Tonoplast Aquaporins Facilitate NH^sub 3^ Transport

From: Plant Physiology | Date: February 1, 2005| Author: Minorsky, Peter V | Copyright information

The physiological processes underlying the removal of ammonia and ammonium from the cytosol of plant cells are poorly understood. Loqué et al. (pp. 671-680) propose that the accumulation of ammonium in the acidic lumen of the vacuole is best explained by an acid-trap mechanism, in which the NH^sub 3^ diffusing across the vacuolar membrane subsequently binds a proton to form NH^sub 4^^sup +^. But by what mechanism does NH^sub 3^ diffuse across the vacuolar membrane? By means of three differen...

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