351. EFFECTS OF FOLIAR APPLICATION WITH NANO-IRON MATERIALS ON CD TOXICITY IN RICE SEEDLINGS.
- Author
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Yaoyao Wang, Kexiang Wang, Peiye Li, Xuemin Zhang, Zehao Xu, Yi Hao, and Yukui Rui
- Abstract
Previous studies have shown that Fe
2 O3 nanoparticles (Fe2 O3 NPs) may be a potential form of fertilizer utilization. In recent years, heavy metal such as cadmium (Cd) pollution has become increasingly severe. The effects of Fe2 O3 NPs on plant Cd absorption were not well understood. The aim of this study was to explore the effect of Fe2 O3 NPs on the absorption of Cd by rice seedlings. In the present study, Fe2 O3 NPs were sprayed on the leaves of rice seedlings (Hybrid Rice Y Liangyou 900) under hydroponic conditions with 50µM CdCl2 . There were two series of spraying treatments, namely Fe2 O3 NPs and FeCl3 bulk materials, and 4 kinds of concentrations (i.e., 0, 20, 50, 100 mg/L). The results showed that the addition of exogenous Cd2+ to the nutrient solution inhibited the growth of rice seedlings, which was reflected in dwarf plants, underdeveloped roots, and chlorotic leaves. Foliar application of FeCl3 and Fe2 O3 NPs materials aggravated the inhibition of Cd2+ on rice seedling growth, resulting in further reduction of plant height. But the negative effects were more obvious especially at 50 mg/L FeCl3 ; Cadmium stress caused damage to DNA, which was manifested in the increase of 8-hydroxydesoxiguanosine (8-OHdG) content. Foliar application of two kinds of iron materials partially reduced the DNA damage of cadmium to shoot, and the mitigating effect of Fe2 O3 NPs was more obvious than FeCl3 . [ABSTRACT FROM AUTHOR]- Published
- 2018