pollut. 2007 Nov;150(2):243-50. doi: 10.1016/j.envpol.2007.01.016. Epub 2007 Mar 19.
Plants need to be included to develop a comprehensive toxicity profile for nanoparticles. Effects of five types of nanoparticles (multi-walled carbon nanotube, aluminum, alumina, zinc, and zinc oxide) on seed germination and root growth of six higher plant species (radish, rape, ryegrass, lettuce, corn, and cucumber) were investigated. Seed germination was not affected except for the inhibition of nanoscale zinc (nano-Zn) on ryegrass and zinc oxide (nano-ZnO) on corn at 2000 mg/L. Inhibition on root growth varied greatly among nanoparticles and plants. Suspensions of 2000 mg/L nano-Zn or nano-ZnO practically terminated root elongation of the tested plant species. Fifty percent inhibitory concentrations (IC50) of nano-Zn and nano-ZnO were estimated to be near 50mg/L for radish, and about 20mg/L for rape and ryegrass. The inhibition occurred during the seed incubation process rather than seed soaking stage. These results are significant in terms of use and disposal of engineered nanoparticles.
为了建立纳米颗粒全面的毒性特征，需要纳入植物进行研究。研究了五种纳米颗粒（多壁碳纳米管、铝、氧化铝、锌和氧化锌）对六种高等植物（萝卜、油菜、黑麦草、生菜、玉米和黄瓜）种子萌发和根系生长的影响。在2000毫克/升时，除了纳米级锌（nano-Zn）对黑麦草以及氧化锌（nano-ZnO）对玉米种子萌发有抑制作用外，其他纳米颗粒对种子萌发没有影响。纳米颗粒和植物之间对根系生长的抑制差异很大。2000毫克/升的nano-Zn或nano-ZnO悬浮液实际上终止了受试植物物种的根伸长。纳米锌和纳米氧化锌对萝卜的半数抑制浓度（IC50）估计接近50毫克/升，对油菜和黑麦草约为20毫克/升。抑制作用发生在种子培养过程中，而不是种子浸泡阶段。这些结果对于工程纳米颗粒的使用和处置具有重要意义。
