Journal
FEBS LETTERS
Volume 588, Issue 21, Pages 3918-3923Publisher
WILEY
DOI: 10.1016/j.febslet.2014.09.003
Keywords
SV channel; Choline; Glycine betaine; Proline; Salinity stress; Adaptation
Funding
- CONACYT (Mexico) and Australian Research Council
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Activity of tonoplast slow vacuolar (SV, or TPC1) channels has to be under a tight control, to avoid undesirable leak of cations stored in the vacuole. This is particularly important for salt-grown plants, to ensure efficient vacuolar Na+ sequestration. In this study we show that choline, a cationic precursor of glycine betaine, efficiently blocks SV channels in leaf and root vacuoles of the two chenopods, Chenopodium quinoa (halophyte) and Beta vulgaris (glycophyte). At the same time, betaine and proline, two major cytosolic organic osmolytes, have no significant effect on SV channel activity. Physiological implications of these findings are discussed. (C) 2014 Federation of European Biochemical Societies. Published by Elsevier B.V. All rights reserved.
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