期刊
JOURNAL OF PLANT PHYSIOLOGY
卷 262, 期 -, 页码 -出版社
ELSEVIER GMBH
DOI: 10.1016/j.jplph.2021.153432
关键词
Potassium; Potassium-transport systems; Ion channels; Macroevolution; Membrane bioenergetics; Plant nutrition
This paper focuses on the biological potassium acquisition and utilization processes in modern vascular plants over an evolutionary timescale, and delves into several prominent themes in plant K+ -transport physiology.
In this paper, we discuss biological potassium acquisition and utilization processes over an evolutionary timescale, with emphasis on modern vascular plants. The quintessential osmotic and electrical functions of the K+ ion are shown to be intimately tied to K+-transport systems and membrane energization. Several prominent themes in plant K+-transport physiology are explored in greater detail, including: (1) channel mediated K+ acquisition by roots at low external [K+]; (2) K+ loading of root xylem elements by active transport; (3) variations on the theme of K+ efflux from root cells to the extracellular environment; (4) the veracity and utility of the affinity concept in relation to transport systems. We close with a discussion of the importance of plant-potassium relations to our human world, and current trends in potassium nutrition from farm to table.
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