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- W2170020873 abstract "Upon absorption of phosphate, cultured cells of Catharanthus roseus (L.) G. Don caused a rapid alkalinization of the medium in which they were suspended. The alkalinization continued until the added phosphate was completely exhausted from the medium, at which time the pH of the medium started to drop sharply toward the original pH value. Phosphate exposure caused the pH of the medium to increase from pH 3.5 to values as high as 5.8, while the rate of phosphate uptake was constant throughout (10-17 micromoles per hour per gram fresh weight). This indicates that no apparent pH optimum exists for the phosphate uptake by the cultured cells. The amount of protons cotransported with phosphate was calculated from the observed pH change up to the maximum alkalinization and the titration curve of the cell suspension. Proton/phosphate transport stoichiometry ranged from less than unity to 4 according to the amount of phosphate applied. At low phosphate doses, the stoichiometries were close to 4, while at high phosphate doses, smaller stoichiometries were observed. This suggests that, at high phosphate doses, activation of the proton pump is induced by the longer lasting proton influx acidifying the cytoplasm. The increased H(+) efflux due to the proton pump could partially compensate protons taken up via the proton-phosphate cotransport system. Thus, the H(+)/H(2)PO(4) (-) stoichiometry of the cotransport is most likely to be 4." @default.
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- W2170020873 date "1990-06-01" @default.
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- W2170020873 title "Proton/Phosphate Stoichiometry in Uptake of Inorganic Phosphate by Cultured Cells of <i>Catharanthus roseus</i> (L.) G. Don" @default.
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- W2170020873 doi "https://doi.org/10.1104/pp.93.2.479" @default.
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