Biotechnology Bulletin ›› 2023, Vol. 39 ›› Issue (1): 59-72.doi: 10.13560/j.cnki.biotech.bull.1985.2022-0342

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Research Progress in Na+ Antiport and Physiological Growth Mechanisms of Differernt Halophytes Adapted to Salt Stress

LIU Jia-xin1,2,3(), ZHANG Hui-long1,2,3, ZOU Rong-song1,2,3, YANG Xiu-yan1,2,3, ZHU Jian-feng1,2,3(), ZHANG Hua-xin1,2,3()   

  1. 1. Research Center of Saline and Alkali Land of State Forestry and Grassland Administration, Institute of Ecological Protection and Restoration, Chinese Academy of Forestry, Beijing 100091
    2. Tianjin Institute of Forestry Science, Chinese Academy of Forestry, Tianjin 300457
    3. Comprehensive Experimental Center of Chinese Academy of Forestry in Yellow River Delta, Dongying 257500
  • Received:2022-03-22 Online:2023-01-26 Published:2023-02-02
  • Contact: ZHU Jian-feng,ZHANG Hua-xin E-mail:liujiaxin19980707@163.com;jfzhu@caf.ac.cn;zhanghx1998@126.com

Abstract:

Halophytes refer to plants that can grow and complete their life cycle in habitats with an ion concentration of at least 200 mmol/L. Halophytes can be classified into three types:euhalophytes, recretohalophytes and pseudohalophytes. This review summarizes the different strategies and research progress of the three types of halophytes in response to salt stress from the three aspects of growth morphology, physiology and molecule. It is found that halophytes mainly use Na+ transporters genes and energy-providing genes to respond to excessive Na+ at the molecular level, which may be an important factor that causes halophytes to be different from non-halophytes in physiology and growth morphology. Euhalophytes respond to salt stress mainly through vacuolar ion compartmentalization and have succulent growth morphology. Recretohalophytes respond to salt through by expelling salt from their bodies and evolve unique physiological structures-salt glands or salt vesicles. Pseudohalophytes reduce the upward transport of Na+ by accumulating salt ions in the vacuoles of cortical cells and parenchyma cells of root xylem; meanwhile, root is having suberization to reduce the absorption of Na+. The purpose of the review is to provide relevant basis for the study of halophytes and their salt tolerance mechanism and lay a foundation for plant salt tolerance molecular breeding in the future.

Key words: halophytes, Na+ antiport, physiological mechanism of salt tolerance, growth mechanism of salt tolerance