文献类型：期刊文献

英文题名：Photosynthetic Carbon Reallocation to Nitrogen Metabolism Confers Adaptation Advantage of Leymus secalinus Under Elevated Nitrogen Deposition in Alpine Grassland

作者：Zuo, Hui[1] Shen, Hao[1,2,3] Dong, Shikui[1] Guo, Qianqian[1] Yamori, Wataru[3] Liu, Junxiang[4] Zheng, Hanzhong[5] He, Fengcai[1] Zhang, Yuhao[1] Zhang, Ran[1] Shi, Hang[1] Zhang, Ke[1] Ma, Chunhui[1] Li, Xueqi[1] Zhou, Xianqi[1] Ran, Mingjie[1] Du, Annan[1] Wang, Yuhan[1]

第一作者：Zuo, Hui

通信作者：Shen, H[1];Dong, SK[1];Shen, H[2];Shen, H[3]

机构：[1]Beijing Forestry Univ, Sch Grassland Sci, Beijing, Peoples R China;[2]Japan Soc Promot Sci, Tokyo, Japan;[3]Univ Tokyo, Inst Sustainable Agriecosyst Serv, Grad Sch Agr & Life Sci, Tokyo, Japan;[4]Chinese Acad Forestry, State Key Lab Tree Genet & Breeding, Key Lab Tree Breeding & Cultivat, State Forestry Adm,Res Inst Forestry, Beijing, Peoples R China;[5]Radboud Univ Nijmegen, Dept Environm Sci, Nijmegen, Netherlands

年份：2026

外文期刊名：PLANT CELL AND ENVIRONMENT

收录：;Scopus(收录号：2-s2.0-105027222713);WOS:【SCI-EXPANDED(收录号:WOS:001655850700001)】；

基金：National Natural Science Foundation of China, Grant/Award Numbers: 32361143870, 32401291; National Key Research and Development Program of China, Grant/Award Number: 2023YFF1304303

语种：英文

外文关键词：alpine grassland; carbon and nitrogen metabolism; Leymus secalinus; nitrogen deposition; stress resistance

摘要：Nitrogen (N) deposition has driven a tendency towards graminoid monodominance in alpine grassland plant communities on the Qinghai-Tibetan Plateau (QTP), but the molecular mechanisms underlying these changes remain poorly understood. Here, we selected Leymus secalinus, the most dominant species in alpine grasslands of the QTP under N addition, to characterise its adaptation to N addition by measuring integrated morphological, physiological traits, transcriptomics, proteomics and metabolomics at different simulated levels of N addition of 0 (CK), 8 (N1), 40 (N3) and 72 (N5) kg N ha- 1 yr- 1. The results demonstrated that N addition significantly promoted the dominant growth of L. secalinus, enhancing its biomass and importance value. Under N addition, the expression of genes and proteins encoding key components of the photosystem (such as photosystem I and II proteins, antennae proteins, cytochrome b6f complex proteins, ferredoxin proteins) in L. secalinus was significantly up-regulated, enhancing its ability to compete for light resources. However, the enhancement of photosynthesis did not lead to the accumulation of soluble sugars and starch in L. secalinus. Instead, more carbon (C) skeletons and photosynthesis products were allocated to synthesise amino acids and their derivatives through the accelerated cyclic process of C and N metabolism to support the rapid growth of L. secalinus. Additionally, N addition obviously increased the antioxidant defence capacity of L. secalinus under the QTP's harsh environmental. These pathways might collectively contribute to the dominance of L. secalinus in alpine grassland on the QTP under N deposition, providing new insights into the response of alpine grassland plants to N deposition.