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H2O2 and cytosolic Ca2+ signals triggered by the PM H-coupled transport system mediate K+/Na+ homeostasis in NaCl-stressed Populus euphratica cells.

Identifieur interne : 003234 ( Main/Exploration ); précédent : 003233; suivant : 003235

H2O2 and cytosolic Ca2+ signals triggered by the PM H-coupled transport system mediate K+/Na+ homeostasis in NaCl-stressed Populus euphratica cells.

Auteurs : Jian Sun [République populaire de Chine] ; Mei-Juan Wang ; Ming-Quan Ding ; Shu-Rong Deng ; Mei-Qin Liu ; Cun-Fu Lu ; Xiao-Yang Zhou ; Xin Shen ; Xiao-Jiang Zheng ; Zeng-Kai Zhang ; Jin Song ; Zan-Min Hu ; Yue Xu ; Shao-Liang Chen

Source :

RBID : pubmed:20082667

Descripteurs français

English descriptors

Abstract

Using confocal microscopy, X-ray microanalysis and the scanning ion-selective electrode technique, we investigated the signalling of H(2)O(2), cytosolic Ca(2+) ([Ca(2+)](cyt)) and the PM H(+)-coupled transport system in K(+)/Na(+) homeostasis control in NaCl-stressed calluses of Populus euphratica. An obvious Na(+)/H(+) antiport was seen in salinized cells; however, NaCl stress caused a net K(+) efflux, because of the salt-induced membrane depolarization. H(2)O(2) levels, regulated upwards by salinity, contributed to ionic homeostasis, because H(2)O(2) restrictions by DPI or DMTU caused enhanced K(+) efflux and decreased Na(+)/H(+) antiport activity. NaCl induced a net Ca(2+) influx and a subsequent rise of [Ca(2+)](cyt), which is involved in H(2)O(2)-mediated K(+)/Na(+) homeostasis in salinized P. euphratica cells. When callus cells were pretreated with inhibitors of the Na(+)/H(+) antiport system, the NaCl-induced elevation of H(2)O(2) and [Ca(2+)](cyt) was correspondingly restricted, leading to a greater K(+) efflux and a more pronounced reduction in Na(+)/H(+) antiport activity. Results suggest that the PM H(+)-coupled transport system mediates H(+) translocation and triggers the stress signalling of H(2)O(2) and Ca(2+), which results in a K(+)/Na(+) homeostasis via mediations of K(+) channels and the Na(+)/H(+) antiport system in the PM of NaCl-stressed cells. Accordingly, a salt stress signalling pathway of P. euphratica cells is proposed.

DOI: 10.1111/j.1365-3040.2010.02118.x
PubMed: 20082667


Affiliations:


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Le document en format XML

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<div type="abstract" xml:lang="en">Using confocal microscopy, X-ray microanalysis and the scanning ion-selective electrode technique, we investigated the signalling of H(2)O(2), cytosolic Ca(2+) ([Ca(2+)](cyt)) and the PM H(+)-coupled transport system in K(+)/Na(+) homeostasis control in NaCl-stressed calluses of Populus euphratica. An obvious Na(+)/H(+) antiport was seen in salinized cells; however, NaCl stress caused a net K(+) efflux, because of the salt-induced membrane depolarization. H(2)O(2) levels, regulated upwards by salinity, contributed to ionic homeostasis, because H(2)O(2) restrictions by DPI or DMTU caused enhanced K(+) efflux and decreased Na(+)/H(+) antiport activity. NaCl induced a net Ca(2+) influx and a subsequent rise of [Ca(2+)](cyt), which is involved in H(2)O(2)-mediated K(+)/Na(+) homeostasis in salinized P. euphratica cells. When callus cells were pretreated with inhibitors of the Na(+)/H(+) antiport system, the NaCl-induced elevation of H(2)O(2) and [Ca(2+)](cyt) was correspondingly restricted, leading to a greater K(+) efflux and a more pronounced reduction in Na(+)/H(+) antiport activity. Results suggest that the PM H(+)-coupled transport system mediates H(+) translocation and triggers the stress signalling of H(2)O(2) and Ca(2+), which results in a K(+)/Na(+) homeostasis via mediations of K(+) channels and the Na(+)/H(+) antiport system in the PM of NaCl-stressed cells. Accordingly, a salt stress signalling pathway of P. euphratica cells is proposed.</div>
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<AbstractText>Using confocal microscopy, X-ray microanalysis and the scanning ion-selective electrode technique, we investigated the signalling of H(2)O(2), cytosolic Ca(2+) ([Ca(2+)](cyt)) and the PM H(+)-coupled transport system in K(+)/Na(+) homeostasis control in NaCl-stressed calluses of Populus euphratica. An obvious Na(+)/H(+) antiport was seen in salinized cells; however, NaCl stress caused a net K(+) efflux, because of the salt-induced membrane depolarization. H(2)O(2) levels, regulated upwards by salinity, contributed to ionic homeostasis, because H(2)O(2) restrictions by DPI or DMTU caused enhanced K(+) efflux and decreased Na(+)/H(+) antiport activity. NaCl induced a net Ca(2+) influx and a subsequent rise of [Ca(2+)](cyt), which is involved in H(2)O(2)-mediated K(+)/Na(+) homeostasis in salinized P. euphratica cells. When callus cells were pretreated with inhibitors of the Na(+)/H(+) antiport system, the NaCl-induced elevation of H(2)O(2) and [Ca(2+)](cyt) was correspondingly restricted, leading to a greater K(+) efflux and a more pronounced reduction in Na(+)/H(+) antiport activity. Results suggest that the PM H(+)-coupled transport system mediates H(+) translocation and triggers the stress signalling of H(2)O(2) and Ca(2+), which results in a K(+)/Na(+) homeostasis via mediations of K(+) channels and the Na(+)/H(+) antiport system in the PM of NaCl-stressed cells. Accordingly, a salt stress signalling pathway of P. euphratica cells is proposed.</AbstractText>
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<name sortKey="Ding, Ming Quan" sort="Ding, Ming Quan" uniqKey="Ding M" first="Ming-Quan" last="Ding">Ming-Quan Ding</name>
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<name sortKey="Song, Jin" sort="Song, Jin" uniqKey="Song J" first="Jin" last="Song">Jin Song</name>
<name sortKey="Wang, Mei Juan" sort="Wang, Mei Juan" uniqKey="Wang M" first="Mei-Juan" last="Wang">Mei-Juan Wang</name>
<name sortKey="Xu, Yue" sort="Xu, Yue" uniqKey="Xu Y" first="Yue" last="Xu">Yue Xu</name>
<name sortKey="Zhang, Zeng Kai" sort="Zhang, Zeng Kai" uniqKey="Zhang Z" first="Zeng-Kai" last="Zhang">Zeng-Kai Zhang</name>
<name sortKey="Zheng, Xiao Jiang" sort="Zheng, Xiao Jiang" uniqKey="Zheng X" first="Xiao-Jiang" last="Zheng">Xiao-Jiang Zheng</name>
<name sortKey="Zhou, Xiao Yang" sort="Zhou, Xiao Yang" uniqKey="Zhou X" first="Xiao-Yang" last="Zhou">Xiao-Yang Zhou</name>
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<name sortKey="Sun, Jian" sort="Sun, Jian" uniqKey="Sun J" first="Jian" last="Sun">Jian Sun</name>
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