| Interplay between MAMP-triggered and SA-mediated defense responses. | |
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MedLine Citation:
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PMID: 18005228 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Plants respond to pathogen infection using an innate immune system with at least two distinct recognition mechanisms. One mechanism recognizes microbe-associated molecular patterns (MAMPs). The other is based on resistance (R) genes and specifically recognizes certain pathogen virulence factors, including those delivered through the type III secretion system (TTSS) of bacteria. Salicylic acid (SA)-mediated responses are an important part of the R gene-mediated defense. Substantial overlaps between MAMP-triggered and SA-mediated responses have been reported. However, interactions between MAMP-triggered and SA-mediated signaling mechanisms have not been well documented. Here we report intimate interactions between MAMP-triggered and SA-mediated signaling. We found that SA accumulated at a higher level 6 h after treatment with a MAMP, flg22 or inoculation with Pseudomonas syringae pv. tomato DC3000 (PstDC3000) hrcC mutant, which is deficient in TTSS function. Disruptions of SA signaling components, such as SID2 and PAD4, strongly affected MAMP-triggered responses monitored by expression profiling. We found two groups of genes that were induced by PstDC3000 hrcC in an SA-dependent manner. One group was SID2-dependent at all time points, whereas the other was SID2-independent at early time points and SID2-dependent at later time points. Thus, the expression of the latter genes responds to MAMPs through both SA-independent and SA-dependent signaling mechanisms. Strong resistance to PstDC3000 hrcC was dependent on SA signaling. These results indicate that the SA increase triggered by MAMPs is a major component of the MAMP-triggered signaling mechanism, explaining the overlapping spectra of MAMP-triggered and SA-mediated responses. |
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Authors:
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Kenichi Tsuda; Masanao Sato; Jane Glazebrook; Jerry D Cohen; Fumiaki Katagiri |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S. Date: 2007-11-14 |
Journal Detail:
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Title: The Plant journal : for cell and molecular biology Volume: 53 ISSN: 1365-313X ISO Abbreviation: Plant J. Publication Date: 2008 Mar |
Date Detail:
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Created Date: 2008-02-27 Completed Date: 2008-05-20 Revised Date: 2008-11-05 |
Medline Journal Info:
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Nlm Unique ID: 9207397 Medline TA: Plant J Country: England |
Other Details:
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Languages: eng Pagination: 763-75 Citation Subset: IM |
Affiliation:
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Department of Plant Biology, Microbial and Plant Genomics Institute, University of Minnesota, 1500 Gortner Avenue, St Paul, MN 55108, USA. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Arabidopsis
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genetics,
metabolism*,
microbiology* Gene Expression Profiling Gene Expression Regulation, Plant / physiology* Intramolecular Transferases / genetics, metabolism Plant Diseases / immunology Protein Array Analysis Pseudomonas syringae / physiology* RNA, Messenger / genetics, metabolism RNA, Plant / genetics, metabolism Salicylic Acid / metabolism* |
| Chemical | |
Reg. No./Substance:
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0/RNA, Messenger; 0/RNA, Plant; 69-72-7/Salicylic Acid; EC 5.4.-/Intramolecular Transferases; EC 5.4.4.2/isochorismate synthase |
| Comments/Corrections | |
Erratum In:
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Plant J. 2008 Sep;55(6):1061 |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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