Sodium Influx and Potassium Efflux Currents in Sunflower Root Cells Under High Salinity

Activation of sodium-activated potassium channels by sodium-influx

of the dissertation ii

Light-dependent Influx and Efflux of Potassium of Guard Cells during Stomatal Opening and Closing.

Stomata in epidermal strips of Vicia faba opened in light and closed in darkness when floated on dilute K(+) solutions. Opening and closing, respectively, paralleled the fluxes of labeled K(+) into and out of the strips. The gain and loss of K(+) by the strips were shown by colbaltinitrite stain to be centered at guard cells. Intact epidermal cells, however, appeared to take up K(+), complicati...

Sodium - calcium interactions under salinity stress 205 CHAPTER 10 SODIUM - CALCIUM INTERACTIONS UNDER SALINITY STRESS

There are a wide range of responses of plants to salinity which involve interactions of Na with Ca. Plant processes such as growth, photosynthesis, mineral nutrition, water and ion transport are affected by these Na-Ca interactions. Many of these responses can be linked to the direct Na-Ca interactions at the surface of the plasma membrane and subsequent Ca signaling events. 10.1. General Effec...

Active Sodium and Potassium Transport in High Potassium and Low Potassium Sheep Red Cells

The kinetic characteristics of the ouabain-sensitive (Na + K) transport system (pump) of high potassium (HK) and low potassium (LK) sheep red cells have been investigated. In sodium medium, the curve relating pump rate to external K is sigmoid with half maximal stimulation (K(1/2)) occurring at 3 mM for both cell types, the maximum pump rate in HK cells being about four times that in LK cells. ...

Tamoxifen inhibits sodium and potassium currents in rat ventricular myocytes