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Journal of Desert Research ›› 2023, Vol. 43 ›› Issue (2): 205-215.DOI: 10.7522/j.issn.1000-694X.2023.00006

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Physiological responses and differences of Populus euphratica to salt stress and drought stress

Duan Li1(), Jianhua Si2(), Jiyan Li1, Peijiang Wang1, Liming Yuan1   

  1. 1.Institute of Geographical Science,Taiyuan Normal University,Jinzhong 030619,Shanxi,China
    2.Key Laboratory of Eco-hydrology of Inland River Basin,Northwest Institute of Eco-Environment Resources,Chinese Academy of Sciences,Lanzhou 730000,China
  • Received:2022-12-10 Revised:2023-01-16 Online:2023-03-20 Published:2023-04-12
  • Contact: Jianhua Si

Abstract:

Using two-year-old Populus euphratica seedlings as test materials, the study of P. euphratica under different salt stress (0, 100, 200, 300, 400 mmol·L-1 of NaCl) and different drought stress (0, 7, 14, 21, 28 day) was conducted. The results showed that:In terms of the antioxidant enzyme system, with the increase of salt stress and drought stress, the activities of protective enzymes SOD, POD and CAT increased first and then decreased. The reaction speed and duration of different protective enzymes were different in response to drought stress and salt stress. The protective enzymes of P. euphratica were comprehensively regulated to form the defense function of the whole antioxidant enzyme system. As for the osmotic regulation system, with the increase of salt stress and drought stress, the content of soluble sugar continued to increase, and the response speed and duration of its accumulation to different levels of salt stress and drought stress were different. The osmotic balance was maintained by the continuous accumulation of organic matter to form the long-term protection function of the osmotic regulation system. In the cell membrane system, with the increase of salt stress, MDA content first decreased and then slowly increased, basically maintaining a low level, while with the increase of drought stress, MDA content continued to increase. Under salt stress and mild drought stress, P. euphratica can maintain the integrity of cell membrane structure and function through adaptive regulation to realize the protective effect of the cell membrane system. Under salt stress and drought stress, the antioxidant enzyme system, osmotic regulation system, and cell membrane system were adapted to enhance the salt tolerance and drought resistance of P. euphratica. The study on physiological response of P. euphratica to salt stress and drought stress is of great significance for the cultivation and recovery of the seedlings in the lower reaches of the Heihe River.

Key words: Populus euphratica, salt stress, drought stress, physiological responses

CLC Number: