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

文献类型： 外文期刊

作者： Hao, Yubo 1 ; Yu, Yang 1 ; Sun, Guangyan 2 ; Gong, Xiujie 1 ; Jiang, Yubo 1 ; Lv, Guoyi 1 ; Zhang, Yiteng 1 ; Li, Liang 1 ; Zhao, Yang 1 ; Sun, Dan 3 ; Gu, Wanrong 2 ; Qian, Chunrong 1 ;

作者机构： 1.Heilongjiang Acad Agr Sci, Inst Crop Cultivat & Tillage, Harbin 150028, Peoples R China

2.Northeast Agr Univ, Coll Agr, Harbin 150030, Peoples R China

3.Heilongjiang Acad Agr Sci, Inst Crop Resource, Harbin 150086, Peoples R China

关键词： maize; multi-walled carbon nanotubes; nano-silica

期刊名称：PLANTS-BASEL （ 影响因子：4.5； 五年影响因子：4.8 ）

ISSN：

年卷期： 2023 年 12 卷 8 期

页码：

收录情况： SCI

摘要： 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 center dot L-1, 200 mg center dot L-1, 400 mg center dot L-1, 800 mg center dot L-1 and 1200 mg center dot L-1) and nano-SiO2 (0 mg center dot L-1, 150 mg center dot L-1, 800 mg center dot L-1, 1500 mg center dot L-1 and 2500 mg center dot 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 center dot L-1 and nano-SiO2 with 1500 mg center dot 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 O(2)Greek ano teleia(-) 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 species and maintain the complete structure of cells, so as to slow down plant aging. The promoting effect of MWCNTs treated with 800 mg center dot L-1 and nano-SiO2 treated with 1500 mg center dot L-1 had the best effect. After treatment with MWCNTs and nano-SiO2, the activities of key photosynthesis enzymes PEPC, Rubisco, NADP-ME, NADP-MDH and PPDK of maize seedlings increased, which promoted the opening of stomata, improved the fixation efficiency of CO2, improved the photosynthetic process of maize plants and promoted plant growth. The promoting effect was the best when the concentration of MWCNTs was 800 mg center dot L-1 and the concentration of nano-SiO2 was 1500 mg center dot L-1. MWCNTs and nano-SiO2 can increase the activities of the enzymes GS, GOGAT, GAD and GDH related to nitrogen metabolism in maize leaves and roots, and can increase the content of pyruvate, so as to promote the synthesis of carbohydrates and the utilization of nitrogen and promote plant growth.

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