Wang Yi, Deng Chaoyi, Cota-Ruiz Keni, Tan Wenjuan, Reyes Andres, Peralta-Videa Jose R, Hernandez-Viezcas Jose A, Li Chunqiang, Gardea-Torresdey Jorge L
Department of Chemistry and Biochemistry, The University of Texas at El Paso, 500 West University Avenue, El Paso, TX-79968, USA; University of California Centre for Environmental Implications of Nanotechnology, The University of Texas at El Paso, 500 West University Avenue, El Paso, TX-79968, USA.
Environmental Science and Engineering PhD Program, The University of Texas at El Paso, 500 West University Avenue, El Paso, TX-79968, USA; University of California Centre for Environmental Implications of Nanotechnology, The University of Texas at El Paso, 500 West University Avenue, El Paso, TX-79968, USA.
J Hazard Mater. 2021 Jan 15;402:123768. doi: 10.1016/j.jhazmat.2020.123768. Epub 2020 Aug 23.
The production and environmental release of surface-modified titanium dioxide nanoparticles (nTiO) have increased. Hence, crops may be directly exposed to the nTiO in soil. In this study, we grew carrots in soils amended with pristine, hydrophilic and hydrophobic surface-coated nTiO at 100, 200, and 400 mg kg until full-plant maturity. The content of Ti in plant secondary roots treated with different nTiO at 400 mg kg was in the order of hydrophobic > hydrophilic > pristine treatments, with values of 140.1, 100.5, and 64.3 mg kg, respectively. The fresh biomass of the taproot was significantly decreased by all nTiO forms at 400 mg kg by up to 56 %, compared to control. Pristine nTiO at 100 mg kg enhanced the fresh weight of leaves by 51 % with respect to control. Remarkably, an abnormal increase of taproot splitting was found in plants treated with all nTiO forms. In carrots treated with the surface-coated nTiO, the accumulation of Ca, Mg, Fe, and Zn increased in leaves; but Mg, Mn, and Zn decreased in taproots. These results suggest that future regulation of nTiO release into soils should consider its surface coating properties since the phytotoxicity effects depend on nTiO outer structure.
表面改性二氧化钛纳米颗粒（nTiO）的产量及其向环境中的释放量均有所增加。因此，农作物可能会直接接触到土壤中的nTiO。在本研究中，我们在添加了原始的、亲水性和疏水性表面包覆nTiO的土壤中种植胡萝卜，添加量分别为100、200和400 mg/kg，直至植株完全成熟。在400 mg/kg添加量下，不同nTiO处理的植物次生根中Ti含量顺序为：疏水性>亲水性>原始处理，其含量分别为140.1、100.5和64.3 mg/kg。与对照相比，400 mg/kg的所有nTiO形态均使主根的鲜生物量显著降低，降幅高达56%。100 mg/kg的原始nTiO使叶片鲜重相对于对照增加了51%。值得注意的是，所有nTiO形态处理的植株均出现主根开裂异常增加的情况。在用表面包覆nTiO处理的胡萝卜中，叶片中Ca、Mg、Fe和Zn的积累量增加；但主根中Mg、Mn和Zn的含量下降。这些结果表明，由于植物毒性效应取决于nTiO的外部结构，未来对nTiO向土壤中释放的监管应考虑其表面包覆特性。
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