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Journal of Experimental Botany, Vol 49, 13-19, Copyright © 1998 by Oxford University Press

ARTICLES

Control of phosphate transport across the plasma membrane of Chara corallina

T Mimura, R Reid and F Smith
Biological Laboratory, Hitotsubashi University, Naka 2-1, Kunitachi, Tokyo 186, Japan; Centre for Plant Membrane Biology and Department of Botany, University of Adelaide, Adelaide 5005, Australia; Corresponding author e-mail: rreid@botany.adelaide.edu.au

This paper examines the control of phosphate uptake into Chara corallina. Influxes of inorganic phosphate (Pi) into isolated single internodal cells were measured with 32Pi. Pretreatment of cells without Pi for up to 10 d increased Pi influx. However, during this starvation the concentrations of Pi in both the cytoplasm and the vacuole remained quite constant. When cells were pre-treated with 0.1 mM Pi, the subsequent influx of Pi was low. Under these conditions the Pi concentrations in the cytoplasm was almost the same as that of Pi-starved cells, but vacuolar Pi increased with time. Transfer of cells from medium containing 0.1 mM Pi to Pi-free medium induced an increase of Pi influx within 3 d irrespective of the concentration of Pi in the vacuole.During Pi starvation, neither the membrane potential nor the cytoplasmic pH changed. Manipulation of the cytoplasmic pH by weak acids or ammonium decreased the Pi influx slightly.Pi efflux was also measured, using cells loaded with 32Pi. Addition of a low concentration of Pi in the rinsing medium rapidly and temporarily induced an increase in the efflux.The results show that Pi influx is controlled by factors other than simple feedback from cytoplasmic or vacuolar Pi concentrations or thermodynamic driving forces for H+-coupled Pi uptake. It is suggested that uptake of Pi is controlled via the concentration of Pi in the external medium through induction or repression of two types of plasma membrane Pi transporters.Key words: Chara corallina, membrane transport, phosphate influx, phosphate starvation
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