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Research ArticleEnvironmental and Stress Physiology
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Salt Stress-Induced Cytoplasmic Acidification and Vacuolar Alkalization in Nitellopsis obtusa Cells

In Vivo31P-Nuclear Magnetic Resonance Study

Maki Katsuhara, Kazuyuki Kuchitsu, Kazuhiko Takeshige, Masashi Tazawa
Maki Katsuhara
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Kazuyuki Kuchitsu
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Kazuhiko Takeshige
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Masashi Tazawa
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Published July 1989. DOI: https://doi.org/10.1104/pp.90.3.1102

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Abstract

Time courses of cytoplasmic and vacuolar pH changes under salt stress were monitored by in vivo31P-nuclear magnetic resonance spectroscopy in intact cells of Nitellopsis obtusa. When cells were treated with 100 millimolar NaCl for 2 hours, the cytoplasmic pH deceased from 7.2 to 7.0, while the vacuolar pH increased from 4.9 to 5.2. This salt-induced breakdown of the pH gradient between the cytoplasm and the vacuole was also confirmed through direct measurements of change in vacuolar pH with a micro-pH electrode. We speculate that the intracellular pH changes induced by the salt stress mainly results from the inhibition of the H+-translocating pyrophosphatase in the vacuolar membrane, since this H+-translocating system is sensitive to salt-induced increase in the cytoplasmic [Na+] and a simultaneous decrease in the cytoplasmic [K+]. Since disturbance of the cytoplasmic pH value should have serious consequences on the homeostasis of living cells, we propose that the salt-induced intracellular pH changes are one of initial and important steps that lead to cell death.

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Salt Stress-Induced Cytoplasmic Acidification and Vacuolar Alkalization in Nitellopsis obtusa Cells
Maki Katsuhara, Kazuyuki Kuchitsu, Kazuhiko Takeshige, Masashi Tazawa
Plant Physiology Jul 1989, 90 (3) 1102-1107; DOI: 10.1104/pp.90.3.1102

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Salt Stress-Induced Cytoplasmic Acidification and Vacuolar Alkalization in Nitellopsis obtusa Cells
Maki Katsuhara, Kazuyuki Kuchitsu, Kazuhiko Takeshige, Masashi Tazawa
Plant Physiology Jul 1989, 90 (3) 1102-1107; DOI: 10.1104/pp.90.3.1102
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Plant Physiology
Vol. 90, Issue 3
July 1989
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  • Inactivation of Photosystems I and II in Response to Osmotic Stress in Synechococcus. Contribution of Water Channels
Show more Environmental and Stress Physiology

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