Metallic Nanoparticle (TiO2 and Fe3O4) Application Modifies Rhizosphere Phosphorus Availability and Uptake by Lactuca sativa

详细信息    查看全文

• 作者：Zahra Zahra ; Muhammad Arshad ; Rafia Rafique ; Arshad Mahmood ; Amir Habib ; Ishtiaq A. Qazi ; Saud A. Khan
• 刊名：Journal of Agricultural and Food Chemistry
• 出版年：2015
• 出版时间：August 12, 2015
• 年：2015
• 卷：63
• 期：31
• 页码：6876-6882
• 全文大小：420K
• ISSN：1520-5118

文摘

Application of engineered nanoparticles (NPs) with respect to nutrient uptake in plants is not yet well understood. The impacts of TiO₂ and Fe₃O₄ NPs on the availability of naturally soil-bound inorganic phosphorus (P_i) to plants were studied along with relevant parameters. For this purpose, Lactuca sativa (lettuce) was cultivated on the soil amended with TiO₂ and Fe₃O₄ (0, 50, 100, 150, 200, and 250 mg kg^鈥?) over a period of 90 days. Different techniques, such as scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), Raman, and Fourier transform infrared spectroscopy (FTIR) were used to monitor translocation and understand the possible mechanisms for phosphorus (P) uptake. The trends for P accumulation were different for roots (TiO₂ > Fe₃O₄ > control) and shoots (Fe₃O₄ > TiO₂ > control). Cystine and methionine were detected in the rhizosphere in Raman spectra. Affinities of NPs to adsorb phosphate ions, modifications in P speciation, and NP stress in the rhizosphere had possibly contributed to enhanced root exudation and acidification. All of these changes led to improved P availability and uptake by the plants. These promising results can help to develop an innovative strategy for using NPs for improved nutrient management to ensure food security.