Document Detail

Aspergillus infection inhibits the expression of peanut 13S-HPODE-forming seed lipoxygenases.
MedLine Citation:
PMID:  16255247     Owner:  NLM     Status:  MEDLINE    
Oxylipins recently have been implicated as signaling molecules for cross-kingdom communication in plant-pathogen interactions. Linoleic acid and its two plant lipoxygenase (LOX) oxylipin products 9- and 13-hydroperoxy fatty acids (9S- and 13S-HPODE) have been shown to have a significant effect on differentiation processes in the mycotoxigenic seed pathogens Aspergillus spp. Whereas both fatty acids promote sporulation, 9S-HPODE stimulates and 13S-HPODE inhibits mycotoxin production. Additionally, Aspergillus flavus infection of seed promotes linoleate 9-LOX expression and 9S-HPODE accumulation. Here, we describe the characterization of two peanut seed lipoxygenase alleles (PnLOX2 and PnLOX3) highly expressed in mature seed. PnLOX2 and PnLOX3 both are 13S-HPODE producers (linoleate 13-LOX) and, in contrast to previously characterized 9-LOX or mixed function LOX genes, are repressed between 5-fold and 250-fold over the course of A. flavus infection. The results of these studies suggest that 9S-HPODE and 13S-HPODE molecules act as putative susceptibility and resistance factors respectively, in Aspergillus seed-aflatoxin interactions.
Dimitrios I Tsitsigiannis; Susan Kunze; David K Willis; Ivo Feussner; Nancy P Keller
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Molecular plant-microbe interactions : MPMI     Volume:  18     ISSN:  0894-0282     ISO Abbreviation:  Mol. Plant Microbe Interact.     Publication Date:  2005 Oct 
Date Detail:
Created Date:  2005-10-31     Completed Date:  2006-01-23     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  9107902     Medline TA:  Mol Plant Microbe Interact     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1081-9     Citation Subset:  IM    
Department of Plant Pathology, University of Wisconsin-Madison, Madison 53706, USA.
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MeSH Terms
Aspergillus / physiology*
Base Sequence
DNA Primers
Linoleic Acids / biosynthesis*
Lipid Peroxides / biosynthesis*
Lipoxygenase / drug effects*,  genetics
Plants / embryology,  enzymology*
Polymorphism, Restriction Fragment Length
Reverse Transcriptase Polymerase Chain Reaction
Seeds / enzymology*
Reg. No./Substance:
0/DNA Primers; 0/Linoleic Acids; 0/Lipid Peroxides; 23017-93-8/13-hydroperoxy-9,11-octadecadienoic acid; EC

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