Abstract
ABSTRACTUpon addition of nitrate and ammonium, respectively, to the bath of intact ‘low salt’ maize plants, the cortical membrane potential and the trans‐root potential changed in a similar and synchronous way as revealed by applying conventional microelectrode techniques and the xylem pressure‐potential probe ( Wegner & Zimmermann 1998). Upon addition of nitrate, a hyperpolarization response was observed which was frequently preceded by a short depolarization phase. In contrast, addition of ammonium resulted in an overall depolarization response both of the cortical membrane potential and the trans‐root potential. The nitrate‐induced hyperpolarization response and the depolarization following the addition of ammonium were concentration‐dependent.The data suggest that a tight electrical coupling exists between the cellular and tissue level in the root of the intact plant and that the resistance of the cellular (symplastic) space is much less than the resistance of the apoplast.
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