[目的]研究不同浓度纳米氧化铁对西瓜幼苗生长的影响.[方法]采用不同浓度纳米氧化铁对西瓜幼苗进行处理后,对植株根系生物量、抗氧化酶活性等进行测定.对比不同粒径纳米氧化铁对西瓜叶片影响的研究,比较纳米处理对植株地上地下部分影响的差异.[结果]不同浓度的纳米氧化铁对西瓜根系生长有影响,低浓度时对植株生长起促进作用,高浓度时促进作用减弱或起抑制效果,呈现出一定的植物毒性.[结论]低浓度的纳米氧化铁有利于植物的生长,在弄清剂量、毒性及尺寸效应的基础上,有望将纳米氧化铁作为纳米肥料或植物生长调节剂用于农业生产上.%[Objective] The research was designed to evaluate the influence of γ-Fe203 NPs with different concentration on the growth of watermelon seedlings.[Method] Root biomass and antioxidant enzyme activity were measured in plants exposed to different concentrations of γ-Fe203 NPs.By comparing the results with the impact on leaves of watermelon of γ-Fe203 NPs with different particle size,different impact on aerial and underground part of watermelon seedlings was also discussed.[Result] Effects of γ-Fe203 NPs were related with concentration.The effects of γ-Fe2 03 NPs at lower concentration was positive on plant growth,while at high concentration the effects were weakened or inhibited,which presented phytotoxicity.[Conclusion] Low concentration of γ-Fe2 03 NPs has positive effects on plant growth.Based on further undemtanding of dose,toxicity and size effects,γ-Fe2O3NPs are expected to be used as a nano-fertilizer or plant growth regulator in agricultural production.
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