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New insights into the early biochemical activation of jasmonic acid biosynthesis in leaves.
MedLine Citation:
PMID:  20037473     Owner:  NLM     Status:  PubMed-not-MEDLINE    
Abstract/OtherAbstract:
In plants, herbivore attack elicits the rapid accumulation of jasmonic acid (JA) which results from the activation of constitutively expressed biosynthetic enzymes. The molecular mechanisms controlling the activation of JA biosynthesis remain largely unknown however new research has elucidated some of the early regulatory components involved in this process. Nicotiana attenuata plants, a wild tobacco species, responds to fatty acid amino acid conjuguates (FAC) elicitors in the oral secretion of its natural herbivore, Manduca sexta, by triggering specific defense and tolerance responses against it; all of the defense responses known to date require the amplification of the wound-induced JA increase. We recently demonstrated that this FAC-elicited JA burst requires an increased flux of free linolenic acid (18:3) likely originating from the activation of a plastidial glycerolipase (GLA1) which is activated by an abundant FAC found in insect oral secretions, N-linolenoyl-glutamate (18:3-Glu). The lack of accumulation of free 18:3 after elicitation suggests a tight physical association between GLA1 and LOX3 in N. attenuata leaves. In addition, the salicylate-induced protein kinase (SIPK) and the nonexpressor of PR-1 (NPR1) participate in this activation mechanism that controls the supply of 18:3. In contrast, the wound-induced protein kinase (WIPK) does not but instead regulates the conversion of 13(S)-hydroperoxy-18:3 into 12-oxo-phytodienoic acid (OPDA). These results open new perspectives on the complex network of signals and regulatory components inducing the JA biosynthetic pathway.
Authors:
Gustavo Bonaventure; Ian T Baldwin
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Publication Detail:
Type:  Comment; Journal Article     Date:  2010-03-19
Journal Detail:
Title:  Plant signaling & behavior     Volume:  5     ISSN:  1559-2324     ISO Abbreviation:  Plant Signal Behav     Publication Date:  2010 Mar 
Date Detail:
Created Date:  2010-05-20     Completed Date:  2010-07-26     Revised Date:  2010-09-02    
Medline Journal Info:
Nlm Unique ID:  101291431     Medline TA:  Plant Signal Behav     Country:  United States    
Other Details:
Languages:  eng     Pagination:  287-9     Citation Subset:  -    
Affiliation:
Max Planck Institute for Chemical Ecology, Department of Molecular Ecology, Jena, Germany. gbonaventure@ice.mpg.de
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Comment On:
Plant Physiol. 2010 Jan;152(1):96-106   [PMID:  19897603 ]

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