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Published on October 26, 2007; 10.1104/pp.107.110262

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Received October 1, 2007
Accepted October 23, 2007

Root plasma membrane transporters controlling K+/Na+ homeostasis in salt stressed barley

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 *

School of Agricultural Science and School of Mathematics and Physics, University of Tasmania, Hobart, Australia; Centro Universitario de Investigaciones Biomedicas, Universidad de Colima, Colima, Mexico; Department of Plant Biology, University of Copenhagen, Thorvaldsensvej 40, DK-1871 Frederiksberg C, Denmark; Australian Centre for Plant Functional Genomics, University of Adelaide, Glen Osmond, Australia; Tasmanian Institute of Agricultural Research, University of Tasmania, Kings Meadows, Australia

* Corresponding author; email: Sergey.Shabala{at}utas.edu.au.

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, multiple mechanisms are well combined in order 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; (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+ (KOR) channels. Overall, our results are consistent with the idea of the cytosolic K+/Na+ ratio being a key determinant of plant salinity tolerance, and suggest multiple pathways of controlling that important feature in salt-tolerant plants.




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