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© 1992 Oxford University Press

RESEARCH-ARTICLE

Coupling of Proton Fluxes in the Polar Leaves of Potamogeton lucens L

H. MIEDEMA1 and H. B. A. PRINS

Department of Plant Physiology, University of Gromngen P.O. Box 14, 9750 AA Haren, The Nethe

1To whom correspondence should be addressed.

An attempt has been made to quantify the light-induced H+ efflux and influx observed in polar leaves of Potamogeton lucens.These proton fluxes are spatially separated. The H+ efflux, mediated by a plasmalemma bound H+ –ATPase, occurs across theplasma membrane at the morphological lower epidermis and is accompanied by an H+ influx (or OH– efflux) at the upper side ofthe leaf. As a result, these leaves exhibit a remarkable pH–polarity in the light. The pH near the lower epidermis may drop to avalue as low as 3.5, while a pH of about 10.5 can be observed at the upper epidermis. Obviously this phenomenon requires theco–ordination of transport processes in the different cell layers of the leaf tissue. These observations led to quantitative studies ofthe relation between the H+ fluxes at either plasmalemma. These fluxes were calculated from the pH values recorded at twodistances from the leaf surface. Although the H+ influx always exceeded the efflux, a coupling between the transport processesacross either plasma membrane became evident from the time–courses of the two fluxes.

Key words: Potamogeton lucens, proton flux, flux coupling, pH–;polarity


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