PLANT PHYSIOLOGY · 1975 · 60 citations · 15 references
AgriculturePlant BiologyPlant SciencesPlant BiochemistryPlant EcophysiologyPlant PhysiologyNutrient UptakeNutrient Uptake By PlantsPlant Nutrient UptakePotassium HomeostasisRoot PhysiologySalt Stress PhysiologyInflux ControlInflux ModelingPlant Potassium StatusPotassium AccumulationPotassium TranslocationPotassium Uptake KineticsRoot Potassium TransportRoot Potassium Uptake
The dynamics of changes in K(+) influx across the plasmalemma and of internal K(+) concentrations [K(+)](1) of intact barley (Hordeum vulgare) roots were examined as the roots were converted from ;high-salt' to ;low-salt' roots. Following the transfer of plants grown in 0.5 mm CaSO(4) solutions plus various concentrations of KCl to 0.5 mm CaSO(4) solutions, influx rates increased and internal K(+) concentrations declined as a function of time and the initial K(+) status of the tissue. The relationship between plasmalemma influx and [K(+)](1) was examined over a wide range of [K(+)](1) values by growing intact plants in various concentrations of KCl. Plasmalemma influx was inversely correlated with the square of [K(+)](1). A model for the regulation of plasmalemma influx by [K(+)](1) is considered.
15