Effects of Multi-Walled Carbon Nanotubes and Nano-Silica on Root Development, Leaf Photosynthesis, Active Oxygen and Nitrogen Metabolism in Maize

作者：Yubo Hao, Yang Yu, Guangyan Sun, Xiujie Gong, Yubo Jiang, Guoyi Lv, Yiteng Zhang, Liang Li, Yang Zhao, Dan Sun, Wanrong Gu, Chunrong Qian · 发表于：Plants · 年份：2023 · DOI：10.3390/plants12081604 · 被引用次数：43 · 研究领域：Plant responses to water stress、Plant Stress Responses and Tolerance、Silicon Effects in Agriculture

Carbon nanotubes (MWCNTs) and nano-silica (nano-SiO2) are widely used in the field of life science because of their special physical and chemical properties. In this study, the effects of different concentrations of MWCNTs (0 mg·L−1, 200 mg·L−1, 400 mg·L−1, 800 mg·L−1 and 1200 mg·L−1) and nano-SiO2 (0 mg·L−1, 150 mg·L−1, 800 mg·L−1, 1500 mg·L−1 and 2500 mg·L−1) on maize seedling growth and relative mechanisms were explored. The main results are as follows: MWCNTs and nano-SiO2 can promote the growth of maize seedlings, and promote plant height, root length, the dry and fresh weight of seedlings, root–shoot ratio and so on. The ability to accumulate dry matter increased, the relative water content of leaves increased, the electrical conductivity of leaves decreased, the stability of cell membranes improved and the water metabolism ability of maize seedlings increased. The treatment of MWCNTs with 800 mg·L−1 and nano-SiO2 with 1500 mg·L−1 had the best effect on seedling growth. MWCNTs and nano-SiO2 can promote the development of root morphology, increase root length, root surface area, average diameter, root volume and total root tip number and improve root activity, so as to improve the absorption capacity of roots to water and nutrition. After MWCNT and nano-SiO2 treatment, compared with the control, the contents of O2·− and H2O2 decreased, and the damage of reactive oxygen free radicals to cells decreased. MWCNTs and nano-SiO2 can promote the clearance of reactive oxygen spe...