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231224s2014 xx |||||o 00| ||eng c |
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|a 10.1093/jxb/eru251
|2 doi
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|a eng
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|a Bazihizina, Nadia
|e verfasserin
|4 aut
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|a Zn2+ -induced changes at the root level account for the increased tolerance of acclimated tobacco plants
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|c 2014
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
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|2 rdamedia
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|a ƒa Online-Ressource
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|a Date Completed 28.05.2015
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|a Date Revised 21.03.2024
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|a published: Print-Electronic
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|a Citation Status MEDLINE
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|a © The Author 2014. Published by Oxford University Press on behalf of the Society for Experimental Biology.
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|a Evidence suggests that heavy-metal tolerance can be induced in plants following pre-treatment with non-toxic metal concentrations, but the results are still controversial. In the present study, tobacco plants were exposed to increasing Zn2+ concentrations (up to 250 and/or 500 μM ZnSO4) with or without a 1-week acclimation period with 30 μM ZnSO4. Elevated Zn2+ was highly toxic for plants, and after 3 weeks of treatments there was a marked (≥50%) decline in plant growth in non-acclimated plants. Plant acclimation, on the other hand, increased plant dry mass and leaf area up to 1.6-fold compared with non-acclimated ones. In non-acclimated plants, the addition of 250 μM ZnSO4 led to transient membrane depolarization and stomatal closure within 24h from the addition of the stress; by contrast, the acclimation process was associated with an improved stomatal regulation and a superior ability to maintain a negative root membrane potential, with values on average 37% more negative compared with non-acclimated plants. The different response at the plasma-membrane level between acclimated and non-acclimated plants was associated with an enhanced vacuolar Zn2+ sequestration and up to 2-fold higher expression of the tobacco orthologue of the Arabidopsis thaliana MTP1 gene. Thus, the acclimation process elicited specific detoxification mechanisms in roots that enhanced Zn2+ compartmentalization in vacuoles, thereby improving root membrane functionality and stomatal regulation in leaves following elevated Zn2+ stress
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|a Journal Article
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|a Research Support, Non-U.S. Gov't
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|a Acclimation
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|a Nicotiana tabacum
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|a heavy-metal toxicity
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|a membrane potential
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|a stomatal conductance
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|a Taiti, Cosimo
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|a Marti, Lucia
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|a Rodrigo-Moreno, Ana
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|a Spinelli, Francesco
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|a Mancuso, Stefano
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|i Enthalten in
|t Journal of experimental botany
|d 1985
|g 65(2014), 17 vom: 15. Sept., Seite 4931-42
|w (DE-627)NLM098182706
|x 1460-2431
|7 nnns
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|g volume:65
|g year:2014
|g number:17
|g day:15
|g month:09
|g pages:4931-42
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|u http://dx.doi.org/10.1093/jxb/eru251
|3 Volltext
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