The permeability of the epidermal cell plasma membrane of barley leaves to abscisic acid

  title={The permeability of the epidermal cell plasma membrane of barley leaves to abscisic acid},
  author={Wolfgang Daeter and Wolfram Hartung},
Uptake of 3H-labelled (±)-abscisic acid (ABA) into isolated barley (Hordeum vulgare L.) epidermal cell protoplasts (ECP) was followed over a range of pH values and ABA concentrations. The present results show that ABA uptake is not always linearly correlated with the external concentration of undissociated ABA (ABAH). At pH 7.25, ABA uptake exhibited saturation kinetics with an apparent K m value of 75 mmol·m−3 to tal ABA. This saturable transport component was inhibited by pretreating the… CONTINUE READING
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