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https://hdl.handle.net/2440/43754
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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 1532-2548 |
Statement of Responsibility: | 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 Protoplasts Hordeum Plant Epidermis Plant Roots Sodium Chloride Potassium Sodium Sodium Radioisotopes Tetraethylammonium Potassium Channels Proton Pumps Patch-Clamp Techniques Adaptation, Physiological Membrane Potentials Homeostasis Genotype Salinity |
Description: | Copyright © 2007 American Society of Plant Biologists |
Provenance: | First published online October 26, 2007. |
DOI: | 10.1104/pp.107.110262 |
Published version: | http://dx.doi.org/10.1104/pp.107.110262 |
Appears in Collections: | Agriculture, Food and Wine publications Aurora harvest |
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