Plant and Cell Physiology, ( ISI ), Volume (61), No (2), Year (2019-11) , Pages (403-415)

Title : ( Comparing Kinetics of Xylem Ion Loading and Its Regulation in Halophytes and Glycophytes )

Authors: Mahvash Zarei , Sergey Shabala , Fanrong Zeng , Xiaohui Chen , Shuo Zhang , Majid Azizi , Majid Rahemi , Sohrab Davarpanah , Min Yu , Lana Shabala ,

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Abstract

Although control of xylem ion loading is essential to confer salinity stress tolerance, specific details behind this process remain elusive. In this work, we compared kinetics of xylem Na+ and K+ loading between two halophytes (Atriplexlentiformis and quinoa) and two glycophyte (pea and beans) species, to understand the mechanistic basis of the above process. Halophyte plants had high initial amounts of Na+ in the leaf, even when grown in the absence of the salt stress. This was matched by 7-fold xylem sap Na+ concentration compared with glycophyte plants. Upon salinity exposure, the xylem sap Na+ concentration increased rapidly but transiently in halophytes, while in glycophytes this increase was much delayed. Electrophysiological experiments using the MIFE technique showed that glycophyte plants tend to re-absorb Na+ back into the stele, thus reducing xylem Na+ load at the early stages of salinity exposure. The halophyte plants, however, were capable to release Na+ even in the presence of high Na+ concentrations in the xylem. The presence of H2O2 (mimicking NaCl-stress induced ROS accumulation in the root) caused a massive Na+ and Ca2+uptake into the root stele, while triggering a substantial K+ efflux from the cytosol into apoplast in glycophyte but not halophytes species. The peak in H2O2 production was achieved faster in halophytes (30 min vs 4 h) and was attributed to the increased transcript levels of RbohE. Pharmacological data suggested that non-selective cation channels are unlikely play a major role in ROS-mediated xylem Na+ loading.

Keywords

, salinity stress; non, selective cation channel; H2O2; potassium; sodium; stele;
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@article{paperid:1076896,
author = {Zarei, Mahvash and Sergey Shabala and Fanrong Zeng and Xiaohui Chen and Shuo Zhang and Azizi, Majid and مجید راحمی and Davarpanah, Sohrab and Min Yu and Lana Shabala},
title = {Comparing Kinetics of Xylem Ion Loading and Its Regulation in Halophytes and Glycophytes},
journal = {Plant and Cell Physiology},
year = {2019},
volume = {61},
number = {2},
month = {November},
issn = {0032-0781},
pages = {403--415},
numpages = {12},
keywords = {salinity stress; non-selective cation channel; H2O2; potassium; sodium; stele;},
}

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%0 Journal Article
%T Comparing Kinetics of Xylem Ion Loading and Its Regulation in Halophytes and Glycophytes
%A Zarei, Mahvash
%A Sergey Shabala
%A Fanrong Zeng
%A Xiaohui Chen
%A Shuo Zhang
%A Azizi, Majid
%A مجید راحمی
%A Davarpanah, Sohrab
%A Min Yu
%A Lana Shabala
%J Plant and Cell Physiology
%@ 0032-0781
%D 2019

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