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Plant Physiology 66:46-50 (1980)
© 1980 American Society of Plant Biologists

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Articles

Plasmalemma Transport of OH– in Chara corallina

III. FURTHER STUDIES ON TRANSPORT SUBSTRATE AND DIRECTIONALITY 1

William J. Lucas

Jack M. Ferrier

Department of Botany, University of California Davis, California, 95616, Department of Botany, University of Toronto, Toronto, Ontario M5S 1A1 Canada

The identity of the plasmalemma-transported species that develops the alkaline bands of Chara corallina was investigated. The effect of fusicoccin on the rate of HCO3– assimilation, and on the time-dependent alkaline band pH buildup following low pH flushing, was found to be small, with no stimulatory effect. Computer simulation of the flushing experiments showed that in the experimental situation the alkaline band transport system was slowed down, rather than speeded up, by low pH flushing. A detailed theoretical examination of the maximum rate of proton production from water showed that measured alkaline band fluxes are too large to be explicable in terms of an H+ influx system. The experimental and theoretical results indicate that the plasmalemma transport of OH– ions is responsible for the measured negative external electric potential and alkalinity flux which are associated with the alkaline band phenomenon. Consequently, HCO3– influx across the characean plasmalemma must be charge-balanced by the efflux of OH– ions.

1 Supported by National Science Foundation Grant PCM 78-10474 (to W. J. L.), and National Research Council of Canada Grant A6459 (to J. Dainty).




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 Plant Cell PhysiolHome page
T. Shimmen and A. Wakabayashi
Involvement of Membrane Potential in Alkaline Band Formation by Internodal Cells of Chara corallina
Plant Cell Physiol., October 1, 2008; 49(10): 1614 - 1620.
[Abstract] [Full Text] [PDF]


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