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Root plasma membrane transporters controlling K+/Na+ homeostasis in salt-stressed barley
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, 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.
Item Details
Item Type: | Refereed Article |
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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 |
Downloads: | 0 |
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