Plant Physiol.
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Plant Physiology 89:180-183 (1989)
© 1989 American Society of Plant Biologists

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Environmental and Stress Physiology

Collapse of ATP-Induced pH Gradient by Sodium Ions in Microsomal Membrane Vesicles Prepared from Atriplex gmelini Leaves

Possibility of Na+/H+ Antiport

Toru Matoh, Takayuki Ishikawa and Eiichi Takahashi

Plant Nutrition Laboratory, Department of Agricultural Chemistry, Faculty of Agriculture, Kyoto University, Kyoto 606, Japan

Sealed microsomal membrane vesicles were prepared from leaves of a 250 millimolar NaCl-grown halophyte (Atriplex gmelini C. A. Mey). The vesicles exhibited ATP-dependent proton-transporting activity which was inhibited 60% by NO3– (50 millimolar) but not by vanadate (100 micromolar) and 23% by oligomycin (10 micrograms per milliliter), suggesting that tonoplast-derived vesicles were the major constituents of the preparation. The pH gradient established by the vesicles by ATP in the presence of oligomycin collapsed upon the addition of Na+ salts. The vesicles took up Na+ ions in the presence of ATP and this activity was canceled by gramicidin. These results suggest that Na+ ions were taken up by the vesicles via a Na+-specific uptake system, possibly a Na+/H+ antiport.




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G. E. Parks, M. A. Dietrich, and K. S. Schumaker
Increased vacuolar Na+/H+ exchange activity in Salicornia bigelovii Torr. in response to NaCl
J. Exp. Bot., May 1, 2002; 53(371): 1055 - 1065.
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