Energization of potassium uptake in Arabidopsis thaliana

  title={Energization of potassium uptake in Arabidopsis thaliana},
  author={Frans J M Maathuis and Dale Sanders},
Plant roots accumulate K+ from micromolar external concentrations. However, the absence of a firm determination of the trans-plasma-membrane electrochemical gradient for K+ in these conditions has precluded an assessment of whether K+-accumulation requires energization in addition to the driving force provided by the inside-negative membrane electrical potential (Em). To address this question unequivocally, we measured Em, and the cytosolic and external K+-activities in root cells of… CONTINUE READING