Document Detail

Superoxide production induced by short-term exposure of barley roots to cadmium, auxin, alloxan and sodium dodecyl sulfate.
MedLine Citation:
PMID:  22890373     Owner:  NLM     Status:  MEDLINE    
Abiotic stress-induced superoxide generation depending on its localization, level, duration and presumably also on the action of other signals may lead to different stress responses. The purpose of this study was to analyze the alterations in superoxide generation and morphogenesis following short-term Cd, IAA and alloxan treatments, during stress and recovery period in barley root tips. At low Cd concentration the transient accumulation of superoxide in the epidermal cells was accompanied by root growth inhibition and radial expansion of cortical cells in the elongation zone of root tips. These morphological changes were very similar to the externally applied IAA-induced responses. However, the role of superoxide generated in the epidermal cells by low concentration of Cd and IAA is probably alone not sufficient for the induction of these processes. SDS as an activator of NOX activity caused a strong accumulation of superoxide in the epidermal cells along the whole root apex but without any changes in root morphology and growth. On the other hand, higher Cd concentrations as well as alloxan stimulated the generation of superoxide in the cortical tissue of the elongation zone of root tip, which was accompanied by the induction of cell death. Our results suggest that enhanced superoxide generation, depending on its localization, level, duration and presumably also on the action of other signals, may lead to altered root morphology (15 μM Cd or IAA), root growth inhibition (alloxan), transient root growth cessation (30 μM Cd) or to the death of cells/root at higher (60 μM) Cd concentrations.
L'ubica Liptáková; Beáta Bočová; Jana Huttová; Igor Mistrík; Ladislav Tamás
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2012-08-14
Journal Detail:
Title:  Plant cell reports     Volume:  31     ISSN:  1432-203X     ISO Abbreviation:  Plant Cell Rep.     Publication Date:  2012 Dec 
Date Detail:
Created Date:  2012-11-09     Completed Date:  2013-04-17     Revised Date:  2013-07-15    
Medline Journal Info:
Nlm Unique ID:  9880970     Medline TA:  Plant Cell Rep     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  2189-97     Citation Subset:  IM    
Institute of Botany, Slovak Academy of Sciences, Dúbravská cesta 9, 84523 Bratislava, Slovak Republic.
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MeSH Terms
Alloxan / pharmacology*
Cadmium / pharmacology*
Cell Death
Enzyme Activation
Hordeum / drug effects*,  growth & development,  metabolism
Indoleacetic Acids / pharmacology*
NADPH Oxidase / metabolism
Plant Cells / drug effects,  metabolism
Plant Epidermis / drug effects,  metabolism
Plant Roots / drug effects,  growth & development,  metabolism*
Sodium Dodecyl Sulfate / pharmacology*
Stress, Physiological
Superoxides / metabolism*
Time Factors
Reg. No./Substance:
0/Indoleacetic Acids; 11062-77-4/Superoxides; 151-21-3/Sodium Dodecyl Sulfate; 50-71-5/Alloxan; 7440-43-9/Cadmium; EC Oxidase

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