2026-04-17T03:13:37Zhttps://recercat.cat/oai/request

oai:recercat.cat:10459.1/728182024-12-05T22:35:17Zcom_2072_3622col_2072_479130

00925njm 22002777a 4500 dc Gao, Yongfeng author Sun, Yufang author Ou, Yongbin author Zheng, Xinhua author Feng, Qian author Zhang, Hao author Fei, Yang author Luo, Jie author Resco de Dios, Víctor author Yao, Yinan author 2022-01-25T11:05:58Z 2022-01-25T11:05:58Z 2021 Soil salinity is a widespread stress in semi-arid forests worldwide, but how to manage nitrogen (N) nutrition to improve plant saline tolerance remains unclear. Here, the cuttings of a widely distributed poplar from central Asia, Populus russikki Jabl., were exposed to either normal or low nitrogen (LN) concentrations for two weeks in semi-controlled greenhouse, and then they were added with moderate salt solution or not for another two weeks to evaluate their physiological, biochemical, metabolites and transcriptomic profile changes. LN-pretreating alleviated the toxicity caused by the subsequent salt stress in the poplar plants, demonstrated by a significant reduction in the influx of Na+ and Cl- and improvement of the K+/Na+ ratio. The other salt-stressed traits were also ameliarated, indicated by the variations of chlorophyll content, PSII photochemical activity and lipid peroxidation. Stress alleviation resulted from two different processes. First, LN pretreatment caused a significant increase of non-structural carbohydrates (NSC), allowed for an increased production of osmolytes and a higher potential fueling ion transport under subsequent salt condition, along with increased transcript levels of the cation/H+ ATPase. Second, LN pretreatment enhanced the transcript levels of stress signaling components and phytohormones pathway as well as antioxidant enzyme activities. The results indicate that early restrictions of N supply could enhance posterior survival under saline stress in poplar plants, which is important for plantation programs and restoration activities in semi-arid areas. This research was supported by Natural Science Foundation of China ( 31770644 and 31270660 ), Project of Innovation research team in Sichuan Education Administration in China (No. 13TD0023 ). http://hdl.handle.net/10459.1/72818 Populus russikki Salt stress Transcriptome profile change Carbon/nitrogen ratio Carboni Nitrogen Arbres Biocompatibilitat Arbres--Creixement Arbres--Protecció Pretreating poplar cuttings with low nitrogen ameliorates salt stress responses by increasing stored carbohydrates and priming stress signaling pathways