Document Detail


Dynamics and localization of H2O2 production in elicited plant cells.
MedLine Citation:
PMID:  17351735     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
H(2)O(2) produced in plant cells plays a dual role. In addition to its antimicrobial effect, it also acts as a secondary messenger initiating and modulating responses of plants exposed to unfavorable external signals. A suspension culture of Rubia tinctorum cells challenged with elicitors was used as a model system to investigate H(2)O(2) formation. Cellular H(2)O(2) was measured by a modified titanium(IV) method, while that in the medium was detected with scopoletin fluorescence. Localization of H(2)O(2) production at the ultrastructural level was carried out by the CeCl(3) reaction. A fungal elicitor induced H(2)O(2) production with transient maxima, the first of which appeared 4 min after treatment. Three subsequent maxima appeared in the cells up to 48 h after treatment. Exposure of cells to exogenous jasmonic acid and salicylic acid also changed the H(2)O(2) concentration maxima over 48 h; however, their timing was slightly shifted. Fungal-elicitor, jasmonic acid, and salicylic acid treatments had different effects on the H(2)O(2) concentration in the medium. Ultrastructural investigations revealed that electron-dense precipitates were present at the plasmalemma and in some nearby vesicular cytoplasmic structures 30 min after treatment. Later samples showed cytochemical-precipitate accumulation in the cell walls. These deposits appeared to be local and independent of the direction of the external signal. We could not detect the presence of H(2)O(2) in peroxisomes, mitochondria, plastids, or the central vacuolar space. Electron energy loss spectroscopy investigations distinguished between the cerium-containing precipitates and other electrondense particles, thereby proving that H(2)O(2) generation occurs locally.
Authors:
K Bóka; N Orbán; Z Kristóf
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Publication Detail:
Type:  Journal Article     Date:  2007-02-19
Journal Detail:
Title:  Protoplasma     Volume:  230     ISSN:  0033-183X     ISO Abbreviation:  Protoplasma     Publication Date:  2007  
Date Detail:
Created Date:  2007-03-12     Completed Date:  2007-05-18     Revised Date:  2007-11-15    
Medline Journal Info:
Nlm Unique ID:  9806853     Medline TA:  Protoplasma     Country:  Austria    
Other Details:
Languages:  eng     Pagination:  89-97     Citation Subset:  IM    
Affiliation:
Department of Plant Anatomy, Eötvös University, Budapest, Hungary. bokak@ludens.elte.hu
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MeSH Terms
Descriptor/Qualifier:
Cell Survival / drug effects
Cells, Cultured
Cyclopentanes / pharmacology*
Hydrogen Peroxide / metabolism*
Microscopy, Electron
Oxylipins
Rubia / drug effects*,  metabolism*,  ultrastructure
Salicylic Acid / pharmacology*
Spectroscopy, Electron Energy-Loss
Chemical
Reg. No./Substance:
0/Cyclopentanes; 0/Oxylipins; 6894-38-8/jasmonic acid; 69-72-7/Salicylic Acid; 7722-84-1/Hydrogen Peroxide

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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