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pubmed-article:16661757pubmed:abstractTextHigh 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.lld:pubmed
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pubmed-article:16661757pubmed:dateRevised2010-9-15lld:pubmed
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pubmed-article:16661757pubmed:articleTitleRelationship between Energy-dependent Phosphate Uptake and the Electrical Membrane Potential in Lemna gibba G1.lld:pubmed
pubmed-article:16661757pubmed:affiliationInstitut für Botanik der Technischen Hochschule Darmstadt, Schnittspahnstrasse 3 - 5, D-6100 Darmstadt, Federal Republic of Germany.lld:pubmed
pubmed-article:16661757pubmed:publicationTypeJournal Articlelld:pubmed
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