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

journal contribution
posted on 2023-05-16, 20:59 authored by Chen, Z, Pottosin, II, Tracey Cuin, Fuglsang, AT, Tester, M, Jha, D, Zepeda-Jazo, I, Meixue ZhouMeixue Zhou, Palmgren, MG, Ian NewmanIan Newman, Sergey ShabalaSergey Shabala
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.

Funding

Grains Research & Development Corporation

History

Publication title

Plant Physiology

Volume

145

Issue

4

Pagination

1714-1725

ISSN

0032-0889

Department/School

Tasmanian Institute of Agriculture (TIA)

Publisher

American Society of Plant Biologists

Place of publication

United States

Repository Status

  • Restricted

Socio-economic Objectives

Barley

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