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The energy cost of the tonoplast futile sodium leak

Shabala, S ORCID: 0000-0003-2345-8981, Chen, G, Chen, ZH and Pottosin, I 2020 , 'The energy cost of the tonoplast futile sodium leak' , New Phytologist, vol. 225, no. 3 , pp. 1105-1110 , doi: 10.1111/nph.15758.

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Abstract

Active removal of Na+ from the cytosol into the vacuole plays a critical role in salinity tissue tolerance, but another, often neglected component of this trait is Na+ retention in vacuoles. This retention is based on an efficient control of Na+‐permeable slow‐ and fast‐vacuolar channels that mediate the back‐leak of Na+ into cytosol and, if not regulated tightly, could result in a futile cycle. This Tansley insight summarizes our current knowledge of regulation of tonoplast Na+‐permeable channels and discusses the energy cost of vacuolar Na+ sequestration, under different scenarios. We also report on a phylogenetic and bioinformatic analysis of the plant two‐pore channel family and the difference in its structure and regulation between halophytes and glycophytes, in the context of salinity tolerance.

Item Type: Article
Authors/Creators:Shabala, S and Chen, G and Chen, ZH and Pottosin, I
Keywords: H+-ATPase, halophyte, salinity stress, tonoplast ion channels, two-pore channel 1 (TPC1), vacuolar sodium sequestration, tonoplast, SV, VF
Journal or Publication Title: New Phytologist
Publisher: Blackwell Publishing Ltd
ISSN: 0028-646X
DOI / ID Number: 10.1111/nph.15758
Copyright Information:

Copyright 2019 the authors

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