The coordinated regulation of Na+ and K+ in Hordeum brevisubulatum responding to time of salt stress
Copyright © 2016 Elsevier Ireland Ltd. All rights reserved.
| Publié dans: | Plant science : an international journal of experimental plant biology. - 1985. - 252(2016) vom: 01. Nov., Seite 358-366 |
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| Auteur principal: | |
| Autres auteurs: | , , , , , , , , , , , |
| Format: | Article en ligne |
| Langue: | English |
| Publié: |
2016
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| Accès à la collection: | Plant science : an international journal of experimental plant biology |
| Sujets: | Journal Article Coordinated ion regulation K(+) influx Na(+) efflux Na(+) secretion Rapid Na(+) accumulation Sodium Chloride 451W47IQ8X Sodium 9NEZ333N27 plus... |
| Résumé: | Copyright © 2016 Elsevier Ireland Ltd. All rights reserved. Hordeum brevisubulatum, called as wild barley, is a useful monocotyledonous halophyte for soil improvement in northern China. Although previously studied, its main salt tolerance mechanism remained controversial. The current work showed that shoot Na+ concentration was increased rapidly with stress time and significantly higher than in wheat during 0-168h of 100mM NaCl treatment. Similar results were also found under 25 and 50mM NaCl treatments. Even K+ was increased from 0.01 to 50mM in the cultural solution, no significant effect was found on tissue Na+ concentrations. Interestingly, shoot growth was improved, and stronger root activity was maintained in H. brevisubulatum compared with wheat after 7days treatment of 100mM NaCl. To investigate the long-term stress impact on tissue Na+, 100mM NaCl was prolonged to 60 days. The maximum values of Na+ concentrations were observed at 7th in shoot and 14th day in roots, respectively, and then decreased gradually. Micro-electrode ion flux estimation was used and it was found that increasing Na+ efflux while maintaining K+ influx were the major strategies to reduce the Na+ concentration during long-term salt stress. Moreover, leaf Na+ secretions showed little contribution to the tissue Na+ decrease. Thereby, the physiological mechanism for H. brevisubulatum to survive from long-term salt stress was proposed that rapid Na+ accumulation occurred in the shoot to respond the initial salt shock, then Na+ efflux was triggered and K+ influx was activated to maintain a stable K+/Na+ ratio in tissues |
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| Description: | Date Completed 17.04.2017 Date Revised 30.03.2022 published: Print-Electronic Citation Status MEDLINE |
| ISSN: | 1873-2259 |
| DOI: | 10.1016/j.plantsci.2016.08.009 |