H^+ tolerance of Chara Internodal Cells and Apparent Net Influx of H+ in Weakly Acidic Solutions: Implication of the Net Flux of H^+ as a Minor Component among the Total Net Flux of lons across the Intact Cell Membrane of Chara

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概要

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• Precise measurements of the net flux of protons in Chara internodal cells were made with a recently designed high-resolution pH-meter. Survival of intact Chara internodal cells in artificial pond water (APW) that contained HCl at various concentrations was also examined. The apparent net flux of H^+ was inward and much smaller than that reported so far. In APW at pH 4.005, a value higher than the extracellular pH expected from the values of H^+ efflux reported to date, all of the intact Chara internodal cells died within a day. With reference to the data on the circadian flow of ions in the pulvinus of Phaseolus [Kiyosawa (1979) Plant Cell Physiol. 20: 1621-1634, Hosokawa and Kiyosawa (1983) Plant Cell Physiol. 24: 1065-1072] and ionic regulation in Chara L-cells [Kiyosawa and Okihara (1988) Plant Cell/ Physiol. 29: 9-19], a discussion is presented of the prossibly minor contribution of the net flux of H^+ in the generation of the electrical membrane potential. Regulation of the net flux of H^+ in weakly acidic APW is also discussed.

• 日本植物生理学会の論文

著者

• Kiyosawa Keitaro

  Department Of Biophysical Engineering Faculty Of Engineering Science Osaka University

関連論文

• Ion Composition of the Chara Internode
• Examination of analytical methods for ions and saccharides in the extract of Phaseolus pulvini
• Osmotic and lonic Regulation in Chara L-cell Fragments
• Change in potassium distribution in a Phaseolus pulvinus during circadian movement of the leaf
• Unequal distribution of potassium and anions within the Phaseolus pulvinus during circadian leaf movement
• Diurnal Geotropic responses of the Primary Leaves of Phaseolus vulgaris
• Influence of External samotic Pressure on Water Permeability and Electrical Conductance of Chara Cell Membrane
• H^+ tolerance of Chara Internodal Cells and Apparent Net Influx of H+ in Weakly Acidic Solutions: Implication of the Net Flux of H^+ as a Minor Component among the Total Net Flux of lons across the Intact Cell Membrane of Chara
• Diurnal K^+ and Anion Transport in Phaseolus Pulvinus

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