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ROS homeostasis in halophytes in the context of salinity stress tolerance
Citation
Bose, J and Rodrigo-Moreno, A and Shabala, S, ROS homeostasis in halophytes in the context of salinity stress tolerance, Journal of Experimental Botany, 65, (5) pp. 1241-1257. ISSN 0022-0957 (2014) [Refereed Article]
Copyright Statement
Copyright 2013 The Author
Abstract
Halophytes are defined as plants that are adapted to live in soils containing high concentrations of salt and benefiting
from it, and thus represent an ideal model to understand complex physiological and genetic mechanisms of salinity
stress tolerance. It is also known that oxidative stress signalling and reactive oxygen species (ROS) detoxification are
both essential components of salinity stress tolerance mechanisms. This paper comprehensively reviews the differences
in ROS homeostasis between halophytes and glycophytes in an attempt to answer the questions of whether
stress-induced ROS production is similar between halophytes and glycophytes; is the superior salinity tolerance in
halophytes attributed to higher antioxidant activity; and is there something special about the specific ‘pool’ of enzymatic
and non-enzymatic antioxidants in halophytes. We argue that truly salt-tolerant species possessing efficient
mechanisms for Na+ exclusion from the cytosol may not require a high level of antioxidant activity, as they simply do
not allow excessive ROS production in the first instance. We also suggest that H2O2 ‘signatures’ may operate in plant
signalling networks, in addition to well-known cytosolic calcium ‘signatures’. According to the suggested concept,
the intrinsically higher superoxide dismutase (SOD) levels in halophytes are required for rapid induction of the H2O2
‘signature’, and to trigger a cascade of adaptive responses (both genetic and physiological), while the role of other
enzymatic antioxidants may be in decreasing the basal levels of H2O2, once the signalling has been processed. Finally,
we emphasize the importance of non-enzymatic antioxidants as the only effective means to prevent detrimental
effects of hydroxyl radicals on cellular structures.
Item Details
Item Type: | Refereed Article |
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Keywords: | oxidative stress, ROS, halophytes, antioxidant, hydrogen peroxide, hydroxyl radical, ionic homeostasis, oxidative stress, plasma membrane, potassium, programmed cell death, ROS scavenging, sodium |
Research Division: | Biological Sciences |
Research Group: | Plant biology |
Research Field: | Plant physiology |
Objective Division: | Plant Production and Plant Primary Products |
Objective Group: | Other plant production and plant primary products |
Objective Field: | Other plant production and plant primary products not elsewhere classified |
UTAS Author: | Bose, J (Dr Jayakumar Bose) |
UTAS Author: | Shabala, S (Professor Sergey Shabala) |
ID Code: | 93061 |
Year Published: | 2014 |
Web of Science® Times Cited: | 449 |
Deposited By: | Tasmanian Institute of Agriculture |
Deposited On: | 2014-07-09 |
Last Modified: | 2017-11-02 |
Downloads: | 0 |
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