Vacuolar and cytoplasmic pH,ion composition,and turgor pressure in Lamprothamnium as a function of external pH |
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Authors: | G O Kirst M A Bisson |
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Institution: | (1) Institut für Botanik der Technischen Hochschule, Schnittspahnstrasse 3-5, D-6100 Darmstadt, Federal Republic of Germany;(2) School of Biological Sciences, University of Sydney, 2006, N.S.W., Australia;(3) Present address: Department of Biological Sciences, State University of New York, 14260 Buffalo, NY, USA |
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Abstract: | Ionic responses to alteration in external and internal pH were examined in an organism from a marine-like environment. Vacuolar pH (pHv) is about 4.9–5.1, constant at external pH (pHo) 5–8, while cytoplasmic pH (pHc) increases from 7.3 to 7.7. pHc regulation fails above pHo 9, and this is accompanied by failure of turgor regulation. Na+ increases above pHo 9, while K+ and Cl– decrease. These changes alone cannot however explain the alterations in turgor. Agents known to affect internal pH are also tested for their effect on ion relations.Abbreviations Ci
ion concentration
- CCCP
carbonyl cyanide m-chlorophenyl hydrazone
- DCCD
dicyclohexylcarbodiimide
- DES
diethylstilbestrol
- DMO
5,5-dimethyloxazolidine-2,4-dione
- DNP
2,4-dinitrophenol
- pHo
external pH
- pHc
cytoplasmic pH
- pHv
vacuolar pH
- i
osmotic pressure
-
turgor pressure |
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Keywords: | Charophyta Ion composition Lamprothamnium pH (internal) Salinity Turgor pressure |
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