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Root Plasma Membrane Transporters Controlling K+/Na+ Homeostasis in Salt-Stressed Barley╣ [C] [W]

Citation

Chen, Z and Pottosin, II and Cuin, TA and Fuglsang, AT and Tester, M and Jha, D and Zepeda-Jazo, I and Zhou, M and Palmgren, MG and Newman, IA and Shabala, SN, Root Plasma Membrane Transporters Controlling K+/Na+ Homeostasis in Salt-Stressed Barley [C] [W] , Plant Physiology, 145, (4) pp. 1714-1725. ISSN 0032-0889 (2007) [Refereed Article]

DOI: doi:10.1104/pp.107.110262

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. ┬ę 2007 American Society of Plant Biologists.

Item Details

Item Type:Refereed Article
Research Division:Agricultural and Veterinary Sciences
Research Group:Crop and Pasture Production
Research Field:Crop and Pasture Improvement (Selection and Breeding)
Objective Division:Plant Production and Plant Primary Products
Objective Group:Winter Grains and Oilseeds
Objective Field:Barley
Author:Chen, Z (Mr Zhonghua Chen)
Author:Cuin, TA (Dr Tracey Cuin)
Author:Zhou, M (Associate Professor Meixue Zhou)
Author:Newman, IA (Dr Ian Newman)
Author:Shabala, SN (Professor Sergey Shabala)
ID Code:49928
Year Published:2007
Web of Science® Times Cited:180
Deposited By:Agricultural Science
Deposited On:2007-08-01
Last Modified:2009-08-06
Downloads:0

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