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


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, Plant Physiology, 145, (4) pp. 1714-1725. ISSN 0032-0889 (2007) [Refereed Article]

DOI: doi:10.1104/pp.107.110262


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.

Item Details

Item Type:Refereed Article
Research Division:Agricultural, Veterinary and Food Sciences
Research Group:Crop and pasture production
Research Field:Crop and pasture improvement (incl. selection and breeding)
Objective Division:Plant Production and Plant Primary Products
Objective Group:Grains and seeds
Objective Field:Barley
UTAS Author:Chen, Z (Mr Zhonghua Chen)
UTAS Author:Cuin, TA (Dr Tracey Cuin)
UTAS Author:Zhou, M (Professor Meixue Zhou)
UTAS Author:Newman, IA (Dr Ian Newman)
UTAS Author:Shabala, SN (Professor Sergey Shabala)
ID Code:49928
Year Published:2007
Web of Science® Times Cited:342
Deposited By:Agricultural Science
Deposited On:2007-08-01
Last Modified:2019-12-11

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