Please use this identifier to cite or link to this item: https://hdl.handle.net/2440/40112
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Type: Journal article
Title: Potassium homeostasis and membrane transport
Author: Leigh, R.
Citation: Journal of Plant Nutrition and Soil Science, 2001; 164(2):193-198
Publisher: Wiley-V C H Verlag GMBH
Issue Date: 2001
ISSN: 1436-8730
1522-2624
Statement of
Responsibility: 
Roger A. Leigh
Abstract: Cytosolic K+ activity in plant cells is about 80 mM and is maintained during moderate K⁺-deprivation. It decreases to much lower values only in extreme K⁺-deficiency. In contrast, the vacuolar K⁺ concentration responds directly to the K⁺ supply and can fall to very low values in severely K⁺-deprived cells. However, there is good evidence for an upper limit for vacuolar K⁺ concentration which is different in roots and leaves. Understanding of the molecular basis of active and passive K⁺ transport in plants has increased enormously in recent years but the role of individual transporters in uptake has still to be fully resolved, as has their regulation in relation to the maintenance of cytosolic and vacuolar K⁺ concentrations. In particular, the inverse relationship between the rate of K⁺ uptake and internal K⁺ concentration that was established over 25 years ago has still not been credibly explained at the molecular level.
Keywords: Cytosol
potassium
ion channels
plasma membrane
tonoplast
vacuole
Description: The definitive version may be found at www.wiley.com
DOI: 10.1002/1522-2624(200104)164:2<193::AID-JPLN193>3.0.CO;2-7
Appears in Collections:Agriculture, Food and Wine publications
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