文献类型：期刊文献

英文题名：Nitrogen Application Promotes Drought Resistance of Toona Sinensis Seedlings

作者：Yu, Xiaochi[1,2] He, Runhua[3] Yi, Fei[4] Liu, Ying[2] Zhang, Peng[1] Wang, Junhui[2] Ma, Wenjun[2]

第一作者：Yu, Xiaochi

机构：[1] Forestry College, Northeast Forestry University, Harbin, 150040, China; [2] State Key Laboratory of Tree Genetics and Breeding, Key Laboratory of Tree Breeding and Cultivation of National Forestry and Grassland Administration, Research Institute of Forestry, Chinese Academy of Forestry, Beijing, 100091, China; [3] Hunan Botanical Garden, Changsha, 410116, China; [4] College of Biological and Pharmaceutical Sciences, Three Gorges University, Yichang, 443002, China

年份：2022

外文期刊名：SSRN

收录：EI(收录号：20220330264)

语种：英文

外文关键词：Drought - Moisture determination - Morphology - Physiological models - Plants (botany) - Seed - Soil moisture - Superoxide dismutase

摘要：A greenhouse experiment was carried out to explore the influential mechanisms of nitrogen (N) application on the drought response of one-year old Toona sinensis seedlings. A factorial design consisting of four N treatments (0, 1, 2 and 4 g N·plant-1) combined with two water conditions: drought (D=25±5% soil moisture content) and well-watered (W=65±5% soil moisture content) were used. On the whole, the effects of N applications on seedling growth and physiological parameters varied among different water treatments. For example, the total biomass of T. sinensis seedlings were significantly decreased under drought conditions, while the biomass were was promoted under the application of N fertilizer and showed the highest value when 2~4 g N·plant-1 was applied. Under drought conditions, the root length and root surface area of T. sinensis increased, and the transpiration rate decreased; N application improved the above root morphological changes and increased photosynthesis. The activities of antioxidant enzymes such as superoxide dismutase (Superoxide Dismutase: SOD; EC1.15.1.1) and peroxidase (Peroxidase: POD; EC1.11.1.7) and the contents of osmotic adjustment substances such as soluble sugar and proline increased upon drought stress, while these traits all decreased under N application conditions. Overall, N application alleviated the negative effects of drought stress on T. sinensis seedlings by adjusting root morphology and improving photosynthetic capacity, and these adaptations offset some of the need for antioxidants. ? 2022, The Authors. All rights reserved.