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  The lipopolysaccharide of Sinorhizobium meliloti suppresses defense-associated gene expression in cell cultures of the host plant Medicago truncatula

Tellstroem, V., Usadel, B., Thimm, O., Stitt, M., Kuester, H., & Niehaus, K. (2007). The lipopolysaccharide of Sinorhizobium meliloti suppresses defense-associated gene expression in cell cultures of the host plant Medicago truncatula. Plant Physiology, 143(2), 825-837. doi:10.1104/pp.106.090985.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0014-283E-1 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0014-283F-0
Genre: Journal Article

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 Creators:
Tellstroem, V.1, Author
Usadel, B.2, Author              
Thimm, O.2, Author              
Stitt, M.2, Author              
Kuester, H.1, Author
Niehaus, K.1, Author
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1External Organizations, ou_persistent22              
2System Regulation, Department Stitt, Max Planck Institute of Molecular Plant Physiology, Max Planck Society, ou_1753327              

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Free keywords: infection thread development phenylalanine ammonia-lyase oxidative burst reaction nicotiana-tabacum cells pea plasma-membranes xanthomonas-campestris suspension cultures innate immunity early events beta-glucan
 Abstract: In the establishment of symbiosis between Medicago truncatula and the nitrogen-fixing bacterium Sinorhizobium meliloti, the lipopolysaccharide (LPS) of the microsymbiont plays an important role as a signal molecule. It has been shown in cell cultures that the LPS is able to suppress an elicitor-induced oxidative burst. To investigate the effect of S. meliloti LPS on defense-associated gene expression, a microarray experiment was performed. For evaluation of the M. truncatula microarray datasets, the software tool MapMan, which was initially developed for the visualization of Arabidopsis (Arabidopsis thaliana) datasets, was adapted by assigning Medicago genes to the ontology originally created for Arabidopsis. This allowed functional visualization of gene expression of M. truncatula suspension-cultured cells treated with invertase as an elicitor. A gene expression pattern characteristic of a defense response was observed. Concomitant treatment of M. truncatula suspension-cultured cells with invertase and S. meliloti LPS leads to a lower level of induction of defense-associated genes compared to induction rates in cells treated with invertase alone. This suppression of defense-associated transcriptional rearrangement affects genes induced as well as repressed by elicitation and acts on transcripts connected to virtually all kinds of cellular processes. This indicates that LPS of the symbiont not only suppresses fast defense responses as the oxidative burst, but also exerts long-term influences, including transcriptional adjustment to pathogen attack. These data indicate a role for LPS during infection of the plant by its symbiotic partner.

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Language(s): eng - English
 Dates: 2007-01-162007
 Publication Status: Published in print
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 Identifiers: ISI: ISI:000244032400025
DOI: 10.1104/pp.106.090985
ISSN: 0032-0889 (Print) 0032-0889 (Linking)
URI: ://000244032400025 http://www.jstor.org/stable/pdfplus/40065436.pdf?acceptTC=true
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Title: Plant Physiology
Source Genre: Journal
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Pages: - Volume / Issue: 143 (2) Sequence Number: - Start / End Page: 825 - 837 Identifier: -