Root plasma membrane transporters controlling K⁺/Na⁺ homeostasis in salt-stressed bBarley^1[C][W]

TY - JOUR

T1 - Root plasma membrane transporters controlling K+/Na+ homeostasis in salt-stressed bBarley1[C][W]

AU - Chen, Zhonghua

AU - Pottosin, Igor I.

AU - Cuin, Tracey A.

AU - Fuglsang, Anja Thoe

AU - Tester, Mark

AU - Jha, Deepa

AU - Zepeda-Jazo, Isaac

AU - Zhou, Meixue

AU - Palmgren, Michael Gjedde

AU - Newman, Ian A.

AU - Shabala, Sergey

PY - 2007

Y1 - 2007

N2 - Plant salinity tolerance is a polygenic trait with contributions from genetic, developmental, and physiological interactions, inaddition 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 H1 pump activity;(3) better ability of root cells to pump Na1 from the cytosol to the external medium; and (4) higher sensitivity to supplementalCa21. At the same time, no significant difference was found between contrasting cultivars in their unidirectional 22Na1 influx or inthe density and voltage dependence of depolarization-activated outward-rectifying K1 channels. Overall, our results are consistentwith the idea of the cytosolic K1-to-Na1 ratio being a key determinant of plant salinity tolerance, and suggest multiplepathways of controlling that important feature in salt-tolerant plants.

AB - Plant salinity tolerance is a polygenic trait with contributions from genetic, developmental, and physiological interactions, inaddition 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 H1 pump activity;(3) better ability of root cells to pump Na1 from the cytosol to the external medium; and (4) higher sensitivity to supplementalCa21. At the same time, no significant difference was found between contrasting cultivars in their unidirectional 22Na1 influx or inthe density and voltage dependence of depolarization-activated outward-rectifying K1 channels. Overall, our results are consistentwith the idea of the cytosolic K1-to-Na1 ratio being a key determinant of plant salinity tolerance, and suggest multiplepathways of controlling that important feature in salt-tolerant plants.

U2 - 10.1104/pp.107.110262

DO - 10.1104/pp.107.110262

M3 - Journal article

C2 - 17965172

SN - 0032-0889

VL - 145

SP - 1714

EP - 1725

JO - Plant Physiology

JF - Plant Physiology

IS - 4

ER -