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Choline but not its derivative betaine blocks slow vacuolar channels in the halophyte Chenopodium quinoa: Implications for salinity stress responses

journal contribution
posted on 2023-05-18, 07:03 authored by Pottosin, I, Bonales-Alatorre, E, Sergey ShabalaSergey Shabala
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.

History

Publication title

FEBS Letters

Volume

588

Issue

21

Pagination

3918-3923

ISSN

0014-5793

Department/School

Tasmanian Institute of Agriculture (TIA)

Publisher

Elsevier Science Bv

Place of publication

Po Box 211, Amsterdam, Netherlands, 1000 Ae

Rights statement

Copyright 2014 Federation of European Biochemical Societies. Published by Elsevier B.V.

Repository Status

  • Restricted

Socio-economic Objectives

Grains and seeds not elsewhere classified

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