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

通信作者：Ma, WJ[1]

机构：[1]Northeast Forestry Univ, Forestry Coll, Harbin 150040, Peoples R China;[2]Chinese Acad Forestry, Res Inst Forestry, State Key Lab Tree Genet & Breeding, Beijing 100091, Peoples R China;[3]Hunan Bot Garden, Changsha 410116, Peoples R China;[4]Three Gorges Univ, Coll Biol & Pharmaceut Sci, Yichang 443002, Peoples R China

年份：2024

卷号：15

期号：8

外文期刊名：FORESTS

收录：;EI(收录号：20243616971150);Scopus(收录号：2-s2.0-85202685742);WOS:【SCI-EXPANDED(收录号:WOS:001307057400001)】；

基金：This research work was funded by the National Key R&D Program of China (2021YFD2200305). Therefore, the authors gratefully acknowledge the Chinese Academy of Forestry Sciences.

语种：英文

外文关键词：Toona sinensis; drought resistance; nitrogen application; root morphology; photosynthetic; antioxidant

摘要：A factorial design consisting of four N treatments (no N fertilization, 0.70, 0.14, and 0.28 mol N center dot plant(-1)) combined with two water conditions, drought (D = 25 +/- 5% soil moisture content) and well-watered (W = 65 +/- 5% soil moisture content), was used. Overall, the gas exchange parameters, chlorophyll, and growth of T. sinensis seedlings were significantly inhibited under drought conditions, while all of them showed improvement with N fertilizer, particularly at 0.14 similar to 0.28 mol N center dot plant(-1). Under drought conditions, the root length and root surface area of T. sinensis increased; N application positively influenced the above root morphological changes. The activities of antioxidant enzymes such as superoxide dismutase (SOD; EC1.15.1.1) and peroxidase (POD; EC1.11.1.7) and the contents of osmotic adjustment substances such as soluble sugar and proline increased upon drought stress, but decreased under N application conditions. Overall, T. sinensis responds to drought stress through the synergistic action of drought resistance and drought tolerance mechanisms. N application enhances photosynthesis and improves root morphology, compensating for the need for osmotic regulation and reactive oxygen species scavenging.