科研之友
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摘要
Due to the widespread use of silver nanoparticles (nAg) in different products, the possibility of their leakage into the environment has been increasing. It is, therefore, crucial to study the possible effects of nAg on plants as the key components of ecosystems. In the present study, the effects of different concentrations of colloidal nAg on sweet maize were investigated at the anatomic level. Using dynamic light scattering and electron microscopy, the size of the nAg was estimated less than 80 nm. After one week of treatment, thin cross sections of roots and shoots were prepared and studied by light and fluorescence microscopes. Results showed that cortex and vascular cylinder area of roots and shoots of treated plants significantly (P<0.05) decreased versus control. Significant (P<0.05) reduction in diameter of metaxylem vessels was also identified. In addition, deform cells and Ag accumulations in root tissues of treated seedlings were observed. The results of this study indicate that nAg can enter into plant root and make considerable adverse effects on the plant root anatomy suggesting that nAg can become a future emerging pollutant.
- 出版日期2018
