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Glucosinolate Metabolites Required for an Arabidopsis Innate Immune Response
Nicole K. Clay,1,2,3Adewale M. Adio,4Carine Denoux,1,2,3Georg Jander,4Frederick M. Ausubel1,2,3*
The perception of pathogen or microbe-associated molecular patternmolecules by plants triggers a basal defense response analogousto animal innate immunity and is defined partly by the depositionof the glucan polymer callose at the cell wall at the site ofpathogen contact. Transcriptional and metabolic profiling inArabidopsis mutants, coupled with the monitoring of pathogen-triggeredcallose deposition, have identified major roles in pathogenresponse for the plant hormone ethylene and the secondary metabolite4-methoxy-indol-3-ylmethylglucosinolate. Two genes, PEN2 andPEN3, are also necessary for resistance to pathogens and arerequired for both callose deposition and glucosinolate activation,suggesting that the pathogen-triggered callose response is requiredfor resistance to microbial pathogens. Our study shows thatwell-studied plant metabolites, previously identified as importantin avoiding damage by herbivores, are also required as a componentof the plant defense response against microbial pathogens.
1 Department of Genetics, Harvard Medical School, Massachusetts General Hospital, Boston, MA 02114, USA. 2 Department of Molecular Biology, Massachusetts General Hospital, Boston, MA 02114, USA. 3 Center for Computational and Integrative Biology, Massachusetts General Hospital, Boston, MA 02114, USA. 4 Boyce Thompson Institute for Plant Research, Ithaca, NY 14853, USA.
* To whom correspondence should be addressed. E-mail: ausubel{at}molbio.mgh.harvard.edu
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