ISSN:
1432-1424
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
,
Chemistry and Pharmacology
Notes:
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).
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01905209
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