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Type: Journal article
Title: Root plasma membrane transporters controlling K+/Na+ homeostasis in salt-stressed barley
Author: Chen, Z.
Pottosin, I.
Cuin, T.
Fuglsang, A.
Tester, M.
Jha, D.
Zepeda-Jazo, I.
Zhou, M.
Palmgren, M.
Newman, I.
Shabala, S.
Citation: Plant Physiology, 2007; 145(4):1714-1725
Publisher: Amer Soc Plant Physiologists
Issue Date: 2007
ISSN: 0032-0889
Statement of
Zhonghua Chen, Igor I. Pottosin, Tracey A. Cuin, Anja T. Fuglsang, Mark Tester, Deepa Jha, Isaac Zepeda-Jazo, Meixue Zhou, Michael G. Palmgren, Ian A. Newman and Sergey Shabala
Abstract: Plant salinity tolerance is a polygenic trait with contributions from genetic, developmental, and physiological interactions, in addition to interactions between the plant and its environment. In this study, we show that in salt-tolerant genotypes of barley (Hordeum vulgare), multiple mechanisms are well combined to withstand saline conditions. These mechanisms include: (1) better control of membrane voltage so retaining a more negative membrane potential; (2) intrinsically higher H+ pump activity; (3) better ability of root cells to pump Na+ from the cytosol to the external medium; and (4) higher sensitivity to supplemental Ca2+. At the same time, no significant difference was found between contrasting cultivars in their unidirectional 22Na+ influx or in the density and voltage dependence of depolarization-activated outward-rectifying K+ channels. Overall, our results are consistent with the idea of the cytosolic K+-to-Na+ ratio being a key determinant of plant salinity tolerance, and suggest multiple pathways of controlling that important feature in salt-tolerant plants.
Keywords: Cell Membrane
Plant Epidermis
Plant Roots
Sodium Chloride
Sodium Radioisotopes
Potassium Channels
Proton Pumps
Patch-Clamp Techniques
Adaptation, Physiological
Membrane Potentials
Description: Copyright © 2007 American Society of Plant Biologists
Provenance: First published online October 26, 2007.
DOI: 10.1104/pp.107.110262
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Appears in Collections:Agriculture, Food and Wine publications
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