Loading content, please wait..
loading..
Logo
Version 3.22
or
Publication Type J
Authors Ahmed, H. A. I., L. Shabala and S. Shabala
Title Tissue-specificity of ROS-induced K+ and Ca2+ fluxes in succulent stems of the perennial halophyte Sarcocornia quinqueflora in the context of salinity stress tolerance
Source Plant Physiology and Biochemistry
Language English
Author Keywords Reactive oxygen species Oxidative stress Salinity stress Ion flux Potassium Calcium Succulence Tissue-specificity Perennial halophytes plasma-membrane ca2+ physiological roles hydroxyl radicals ion-transport channels conductance involvement mechanisms parameters potassium Plant Sciences
Abstract The ability of halophytes to thrive under saline conditions implies efficient ROS detoxification and signalling. In this work, the causal relationship between key membrane transport processes involved in maintaining plant ionic homeostasis and oxidative stress tolerance was investigated in a succulent perennial halophyte Sarcocornia quinqueflora. The flux responses to oxidative stresses induced by either hydroxyl radicals (OH center dot) or hydrogen peroxide (H2O2) were governed largely by (1) the type of ROS applied; (2) the tissue-specific origin and function (parenchymatic or chlorenchymatic); and (3) the tissue location in respect to the suberized endodermal barrier. The latter implied significant differences in responses between outer (water storage-WS; palisade tissue-Pa) and inner (internal photosynthetic layer-IP; stele parenchyma-SP) stem tissues. The ability of the cell to retain K+ under OH center dot stress varied between different tissues and was ranked in the following descending order: WS>Pa>IP>SP. OH center dot always led to Ca2+ influx in all stem tissues, while treatment with H2O2 induced tissue-specific Ca2+ "signatures". The inner/outer K+ ratio was the highest (similar to 2.6) under the optimum NaCl dosage (200 mM) in comparison to non-saline (similar to 0.4) and severe (800 mM; similar to 0.7) conditions, implying that a higher K+ concentration in the inner tissues is important for optimum growth. The overall results demonstrate a clear link between plant anatomical structure and ability of its tissues to maintain ionic homeostasis, via modulating their ROS sensitivity.
Author Address [Ahmed, Hassan Ahmed Ibraheem; Shabala, Lana; Shabala, Sergey] Univ Tasmania, Tasmanian Inst Agr, Hobart, Tas 7005, Australia. [Ahmed, Hassan Ahmed Ibraheem] Port Said Univ, Fac Sci, Dept Bot, Port Said 42526, Egypt. [Shabala, Sergey] Foshan Univ, Int Res Ctr Environm Membrane Biol, Foshan 528000, Peoples R China. Shabala, S (corresponding author), Univ Tasmania, Tasmanian Inst Agr, Hobart, Tas 7005, Australia. hassan.ahmed@utas.edu.au; Sergey.Shabala@utas.edu.au
ISSN 0981-9428
ISBN 0981-9428
29-Character Source Abbreviation Plant Physiol. Biochem.
Publication Date Sep
Year Published 2021
Volume 166
Beginning Page 1022-1031
Digital Object Identifier (DOI) 10.1016/j.plaphy.2021.07.006
Unique Article Identifier WOS:000692319900041

LEGAL NOTICES — This website is protected by Copyright © The University of Sussex, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021. The eHALOPH database is protected by Database Right and Copyright © The University of Sussex and other contributors, 2006, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021. This database is based on an earlier work by James Aronson.
THIS WEBSITE AND THIS DATABASE ARE PROVIDED ON AN "AS IS" BASIS, AND YOU USE THEM AND RELY ON THEM AT YOUR OWN RISK.

Contact email: halophytes@sussex.ac.uk
Credits – Tim Flowers, Joaquim Santos, Moritz Jahns, Brian Warburton, Peter Reed