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K+ retention in leaf mesophyll, an overlooked component of salinity tolerance mechanism: a case study for barley


Wu, H and Zhu, M and Shabala, L and Zhou, M and Shabala, S, K+ retention in leaf mesophyll, an overlooked component of salinity tolerance mechanism: a case study for barley, Journal of Integrative Plant Biology, 57, (2) pp. 171-185. ISSN 1672-9072 (2015) [Refereed Article]

Copyright Statement

2014 Institute of Botany, Chinese Academy of Sciences

DOI: doi:10.1111/jipb.12238


Plant salinity tolerance is a physiologically complex trait, with numerous mechanisms contributing to it. In this work we show that the ability of leaf mesophyll to retain K+ represents an important and essentially overlooked component of a salinity tolerance mechanism. The strong positive correlation between mesophyll K+ retention ability under saline conditions (quantified by the magnitude of NaCl-induced K+ efflux from mesophyll) and the overall salinity tolerance (relative fresh weight and/or survival or damage under salinity stress) was found while screening 46 barley (Hordeum vulgare L.) genotypes contrasting in their salinity tolerance. Genotypes with intrinsically higher leaf K+ content under control conditions were found to possess better K+ retention ability under salinity and, hence, overall higher tolerance. Contrary to previous reports for barley roots, K+ retention in mesophyll was not associated with an increased H+-pumping in tolerant varieties but instead correlated negatively with this trait. These findings are explained by the fact that increased H+ extrusion may be needed to charge balance the activity and provide the driving force for the high affinity HAK/KUP K+ transporters required to restore cytosolic K+ homeostasis in salt-sensitive genotypes.

Item Details

Item Type:Refereed Article
Keywords:potassium retention, barley, salinity tolerance
Research Division:Biological Sciences
Research Group:Plant biology
Research Field:Plant physiology
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the biological sciences
UTAS Author:Wu, H (Mr Honghong Wu)
UTAS Author:Zhu, M (Ms Min Zhu)
UTAS Author:Shabala, L (Associate Professor Lana Shabala)
UTAS Author:Zhou, M (Professor Meixue Zhou)
UTAS Author:Shabala, S (Professor Sergey Shabala)
ID Code:93410
Year Published:2015
Web of Science® Times Cited:90
Deposited By:Tasmanian Institute of Agriculture
Deposited On:2014-07-31
Last Modified:2017-11-02

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