| 人工合成纳米TiO2和MWCNTs对玉米生长及其抗氧化系统的影响 |
| 摘要点击 2433 全文点击 3743 投稿时间：2009-02-06 修订日期：2009-09-07 |
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| 中文关键词 纳米材料 抗氧化酶活性 脂质过氧化 植物毒性 玉米 |
| 英文关键词 nanoparticle antioxidant enzyme activity lipid peroxidation phytotoxicity maize |
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| 中文摘要 |
| 通过营养液培养试验,研究了纳米金红石相TiO2和多壁碳纳米管(multiwalled carbon nanotubes,MWCNTs)2种人工合成纳米材料悬浮液对玉米幼苗生物量、根系形态、抗氧化酶活性和脂质过氧化的影响. 结果表明,在纳米材料悬浮液培养9 d后,纳米金红石相TiO2对玉米生长有显著抑制作用(p<0.05),50、100、200 mg/L浓度处理的植株根系干物质量分别比对照低40.31%、48.06%、62.02 %; 而MWCNTs |
| 英文摘要 |
| The effects of nano-rutile TiO2and multiwalled carbon nanotubes on the growth and antioxidant enzymes of maize (Zea mays L.) seedlings were investigated under hydroponic conditions. Nano-rutile TiO2(≥50 mg/L) significantly decreased root and shoot growth (p<0.05) after 9 days,while MWCNTs did not influence the biomass obviously. Under two stress conditions,the antioxidant system was activated respectively. Compared to the control,superoxide dismutase (SOD),peroxidase (POD) and catalase (CAT) were up-regulated (p<0.05). Lipid peroxidation in terms of malondialdehyde (MDA) content was enhanced by TiO2 exposure,whereas,MWCNTs did not cause oxidative damages in maize seedlings. The results indicated that the phytotoxicity of nano-rutile TiO2 was much higher than that of MWCNTs,and oxidative stress induced by nanoparticles(NPs) exposure might play a role in the phytotoxicity of NPs. The remarkable effect of nano-rutile TiO2 is probably attributed to particle composition and shape. |
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