Abstract
AbstractThe specific effects of pH on the accumulation mechanism of Rb+ by excised barley roots were investigated.Exposure of roots to solutions of a wide range of pH values did not result in any noticeable damage. It is therefore suggested that even pH 3.5 is within the physiological range of pH for barley roots.It is assumed that the inhibitory effect of pH on Rb+ accumulation is due to competition of H ions on binding sites of the temperature dependent metabolic accumulation mechanism. When this mechanism is saturated with Rb ions, no inhibition of H ions occurs, even at pH 3.5.Temperature coefficients provide hints that the inhibitory effects of Na and H ions on Rb+ accumulation are similar.
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