Journal
PLANT SCIENCE
Volume 172, Issue 6, Pages 1218-1225Publisher
ELSEVIER IRELAND LTD
DOI: 10.1016/j.plantsci.2007.02.013
Keywords
Suaeda salsa; salt tolerance; V-H+-ATPase activity; N+/H+ antiporter activity
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The strategy of Suaeda salsa adaptation to high salinity was shown in this study. Our results firstly demonstrated that Na+ was a beneficial element rather than toxic ion for S. salsa plants. The biomass of S. salsa seedlings increased significantly after salt-treatment (100-400 mmol/L NaCl). Secondly, S. salsa had strong ability to accumulate Na+ under saline condition. Ninety-four percent of Na+ absorbed by salt-treated S. salsa plant accumulated in the shoot, especially in the leaves, and 98% of Na+ in the leaves accumulated in leaf symplast. Thirdly, measurement on isolated tonoplast-enriched membrane vesicles derived from the leaves of S. salsa showed that increased V-H+-ATPase hydrolytic activity, V-H+-ATPase proton pump activity and the tonoplast Na+/H+ antiport activity were found in salt-treated leaves compared with the control leaves. Upregulation of the tonoplast Na+/H+ antiport activity was due to increase of both transcription and translation. These results suggested that coordinate up-regulation of V-H+-ATPase activity and Na+/H+ antiporter activity play a pivotal role in Na+ sequestering into vacuoles of S. salsa. (C) 2007 Elsevier Ireland Ltd. All rights reserved.
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