Light-dependent potassium uptake by Pisum sativum leaf fragments

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概要

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• A net K^+ influx into chopped pea leaves bathed in 5mM KCl, 0.26 M sucrose and illuminated with 4000 lux amounted to about 7.5 μmoles/g fresh weight-hr, while essentially no net flux occurred in the dark. This light-dependent K^+ uptake was linear with time for nearly 2 hr and continuously increased as the light intensity was raised to 9000 lux. Over half of the K^+ uptake was balanced by H^+ release into the bathing solution, possibly by a mechanism in which bicarbonate was the anion accompanying K^+. The replacement of Cl^- by HCO_3^- increased the light-dependent K^+ uptake to 56 μmoles/g fresh weight-hr. About 23% of the light-dependent K^+ uptake in 5mM KCl was accompanied by a Cl^- uptake. This net Cl^- influx was less sensitive to the uncoupler tri-Fl-CCP and more sensitive to DCMU in the bathing solution than was the K^+ uptake. The remaining net K^+ influx into pea leaf fragments was balanced by effluxes of sodium (accounting for 5%), magnesium (8%) and calcium (1%).

• 日本植物生理学会の論文

著者

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  Department Of Biophysics And Biochemistry Faculty Of Science University Of Tokyo:department Of Biolo

• Nobel Park

  Department Of Botanical Sciences And Molecular Biology Institute University Of California Los Angele

関連論文

• LOCALIZATION OF LIGHT-INDUCED STRONTIUM ACCUMULATION IN SPINACH CHLOROPLASTS
• Increased CO_2 fixation by Pisum sativum chloroplasts in vitro reflecting a change in coupling caused by illuminating the plants
• Energetic basis of the light-induced chloroplast shrinkage iu vivo
• Relative anion permeabilities and concentrations in leaf cells of Pisum sativum determined using electrical measurements and the Goldman equation
• Light-dependent potassium uptake by Pisum sativum leaf fragments

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