The role of polyamines in the regulation of the plasma membrane and the tonoplast proton pumps under salt stress
Copyright 2009 Elsevier GmbH. All rights reserved.
| Veröffentlicht in: | Journal of plant physiology. - 1979. - 167(2010), 4 vom: 01. März, Seite 261-9 |
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| Weitere Verfasser: | , , |
| Format: | Online-Aufsatz |
| Sprache: | English |
| Veröffentlicht: |
2010
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| Zugriff auf das übergeordnete Werk: | Journal of plant physiology |
| Schlagworte: | Journal Article Polyamines Protein Subunits Proton Pumps RNA, Messenger Solutions Polyethylene Glycols 3WJQ0SDW1A Sodium Chloride 451W47IQ8X mehr... |
| Zusammenfassung: | Copyright 2009 Elsevier GmbH. All rights reserved. Polyamine content (PAs) often changes in response to abiotic stresses. It was shown that the accumulation of PAs decreased in roots treated for 24h with 200 mM NaCl. The role of polyamines (putrescine - PUT, spermidine - SPD and spermine - SPM) in the modification of the plasma membrane(PM) H(+)-ATPase (EC 3.6.3.6) and the vacuolar(V) H(+)-ATPase (EC 3.6.3.14) activities in cucumber roots treated with NaCl was investigated. 24h treatment of seedlings with 50 microM PUT, SPD or SPM lowered the activities of proton pumps in both membranes. The decreased H(+)-ATPase activity in plasma membranes isolated from the PA-treated roots was positively correlated with a lower level of PM-H(+)-ATPase CsHA3 transcript. However, transcript levels of PM-H(+)-ATPase CsHA2 and V-ATPase subunit A and c in roots treated with 50 microM PAs were similar to those in the control. Additionally, treatment of plants with salt markedly increased the activity of the PM- and V-H(+)-ATPases. However, exposure of plants to 20% PEG had no effect on these activities. These data suggest that, under salt stress conditions, the increase in H(+)-ATPase activities is caused mainly by the ionic component of salt stress. It seems that the main role of the PAs in the 24h salt-treated cucumber plants could be a result of their cationic character. The PA levels decreased when concentration of Na(+) increased, so action of PAs contributes to ionic equilibrium. Moreover, the decrease in the concentration of polyamines, which inhibit the PM-H(+)-ATPase and the V-H(+)-ATPase, at least under the studied conditions, seems to be beneficial. Thus, plants can increase salinity tolerance by modifying the biosynthesis of polyamines |
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| Beschreibung: | Date Completed 04.05.2010 Date Revised 30.09.2020 published: Print-Electronic Citation Status MEDLINE |
| ISSN: | 1618-1328 |
| DOI: | 10.1016/j.jplph.2009.09.010 |