Photosynthetic HCO(3) Utilization and OH Excretion in Aquatic Angiosperms: LIGHT-INDUCED pH CHANGES AT THE LEAF SURFACE |
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| Authors: | Prins H B Snel J F Helder R J Zanstra P E |
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| Affiliation: | Department of Plant Physiology, University of Groningen, P. O. Box 14, 9750 AA Haren (Gn.), The Netherlands. |
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| Abstract: | The utilization of HCO3− as carbon source for photosynthesis by aquatic angiosperms results in the production of 1 mole OH− for each mole CO2 assimilated. The OH− ions are subsequently released to the medium. In several Potamogeton and Elodea species, the site of the HCO3− influx and OH− efflux are spatially separated. Described here are light- and dark-induced pH changes at the lower and upper epidermis of the leaves of Potamogeton lucens, Elodea densa, and Elodea canadensis. |
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