Metabolic Effects on Ion Fluxes in Nitella Translucens II. Tonoplast Fluxes
نویسندگان
چکیده
منابع مشابه
Localization of Hydrogen Ion and Chloride Ion Fluxes in Nitella
Alternating bands of acid and base formation have been detected along the length of the internodal cell of Nitella clavata when it is illuminated, while in the dark this phenomenon is minimal. Chloride influx occurs only or largely in the acid-extruding regions, and this is also a light-dependent ion movement. Chloride efflux is slightly dependent on illumination and is not localized as are H(+...
متن کاملFactors Affecting the Fluxes of Potassium and Chloride Ions in Nitella translucens
A more complete study of ionic concentrations and fluxes in the giant internodal cells of Nitella translucens has been made. The vacuolar concentrations were 76 mM K and 170 mM Cl. The content of the chloroplast layer was 135 mmicromoles K/cm(2) and 215 mmicromoles Cl/cm(2); in a layer 9 micro thick these correspond to concentrations of 150 mM K and 240 mM Cl. Such a high level of chloride requ...
متن کاملNa and K Fluxes in Nitella clavata
Na and K influxes and effluxes, membrane potentials, and cell ion concentrations of Nitella clavata were measured as functions of external NaCl concentrations and time. It appears necessary to conclude that active K transport into the cells as well as active Na extrusion is present, although the latter is of small magnitude and possibly is explicable as exchange-diffusion. An attempt has been m...
متن کاملThe Influence of H+ on the Membrane Potential and Ion Fluxes of Nitella
The resting membrane potential of the Nitella cell is relatively insensitive to [K](o), but behaves like a hydrogen electrode. K(+) and Cl(-) effluxes from the cell were measured continuously, while the membrane potential was changed either by means of a negative feedback circuit or by external pH changes. The experiments indicate that P(K) and P(Cl) are independent of pH but are a function of ...
متن کاملIonic Relations of Nitella translucens
The ionic state of single internodal cells of a fresh water characean, Nitella translucens, has been studied. In mature cells the vacuolar concentrations were 78 mM K, 60 mM Na, and 151 mM Cl, compared with concentrations of 0.1 mM K, 1.0 mM Na, and 1.3 mM Cl in the bathing medium. The results suggest an active influx of potassium and an active efflux of sodium at the plasmalemma, and an active...
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ژورنال
عنوان ژورنال: Australian Journal of Biological Sciences
سال: 1966
ISSN: 0004-9417
DOI: 10.1071/bi9660371