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|Title:||Root plasma membrane transporters controlling K+/Na+ homeostasis in salt-stressed barley|
|Citation:||Plant Physiology, 2007; 145(4):1714-1725|
|Publisher:||Amer Soc Plant Physiologists|
|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.|
|Appears in Collections:||Agriculture, Food and Wine publications|
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