K+ deprivation induces xylem water and K+ transport in sunflower : evidence for a co-ordinated control
The effect of K+ deprivation on water and K+ transport in roots was studied in sunflower plants. Deprivation was achieved in two different ways: by removing K+ from the growth medium for varying intervals; and by growing plants permanently in a low-K+ medium. Removal of K+ from the growth medium for...
| Publié dans: | Journal of experimental botany. - 1985. - 61(2010), 1 vom: 27., Seite 157-64 |
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| Auteur principal: | |
| Autres auteurs: | , |
| Format: | Article en ligne |
| Langue: | English |
| Publié: |
2010
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| Accès à la collection: | Journal of experimental botany |
| Sujets: | Journal Article Research Support, Non-U.S. Gov't Plant Exudates Solutions Water 059QF0KO0R Potassium RWP5GA015D |
| Résumé: | The effect of K+ deprivation on water and K+ transport in roots was studied in sunflower plants. Deprivation was achieved in two different ways: by removing K+ from the growth medium for varying intervals; and by growing plants permanently in a low-K+ medium. Removal of K+ from the growth medium for a few hours prompted a significant increase in xylem sap exudation, associated with an increase in root hydraulic conductivity; however, it did not give rise to any significant change in plant K+ content, nor did it favour root K+ exudation. By contrast, prolonged K+ deprivation led to a decline in the internal K+ content and stimulated water and K+ transport in roots. Leaf application of K+ (Rb+) in plants grown permanently in a low-K+ medium inhibited the effect of K+ deprivation on root water and K+ transport, without significantly modifying the internal K+ content of the plants. This treatment had no effect on normal-K+ plants. These results suggest the existence of mechanisms enabling perception of plant K+ status and/or K+ availability in the medium, which trigger transduction processes governing the transport of water and K+ from the root to the shoot |
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| Description: | Date Completed 09.03.2010 Date Revised 21.11.2013 published: Print Citation Status MEDLINE |
| ISSN: | 1460-2431 |
| DOI: | 10.1093/jxb/erp288 |