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|Title:||Potassium homeostasis and membrane transport|
|Citation:||Journal of Plant Nutrition and Soil Science, 2001; 164(2):193-198|
|Publisher:||Wiley-V C H Verlag GMBH|
|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.|
|Description:||The definitive version may be found at www.wiley.com|
|Appears in Collections:||Agriculture, Food and Wine publications|
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