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Relationship between Energy-Dependent Phosphate Uptake and the Electrical Membrane Potential in Lemna gibba G1

Novacky, Anton ; Lüttge, Ulrich

Plant Physiology, 1 April 1981, Vol.67(4), pp.797-801 [Periódico revisado por pares]

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  • Título:
    Relationship between Energy-Dependent Phosphate Uptake and the Electrical Membrane Potential in Lemna gibba G1
  • Autor: Novacky, Anton ; Lüttge, Ulrich
  • Assuntos: Botany
  • É parte de: Plant Physiology, 1 April 1981, Vol.67(4), pp.797-801
  • Descrição: High rates of phosphate uptake into phosphate-starved Lemna gibba L. G1 were correlated with a high membrane potential (pd = -220 millivolts). In plants maintaining a low pd (-110 millivolts), the uptake rate was only 20% of that of high-pd plants. At the onset of phosphate transport, the membrane of high-pd plants was transiently depolarized. This effect was much smaller in low-pd plants. Light stimulated phosphate uptake and the repolarization upon phosphate-induced depolarization, especially in plants grown without sucrose. The phosphate uptake rate was optimal at pH 6 and decreased with increasing pH, corresponding to the phosphate-induced pd changes. Phosphate starvation stimulated the uptake and increased the phosphate-induced depolarization, thus indicating that phosphate uptake depends on the intracellular phosphate level. It is suggested that uptake of monovalent phosphate in Lemna gibba proceeds by an H + cotransport dependent on the proton electrochemical potential difference and, hence, on the activity of an H + -extrusion pump.
  • Idioma: Inglês

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