文献类型：期刊文献

英文题名：Effects of SiO2 nanoparticles on root structures, gas exchange, and antioxidant activities of Cunninghamia lanceolata seedlings under drought stress

作者：Liu, Chen[1] Sun, Honggang[2] Xu, Yezhou[3] Wu, Chu[1]

第一作者：Liu, Chen

通信作者：Wu, C[1]

机构：[1]Yangtze Univ, Coll Hort & Gardening, Jingzhou, Hubei, Peoples R China;[2]Chinese Acad Forestry, Inst Subtrop Forestry Res, Hangzhou, Peoples R China;[3]Forestry Acad Hubei, Wuhan, Hubei, Peoples R China

年份：2023

外文期刊名：JOURNAL OF PLANT NUTRITION

收录：;Scopus(收录号：2-s2.0-85159315763);WOS:【SCI-EXPANDED(收录号:WOS:000989626100001)】；

基金：This work was supported by National Natural Science Foundation of China (Grant Number 31870378), the Central Research Institutes of Basic Research and Public Service Special Operations (CAFYBB2020ZB002), and the National Project of Key Research and Development (2016YFD0600302-4).

语种：英文

外文关键词：antioxidant enzymes; antioxidants; light use efficiency; root anatomy; root system architecture; water use efficiency

摘要：Increasing evidence shows that silicon possesses important physiological functions in plants, thus, silicon fertilizers are used widely in agriculture. However, few attentions were paid on the effects of silicon dioxide nanoparticles (SiO(2)NPs) on plant growth and resistance to abiotic stresses. In this present study, different amount of SiO(2)NPs were applied in pots with Cunninghamia lanceolata seedlings, and their root development, gas exchange, and drought resistance were investigated. These results showed that SiO(2)NPs treatment increased total root length, root volume, and the numbers of root tips of these seedlings under drought stress. Specific root area (SRA) and specific root length (SRL) also increased. SiO(2)NPs treatment altered anatomical structures of the first-order lateral roots of C. lanceolata seedlings under drought stress (i.e., increase in cortex thickness and the number of cortex layers). Under drought stress, SiO(2)NPs treatment increased net photosynthetic rates, stomatal conductance, intercellular CO2 concentration, and transpiration. SiO(2)NPs treatment also led to increase in light use efficiency and instantaneous Rubisco carboxylation rate and decrease in water use efficiency under drought stress. Under drought stress, SiO(2)NPs treatment resulted in increased activities of antioxidant enzymes (superoxide dismutase, catase, and peroxidase) and concentrations of antioxidants (ascorbate and glutathione), decreasing oxidative damage caused by drought stress. All together, these results suggested that SiO(2)NPs could be used for seedling culture of forest trees.