Răcuciu Mihaela, Tecucianu Andreea, Oancea Simona
Environmental Sciences and Physics Department, Faculty of Sciences, Lucian Blaga University of Sibiu, Dr. I. Ratiu Street, No. 5-7, 550012 Sibiu, Romania.
Dacia Plant Company, Harmanului Str., Bot, 507015 Brașov, Romania.
Antioxidants (Basel). 2022 Jun 17;11(6):1193. doi: 10.3390/antiox11061193.
In recent decades, magnetite nanoparticles received greater attention in nanobiotechnology due to wide applications. This study presents the influence of the oxidative stress caused by magnetite nanoparticles coated with aspartic acid (A-MNP) of 9.17 nm mean diameter size, on maize ( seedlings, in terms of growth, enzymatic activity and chlorophyll content as evaluated in exposed plant tissues. Diluted suspensions of colloidal magnetite nanoparticles stabilized in water were added to the culture medium of maize seeds, such as to equate nanoparticle concentrations varying from 0.55 mg/L to 11 mg/L. The obtained results showed that the growth of maize was stimulated by increasing the level of A-MNPs. Plant samples treated with different concentrations of A-MNP proved increased activities of catalase and peroxidase, and chlorophyll content, as well. The exposure of plants to magnetite nanoparticles may induce oxidative stress, which activates the plant defense/antioxidant mechanisms.
近几十年来，由于广泛的应用，磁铁矿纳米颗粒在纳米生物技术中受到了更多关注。本研究展示了平均直径为9.17纳米的天冬氨酸包覆磁铁矿纳米颗粒（A-MNP）所引起的氧化应激对玉米幼苗生长、酶活性和叶绿素含量的影响，这些指标是在暴露的植物组织中评估得出的。将稳定在水中的胶体磁铁矿纳米颗粒稀释悬浮液添加到玉米种子的培养基中，使纳米颗粒浓度在0.55毫克/升至11毫克/升之间变化。所得结果表明，增加A-MNPs的水平会刺激玉米的生长。用不同浓度的A-MNP处理的植物样品显示过氧化氢酶和过氧化物酶的活性增加，叶绿素含量也增加。植物暴露于磁铁矿纳米颗粒可能会诱导氧化应激，从而激活植物防御/抗氧化机制。
