纳米氧化铁对豇豆生长及其抗氧化系统的影响

Effect of Nano-iron Oxide on Growth of Cowpea Seedlings and Relevant Antioxidant Response

研究纳米氧化铁对豇豆幼苗的生理生长的影响。以豇豆为对象,从植物生理生长、根系活力、脂质过氧化作用以及抗氧化酶系的活力水平4个方面研究了不同浓度的纳米氧化铁对豇豆幼苗产生的影响,并以Fe^(2+)处理组作为对照研究纳米氧化铁对植物生长潜在的促进效应以及剂量依赖性,同时通过荧光显微镜观察荧光纳米氧化铁处理的豇豆幼苗以研究纳米粒子的转运。结果表明,不同浓度的纳米氧化铁对豇豆的生长发育有着不同的影响,低浓度的纳米氧化铁对豇豆幼苗的生长有一定的促进作用,高浓度的纳米氧化铁和Fe^(2+)对豇豆幼苗的生长有抑制作用,呈现出一定的植物毒性。豇豆根部对纳米氧化铁进行了吸收并运输到豇豆的茎部,并有一定含量的积累。纳米氧化铁可尝试应用于豇豆的农业生产活动,但在此之前须进一步开展其存在的环境、生态与人体健康风险研究。

In order to study the effects of iron oxide nanoparticles on the physiological growth of cowpea seedlings, taken a eowpea as tested objects,the effects of different contents of iron oxide nanoparticles on the production of cowpea seedlings in plant physiological growth, root activity,lipid peroxidation and the activity of antioxide enzyme were studied, Fe2＋ treatment was set as a positive control to research the effect of iron oxide nanoparticles on the potential promotion of cowpea seedling growth and its dose dependent, meanwhile eowpea seedlings treated with fluorescent iron oxide nanoparticle were observed by the fluorescent microscope. The result showed that the cowpea seedlings had differ- ent responses to iron oxide nanoparticles under various concentrations, the low concentration of iron oxide nanoparticles had some positive effects on cowpea seedlings, and the high concentration of iron oxide nanoparticles and Fe2 ~ partly inhibited the growth of cowpea seedlings and indicated a certain toxicity to plants. The iron oxide nanoparticle absorbed by the roots of cowpea and then transported to the stem of cowpea which subsequently accumulated to certain contents was found. It is possible that iron oxide nanoparticles are used as iron fertilizer in agricultural industry, but the risk of nanoparticles to the environment, ecology and human health must be studied first.