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Plasmalemma transport of OH− inChara corallina

Dynamics of activation and deactivation

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Summary

The light-mediated, time-dependent rise in the pH value at the center of an alkaline band was analyzed using the methods of numerical analysis. From this analysis an expression of the time-dependent build-up of OH− efflux was obtained for these bands. This information can now be employed to determine whether the light-activated transport of OH− and HCO −3 influences the electrical properties of the plasmalemma. The dark-induced deactivation of OH− transport was also characterized, revealing a transition from efflux to a transient influx phase during deactivation.

Numerical analysis of the steady-state OH− diffusion pattern, established along the surface of an alkaline band, revealed that the OH− efflux width was wider than previously envisaged. It was also found that OH− sink regions exist on either side of the efflux zone. These, and other characteristics revealed by the numerical analysis, enabled us to extend the OH− transport model proposed by Lucas (J. Exp. Bot. 1975,26:347).

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Authors and Affiliations

  1. Department of Botany, University of Toronto, Toronto, Ontario, Canada

    W. J. Lucas, J. M. Ferrier & J. Dainty

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  1. W. J. Lucas
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  2. J. M. Ferrier
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  3. J. Dainty
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Lucas, W.J., Ferrier, J.M. & Dainty, J. Plasmalemma transport of OH− inChara corallina . J. Membrain Biol. 32, 49–73 (1977). https://doi.org/10.1007/BF01905209

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  • DOI: https://doi.org/10.1007/BF01905209

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