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Hydrogen peroxide-induced root Ca2+ and K+ fluxes correlate with salt tolerance in cereals: towards the cell-based phenotyping

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Wang, H, Shabala, L ORCID: 0000-0002-5360-8496, Zhou, M ORCID: 0000-0003-3009-7854 and Shabala, S ORCID: 0000-0003-2345-8981 2018 , 'Hydrogen peroxide-induced root Ca2+ and K+ fluxes correlate with salt tolerance in cereals: towards the cell-based phenotyping' , International Journal of Molecular Sciences, vol. 19, no. 3 , pp. 1-18 , doi: 10.3390/ijms19030702.

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Abstract

Salinity stress-induced production of reactive oxygen species (ROS) and associated oxidative damage is one of the major factors limiting crop production in saline soils. However, the causal link between ROS production and stress tolerance is not as straightforward as one may expect, as ROS may also play an important signaling role in plant adaptive responses. In this study, the causal relationship between salinity and oxidative stress tolerance in two cereal crops—barley (Hordeum vulgare) and wheat (Triticum aestivum)—was investigated by measuring the magnitude of ROS-induced net K+ and Ca2+ fluxes from various root tissues and correlating them with overall whole-plant responses to salinity. We have found that the association between flux responses to oxidative stress and salinity stress tolerance was highly tissue specific, and was also dependent on the type of ROS applied. No correlation was found between root responses to hydroxyl radicals and the salinity tolerance. However, when oxidative stress was administered via H2O2 treatment, a significant positive correlation was found for the magnitude of ROS-induced K+ efflux and Ca2+ uptake in barley and the overall salinity stress tolerance, but only for mature zone and not the root apex. The same trends were found for wheat. These results indicate high tissue specificity of root ion fluxes response to ROS and suggest that measuring the magnitude of H2O2-induced net K+ and Ca2+ fluxes from mature root zone may be used as a tool for cell-based phenotyping in breeding programs aimed to improve salinity stress tolerance in cereals.

Item Type: Article
Authors/Creators:Wang, H and Shabala, L and Zhou, M and Shabala, S
Keywords: ion flux, reactive oxygen species, barley, wheat, oxidative stress, salinity stress, microelectrode ion flux estimation
Journal or Publication Title: International Journal of Molecular Sciences
Publisher: Molecular Diversity Preservation International
ISSN: 1422-0067
DOI / ID Number: 10.3390/ijms19030702
Copyright Information:

Copyright 2018 The Authors. Licensed under Creative Commons Attribution 4.0 International (CC BY 4.0) https://creativecommons.org/licenses/by/4.0/

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