The expression of constitutively active CPK3 impairs potassium uptake and transport in Arabidopsis under low K+ stress

Cell Calcium ◽  
2021 ◽  
pp. 102447
Author(s):  
Ren Huimin ◽  
Jamshaid Hussain ◽  
Li Wenjie ◽  
Yao Fenyong ◽  
Guo Junjun ◽  
...  
Keyword(s):  
Potassium Uptake ◽  
Low K ◽  
Uptake And Transport ◽  
Constitutively Active

Potassium Uptake and Transport in Roots ofRicinus communis

1964 ◽  
Vol 15 (3) ◽  
pp. 413-421 ◽  
Author(s):  
D. J. F. BOWLING ◽  
P. E. WEATHERLEY
Keyword(s):  
Potassium Uptake ◽  
Uptake And Transport

scholarly journals Net Uptake of Potassium in Neurospora Exchange for sodium and hydrogen ions

1968 ◽  
Vol 52 (3) ◽  
pp. 424-443 ◽  
Author(s):  
Clifford L. Slayman ◽  
Carolyn W. Slayman
Keyword(s):  
Transport System ◽  
Potassium Uptake ◽  
Hydrogen Ions ◽  
Cell Water ◽  
K Uptake ◽  
Respiratory Inhibition ◽  
Net Uptake ◽  
Order Of Magnitude ◽  
External Site ◽  
Low K

Net uptake of potassium by low K, high Na cells of Neurospora at pH 5.8 is accompanied by net extrusion of sodium and hydrogen ions. The amount of potassium taken up by the cells is matched by the sum of sodium and hydrogen ions lost, under a variety of conditions: prolonged preincubation, partial respiratory inhibition (DNP), and lowered [K]o. All three fluxes are exponential with time and obey Michaelis kinetics as functions of [K]o. The Vmax for net potassium uptake, 22.7 mmoles/kg cell water/min, is very close to that for K/K exchange reported previously (20 mmoles/kg cell water/min). However, the apparent Km for net potassium uptake, 11.8 mM [K]o, is an order of magnitude larger than the value (1 mM) for K/K exchange. It is suggested that a single transport system handles both net K uptake and K/K exchange, but that the affinity of the external site for potassium is influenced by the species of ion being extruded.

scholarly journals Potassium Uptake Systems in Staphylococcus aureus: New Stories about Ancient Systems

mBio ◽  
2013 ◽  
Vol 4 (5) ◽  
Author(s):  
Angelika Gründling
Keyword(s):  
Staphylococcus Aureus ◽  
Potassium Uptake ◽  
High Salt ◽  
Transport Systems ◽  
Content Type ◽  
Human Host ◽  
Uptake And Transport ◽  
Better Than

ABSTRACTStaphylococcus aureusis a hardy organism that can survive high-salt conditions better than many other bacteria. This characteristic is thought to helpS. aureussurvive in the nares and on the skin of the human host and is used to selectively propagate and identifyStaphylococcusspecies. However, the mechanism that allowsS. aureusto tolerate such high-salt conditions is not well understood. A recent study inmBioby A. Price-Whelan et al. [mBio 4(4):e00407-13, 2013, doi:10.1128/mBio.00407-13] highlights the importance of potassium uptake in this process. This commentary provides a perspective of the study by Price-Whelan et al. as well as other recently reported work on potassium uptake and transport systems inS. aureus.

scholarly journals Potassium Uptake and Transport in Apple Roots Under Drought Stress

2019 ◽  
Vol 5 (1) ◽  
pp. 10-16 ◽  
Author(s):  
Jianguo Qi ◽  
Simin Sun ◽  
Lin Yang ◽  
Mingjun Li ◽  
Fengwang Ma ◽  
...  
Keyword(s):  
Drought Stress ◽  
Potassium Uptake ◽  
Uptake And Transport

Use of SEM, X-ray analysis and TEM to localize Fe3+ reduction in roots

1988 ◽  
Vol 46 ◽  
pp. 392-393 ◽  
Author(s):  
William P. Wergin ◽  
P. F. Bell ◽  
Rufus L. Chaney
Keyword(s):  
Electron Microscopy ◽  
Root Hairs ◽  
Rapid Reduction ◽  
X Ray ◽  
Physical Evidence ◽  
Transmission Electron ◽  
Young Root ◽  
Insoluble Precipitate ◽  
Uptake And Transport ◽  
Scanning Electron

In dicotyledons, Fe3+ must be reduced to Fe2+ before uptake and transport of this essential macronutrient can occur. Ambler et al demonstrated that reduction along the root could be observed by the formation of a stain, Prussian blue (PB), Fe4 [Fe(CN)6]3 n H2O (where n = 14-16). This stain, which is an insoluble precipitate, forms at the reduction site when the nutrient solution contains Fe3+ and ferricyanide. In 1972, Chaney et al proposed a model which suggested that the Fe3+ reduction site occurred outside the cell membrane; however, no physical evidence to support the model was presented at that time. A more recent study using the PB stain indicates that rapid reduction of Fe3+ occurs in a region of the root containing young root hairs. Furthermore the most pronounced activity occurs in plants that are deficient in Fe. To more precisely localize the site of Fe3+ reduction, scanning electron microscopy (SEM), x-ray analysis, and transmission electron microscopy (TEM) were utilized to examine the distribution of the PB precipitate that was induced to form in roots.

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