不同粒径纳米羟基磷灰石吸附镉对水稻幼苗生长的毒性效应
Toxic effect of cadmium adsorbed by different sizes of nano-hydroxyapatite on the growth of rice seedlings.
作者信息
Huang Yifan, Qiu Weiwen, Yu Zhihong, Song Zhengguo
机构信息
Agro-environmental Protection Institute, Ministry of Agriculture, Key Laboratory of Production Environment Quality, Ministry of Agriculture of China, Tianjin, 300191, China.
The New Zealand Institute for Plant and Food Research Limited, Private Bag 4704, Christchurch, 8140, New Zealand.
出版信息
Environ Toxicol Pharmacol. 2017 Jun;52:1-7. doi: 10.1016/j.etap.2017.03.005. Epub 2017 Mar 14.
Information regarding the toxic effects of cadmium (Cd) adsorbed by nano-hydroxyapatite (NHAP-Cd) on the growth of crop plants remain limited. We investigated the mechanism of NHAP-Cd (diameters, 20 and 40nm; NHAP-Cd and NHAP-Cd, respectively) phytotoxicity. Rice seedlings treated with Cd and NHAP-Cd showed more severe growth retardation compared to those treated with NHAP-Cd, for the same Cd concentration. Transmission electron microscopy revealed NHAP in the seedlings. The nanoparticles entered the rice seedlings with no Cd signals in the NHAP treatments compared to -0.47pmolcms of Cd fluxes in the Cd treatment. The higher Cd content in the leaves and mesocotyl of NHAP-Cd-treated rice seedlings suggested that smaller NHAP-Cd can translocate easily to the aboveground parts. Further, NHAP-Cd increased oxidative stress, which was determined as catalase activity changes in this study. Thus, NHAP-Cd particles in the growth medium can be transported to rice seedlings and cause toxicity.
关于纳米羟基磷灰石吸附镉（NHAP-Cd）对农作物生长的毒性作用的信息仍然有限。我们研究了NHAP-Cd（直径分别为20和40nm；分别为NHAP-Cd和NHAP-Cd）的植物毒性机制。在相同镉浓度下，与用NHAP-Cd处理的水稻幼苗相比，用镉和NHAP-Cd处理的水稻幼苗表现出更严重的生长迟缓。透射电子显微镜显示幼苗中有NHAP。与镉处理中-0.47pmol/cm²的镉通量相比，在NHAP处理中纳米颗粒进入水稻幼苗且没有镉信号。用NHAP-Cd处理的水稻幼苗叶片和中胚轴中较高的镉含量表明较小的NHAP-Cd可以很容易地转运到地上部分。此外，NHAP-Cd增加了氧化应激，在本研究中氧化应激通过过氧化氢酶活性变化来确定。因此，生长培养基中的NHAP-Cd颗粒可以转运到水稻幼苗并造成毒性。
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