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Na+-K+ transport in roots under salt stress


Zepeda-Jaso, I and Shabala, SN and Chen, Z and Pottosin, II, Na+-K+ transport in roots under salt stress, Plant Signalling & Behavior, 3, (6) pp. 401-403. ISSN 1559-2316 (2008) [Refereed Article]

DOI: doi:10.1104/pp.107.110262


Salinity causes billion dollar losses in annual crop production. So far, the main avenue in breeding crops for salt tolerance has been to reduce Na+ uptake and transport from roots to shoots. Recently we have demonstrated that retention of cytosolic K+ could be considered as another key factor in conferring salt tolerance in plants. A subsequent study has shown that Na+-induced K+ efflux in barley root epidermis occurs primarily via outward rectifying K+ channels (KORC). Surprisingly, expression of KORC was similar in salt- tolerant and sensitive genotypes. However, the former were able to better oppose Na+-induced depolarization via enhanced activity of plasma membrane H+-ATPaSe (thus minimizing K+ leak from the cytosol). In addition to highly K+-selective KORC channels, activities of several types of non-selective cation channels were detected at depolarizing potentials. Here we show that the expression of one of them, NORC, was significantly lower in salt-tolerant genotypes. As NORC is capable of mediating K+ efflux coupled to Na+ influx, we suggest that the restriction of its activity could be beneficial for plants under salt stress.

Item Details

Item Type:Refereed Article
Research Division:Biological Sciences
Research Group:Plant biology
Research Field:Plant physiology
Objective Division:Plant Production and Plant Primary Products
Objective Group:Grains and seeds
Objective Field:Barley
UTAS Author:Shabala, SN (Professor Sergey Shabala)
UTAS Author:Chen, Z (Mr Zhonghua Chen)
ID Code:53874
Year Published:2008
Funding Support:Australian Research Council (DP0449856)
Deposited By:Agricultural Science
Deposited On:2009-01-16
Last Modified:2019-12-11

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