Wet Ecosystem Research Group, Department of Biological Sciences, North Dakota State University, Dept. 2715, PO Box 6050, Fargo, ND 58108-6050, USA.
Int J Phytoremediation. 2013;15(2):142-53. doi: 10.1080/15226514.2012.683209.
Bioavailability of engineered metal nanoparticles affects uptake in plants, impacts on ecosystems, and phytoremediation. We studied uptake and translocation of Ti in plants when the main source of this metal was TiO2 nanoparticles. Two crops (Phaseolus vulgaris (bean) and Triticum aestivum (wheat)), a wetland species (Rumex crispus, curly dock), and the floating aquatic plant (Elodea canadensis, Canadian waterweed), were grown in nutrient solutions with TiO2 nanoparticles (0, 6, 18 mmol Ti L(-1) for P. vulgaris, T. aestivum, and R. crispus; and 0 and 12 mmol Ti L(-1) for E. canadensis). Also examined in E. canadensis was the influence of TiO2 nanoparticles upon the uptake of Fe, Mn, and Mg, and the influence of P on Ti uptake. For the rooted plants, exposure to TiO2 nanoparticles did not affect biomass production, but significantly increased root Ti sorption and uptake. R. crispus showed translocation of Ti into the shoots. E. canadensis also showed significant uptake of Ti, P in the nutrient solution significantly decreased Ti uptake, and the uptake patterns of Mn and Mg were altered. Ti from nano-Ti was bioavailable to plants, thus showing the potential for cycling in ecosystems and for phytoremediation, particularly where water is the main carrier.
工程金属纳米颗粒的生物利用度会影响植物的吸收，对生态系统产生影响，并影响植物修复。当这种金属的主要来源是 TiO2 纳米颗粒时，我们研究了植物对 Ti 的吸收和转运。两种作物（菜豆和小麦）、一种湿地物种（皱叶酸模）和一种漂浮水生植物（加拿大水芹）在含有 TiO2 纳米颗粒的营养液中生长（0、6、18 mmol Ti L(-1)用于菜豆、小麦和皱叶酸模；0 和 12 mmol Ti L(-1)用于加拿大水芹）。还在加拿大水芹中研究了 TiO2 纳米颗粒对 Fe、Mn 和 Mg 吸收的影响，以及 P 对 Ti 吸收的影响。对于有根植物，暴露在 TiO2 纳米颗粒中不会影响生物量的产生，但会显著增加根 Ti 的吸附和吸收。皱叶酸模将 Ti 转运到地上部分。加拿大水芹也表现出对 Ti 的显著吸收，营养液中 P 的显著减少会降低 Ti 的吸收，并且 Mn 和 Mg 的吸收模式也会发生改变。纳米 Ti 中的 Ti 对植物是生物可利用的，因此表明它在生态系统中的循环和植物修复方面具有潜力，特别是在水是主要载体的情况下。
