文献类型：期刊文献

英文题名：Depressed root morphology and altered hormone signaling in Toona sinensis brought about by different forms of excessive nitrogen

作者：Yu, Xiaochi[1,2] Yi, Fei[1,3] Wang, Xiaoxi[4] Liu, Bingyang[1] Fei, Yue[1] Zhang, Peng[2] Wang, Junhui[1] Ma, Wenjun[1]

第一作者：Yu, Xiaochi

通信作者：Ma, WJ[1]

机构：[1]Chinese Acad Forestry, Res Inst Forestry, State Key Lab Tree Genet & Breeding, Key Lab Tree Breeding & Cultivat Natl Forestry & G, Beijing 100091, Peoples R China;[2]Northeast Forestry Univ, Forestry Coll, Harbin 150040, Peoples R China;[3]Three Gorges Univ, Coll Biol & Pharmaceut Sci, Yichang 443002, Peoples R China;[4]Nanyang Forestry Sci Res Inst, Nanyang 473000, Peoples R China

年份：2024

外文期刊名：TREES-STRUCTURE AND FUNCTION

收录：;EI(收录号：20243917105002);Scopus(收录号：2-s2.0-85204673504);WOS:【SCI-EXPANDED(收录号:WOS:001320070200001)】；

基金：This study was funded by Open Fund of State Key Laboratory of Tree Genetics and Breeding (Chinese Academy of Forestry) (Grant No. K2020201), and National Key R&D Program 2021YFD2200305.

语种：英文

外文关键词：Excessive nitrogen; Toona sinensis; Nitrogen forms; GS/GOGAT; Phytohormone

摘要：Toona sinensis, a precious tree species native to China, faces severe excessive nitrogen (N) stress due to escalating nitrogen deposition. The effects of excessive N (NO3-, NH4+ and NO3- + NH4+) on root morphology and physiology were investigated in 1-year-old T. sinensis seedlings. Under excessive NH4+, root morphology traits like root surface area and volume were inhibited, and under excessive NO3-, root length, surface area, and volume were more significantly suppressed. However, a minimal decrease in branch number, apical number, specific root area, and specific root length was observed under excessive NO3- + NH4+. Under excessive NO3- or NH4+, the activity of N-metabolizing enzymes such as glutamine synthetase (GS), glutamate synthetase (GOGAT), nitrate reductase (NR), and nitrite reductase (NiR) in roots decreased. Under excessive N, the indole acetic acid (IAA) content in roots decreased, while the contents of abscisic acid (ABA) and cytokinins (CTK) increased. Overall, excessive NO3- or NH4+ induced nutrient overload, which inhibited root development in T. sinensis. On the other hand, hormone signaling was also modulated in response to excess N, and root morphology changed. These findings enhance our understanding of the effects of excessive N stress on T. sinensis and provide guidance for its plantation production.