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Acta Prataculturae Sinica ›› 2023, Vol. 32 ›› Issue (2): 178-190.DOI: 10.11686/cyxb2022078

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Research progress relating to stelar K+ outward rectifier (SKOR) channels in plants

Pan-pan REN(), Guo-qiang WU(), Ming WEI   

  1. School of Life Science and Engineering,Lanzhou University of Technology,Lanzhou 730050,China
  • Received:2022-02-18 Revised:2022-03-28 Online:2023-02-20 Published:2022-12-01
  • Contact: Guo-qiang WU

Abstract:

Maintaining K+ homeostasis is one of important physiological component processes in plant resistance to abiotic stress. Stelar K+ outward rectifier (SKOR) is one of the outward rectifier K+ channels located in the plasma membrane of pericycle cells in plant roots. This channel is involved in mediating K+ efflux from cytoplasm and K+ loading in xylem. On the one hand, SKOR regulates intracellular K+ homeostasis; while on the other hand, it maintains the K+ balance between root and shoot by controlling K+ flow in xylem. SKOR plays a crucial role in plant response to salt, drought and nutrient deficiency. Therefore, research into SKOR function and regulation and its application is of great significance for crop production and stress resistance enhancement. In this study, the discovery, structure, nomenclature, biological function, gene expression regulation, and response to abiotic stresses of the SKOR family are reviewed, and directions for future research into functioning of this channel are proposed. This review contributes theoretical understanding and knowledge of gene resources for the genetic improvement of crop quality and stress resistance.

Key words: outward rectifier K+ channel, K+ starvation, K+ loading in xylem, regulation, stress response