The distribution of inorganic phosphate (Pi) between the cytoplasm and the vacuole of Humulus lupulus L. cells grown in suspension culture at different exogenous Pi levels was examined by 31-P nuclear magnetic resonance. In growing cells excess Pi accumulated in the vacuoles and the inhibitory effect of high exogenous Pi was not associated with a change in the cytoplasmic Pi level or with a change in the cytoplasmic pH.
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