ISSN:
1432-2048
Keywords:
Electrochemical potentials
;
Hordeum
;
Ion influx (root)
;
Potassium influx
;
Potential (electrochemical)
;
Root (ion influx)
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Abstract The electrochemical potential differences $$\left( {\Delta \overline \mu _{{\rm K}^ + } } \right)$$ for potassium, between excised barley (Hordeum vulgare L.) roots and external media containing 0.05 mM KCl+0.5 mM CaSO4, were determined over a 4-h period during which initially low-K+ roots accumulated K+ by pretreatment in 50 mM KCl plus 0.5 mM CaCl2. This pretreatment resulted in increased internal [K+], decreased K+ influx (as measured from 0.05 mM KCl+0.5 mM CaSO4) and decreased values of $$\Delta \overline \mu _{{\rm K}^ + }$$ . These observations indicate that the decline of K+ influx associated with increased internal K+ concentration cannot be accounted for by passive adjustment to the electrochemical gradient for this ion.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00388368
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