Journal Article

The effects of ABA on channel‐mediated K<sup>+</sup> transport across higher plant roots

Stephen K. Roberts and Benjamin N. Snowman

in Journal of Experimental Botany

Published on behalf of Society for Experimental Biology

Volume 51, issue 350, pages 1585-1594
Published in print September 2000 | ISSN: 0022-0957
Published online September 2000 | e-ISSN: 1460-2431 | DOI: http://dx.doi.org/10.1093/jexbot/51.350.1585
The effects of ABA on channel‐mediated K+ transport across higher plant roots

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The transport and accumulation of K+ in higher plant roots is regulated by ABA. Molecular and electrophysiological techniques have identified a number of discrete transporters which are involved in the translocation of K+ from the soil solution to the shoots of higher plants. Furthermore, recent reports have shown that ABA regulates K+ channel activity in maize and Arabidopsis roots which suggests that ABA regulation of K+ transport in roots is, at least in part, ion channel‐mediated. The signalling processes which underlie the ABA regulation of K+ channels have been investigated. The effects of ABA on the membrane potential of intact maize root cells were also studied. It was found that ABA regulated the membrane potential of root cells and that this regulation is consistent with the hypothesis that ABA‐induced K+ accumulation in roots is mediated by K+ channels.

Keywords: ABA; K+ channels; roots; maize.

Journal Article.  7642 words.  Illustrated.

Subjects: Plant Sciences and Forestry

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