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Different Physiological and Biochemical Responses of Bamboo to the Addition of TiO<sub>2</sub> NPs under Heavy Metal Toxicity
oleh: Abolghassem Emamverdian, Yulong Ding, Farzad Mokhberdoran, Muthusamy Ramakrishnan, Zishan Ahmad, Yinfeng Xie
Format: | Article |
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Diterbitkan: | MDPI AG 2021-06-01 |
Deskripsi
Bamboo forests cover a remarkable area of Chinese forestland. Recently, titanium dioxide nanoparticles (TiO<sub>2</sub> NPs) have been used for plant protection against abiotic stress. In this study, an in vitro tissue culture experiment was conducted to determine the impact of titanium on plant tolerance to two different heavy metals (Cu and Pb). Bamboo plants (<i>Arundinaria pygmaea</i> L.) were grown using five concentrations of TiO<sub>2</sub> NPS (0, 50, 80, 100, and 150 µM) without or with 100 µM Cu and 100 µM Pb for 30 days. The results showed that while Cu and Pb increased the generation of Reactive oxygen species (ROS) compounds in plants, TiO<sub>2</sub> NP treatments played a positive role in reducing oxidative stress, as indicated by the decrease in ROS compounds, the extent of lipoperoxidation, and soluble proteins. On the other hand, the use of TiO<sub>2</sub> NPs increased the total antioxidant capacity, chlorophyll content and general plant biomass. Moreover, the addition of TiO<sub>2</sub> NPs significantly reduced Cu, and Pb accumulation in roots, stems, and shoots. We concluded that TiO<sub>2</sub> NPs have the ability to reduce oxidative stress in plants by increasing the antioxidant capacity, improving the level of injury, and protecting cell membranes via reducing lipoperoxidation (reduction of Malondialdehyde (MDA) content). However, the results indicated that the efficiency of TiO<sub>2</sub> NPs was related to the type and concentration of heavy metal, as TiO<sub>2</sub> NPs were more effective for Cu than Pb. Additionally, a high concentration of TiO<sub>2</sub> NPs resulted in the greatest enhancement in plant growth and development under heavy metal stress.