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K+Nutrition and Na+Toxicity: The Basis of Cellular K+/Na+Ratios

K+Nutrition and Na+Toxicity: The Basis of Cellular K+/Na+Ratios The capacity of plants to maintain a high cytosolic K+/Na+ratio is likely to be one of the key determinants of plant salt tolerance. Important progress has been made in recent years regarding the identification and characterization of genes and transporters that contribute to the cytosolic K+/Na+ratio. For K+uptake, K+efflux and K+translocation to the shoot, genes have been isolated that encode K+uptake and K+release ion channels and K+carriers that are coupled to either a H+or Na+gradient. Although the picture is less clear for the movement of Na+, one pathway, in the form of non-selective ion channels, is likely to play a role in Na+uptake, whereas Na+efflux and compartmentation are likely to be mediated by H+-coupled antiport. In addition, several proteins have been characterized that play prominent roles in the regulation of K+and/or Na+fluxes. In this Botanical Briefing we will discuss the functions and interactions of these genes and transporters in the broader context of K+nutrition and Na+toxicity. Copyright 1999 Annals of Botany Company http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Annals of Botany Oxford University Press

K+Nutrition and Na+Toxicity: The Basis of Cellular K+/Na+Ratios

Annals of Botany , Volume 84 (2) – Aug 1, 1999

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References (61)

Publisher
Oxford University Press
Copyright
© Published by Oxford University Press.
ISSN
0305-7364
eISSN
1095-8290
DOI
10.1006/anbo.1999.0912
Publisher site
See Article on Publisher Site

Abstract

The capacity of plants to maintain a high cytosolic K+/Na+ratio is likely to be one of the key determinants of plant salt tolerance. Important progress has been made in recent years regarding the identification and characterization of genes and transporters that contribute to the cytosolic K+/Na+ratio. For K+uptake, K+efflux and K+translocation to the shoot, genes have been isolated that encode K+uptake and K+release ion channels and K+carriers that are coupled to either a H+or Na+gradient. Although the picture is less clear for the movement of Na+, one pathway, in the form of non-selective ion channels, is likely to play a role in Na+uptake, whereas Na+efflux and compartmentation are likely to be mediated by H+-coupled antiport. In addition, several proteins have been characterized that play prominent roles in the regulation of K+and/or Na+fluxes. In this Botanical Briefing we will discuss the functions and interactions of these genes and transporters in the broader context of K+nutrition and Na+toxicity. Copyright 1999 Annals of Botany Company

Journal

Annals of BotanyOxford University Press

Published: Aug 1, 1999

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