氧化铁纳米粒子对玉米生理效应影响的研究

为了有效地评估纳米粒子对植物潜在的生物毒性，选取玉米和氧化铁纳米粒子为研究对象，探讨氧化铁纳米粒子（nailo-Fe2O3）对玉米生理效应的影响。同时，测定抗氧化酶体系的酶活性和丙二醛（MDA）含量，结果表明当受到氧化铁纳米粒子胁迫时，玉米会发生氧化应激反应，但这会激发玉米本身的保护机制，导致整个机体的抗氧化预防能力增强，使得机体的超氧阴离子自由基含量降低，减少对机体的损害。同时，通过玉米根的荧光切片和透射电镜切片，可以得出氧化铁纳米粒子从上皮层运输到皮质层主要是通过质外体途径．并且能够进入玉米细胞中、、这些为评估纳米粒子对植物的影响奠定基础。

Physiological Effects of Iron Oxide Nanoparticles towards Corns

In order to evaluate the potential biotoxicity of nanoparticles towards plants, choosing corns anti iron oxide nanoparticles （ nann - Fe2O3 ） as objects, the physiological effects of iron oxide nanoparticles towards corns were discussed. The activity of antioxidant enzymes and the contents of malondiadehyde （MDA） were measured. The results indicated that oxidative stress happened in the plant treated with iron ox- ide nanoparticles, which can stimulate the self-protection mechanism of plants and reduce the damages of body because of the decrease of so- peroxide radical. The fluorescent images and transmission electron microscopy images of plant roots showed iron oxide uanoparticlcs transport between cell to cell from epidermis to endodermis by the apuplastic pathway and can penetrate into the cell of corns. These will lay foundations tbr evaluating the effects of nanoparticles towards plants.