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K+ retention in leaf mesophyll, an overlooked component of salinity tolerance mechanism: a case study for barley
Citation
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
Abstract
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 |
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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: | 75 |
Deposited By: | Tasmanian Institute of Agriculture |
Deposited On: | 2014-07-31 |
Last Modified: | 2017-11-02 |
Downloads: | 0 |
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