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[1]WANG Yingnan,PENG Xiaoyuan,HUA Xiaoyu,et al.Effects of Nitrogen Deposition on the Ion Balance and Organic Acids of the Leymus chinensis-AM Symbiont Roots Under Saline-Alkali Stress[J].Research of Soil and Water Conservation,2019,26(02):118-125.

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Effects of Nitrogen Deposition on the Ion Balance and Organic Acids of the Leymus chinensis-AM Symbiont Roots Under Saline-Alkali Stress

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 26 Number of periods: 2019 02 Page number: 118-125 Column: Public date: 2019-04-28

Title:: Effects of Nitrogen Deposition on the Ion Balance and Organic Acids of the Leymus chinensis-AM Symbiont Roots Under Saline-Alkali Stress

Author(s):: WANG Yingnan¹, PENG Xiaoyuan¹, HUA Xiaoyu¹, YANG Chunxue², YAN Xiufeng¹, LIN Jixiang¹; 1. Alkali Soil Natural Environmental Science Center/Key Laboratory of Saline-Alkali Vegetation Ecology Restoration, Ministry of Education, Northeast Forestry University, Harbin 150040, China;
2. College of Landscape Architecture, Northeast Forestry University, Harbin 150040, China

Keywords:: Leymus chinensis; arbuscular mycorrhizal fungi; nitrogen deposition; salinity-alkalinity stress; organic acid

CLC:: S501

DOI:: -

Abstract:: In order to clarify the effects of the interaction of nitrogen deposition and salt-alkali stress on Leymus chinensis-arbuscular mycorrhizal symbiont osmotic adjustment and ion transport, the pot control experiments were conduced to analyze the changes of inorganic ion and organic acid content in Leymus chinensis roots. The results showed that with the improvement of salt-alkali stresses, the roots of Leymus chinensis seedling accumulated a lot of Na⁺, Ca²⁺ and Mg²⁺, and also inhibited the absorption of K⁺. Meanwhile, it has accumulated a large amount of Cl^- to maintain the osmotic and ionic balance in roots. Inoculation with AM fungi reduced the accumulation of Na+, and the decrease of K⁺ content was relieved under stresses, improving the content of NO₃^- to improve the ion balance of Leymus chinensis. Na⁺ content has increased under nitrogen deposition and resulted in the decreased resistance of Leymus chinensis-arbuscular mycorrhizal symbiosis to salt stress. Salt stress has little effect on organic acid content of Leymus chinensis seedling roots. Under alkaline stress, the content of organic acid increased. Inoculation of AM fungi decreased the content of organic acid in seeding roots. The inoculation with AM fungi could significantly improve the resistance of Leymus chinensis seedling roots. The increase of nitrogen deposition partially weakens the salinity tolerance of arbuscular mycorrhizal symbiosis, and the effect of ammonium nitrogen deposition is more significant. The results can provide certain theoretical basis for the response and feedback of the interaction of nitrogen deposition and salt-alkali stress to Leymus chinensis—AM symbiosis.

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