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The role of oxylipins in plant defence response against microbial pathogens: searching for the acyl hydrolases responsible for the synthesis of oxylipins ; Des dérivés d'acides gras dans la résistance des plantes aux attaques microbiennes: à la recherche d'acyle hydrolases impliquées dans la synthèse des oxylipines

Heitz , T. ) ; Dhondt , S. ; Gouzerh , G. ; Geoffroy , P. ; Legrand , M.

Oléagineux Corps Gras Lipides, 2002, Vol.(1), pp.37-42 [Rivista Peer Reviewed]

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  • Titolo:
    The role of oxylipins in plant defence response against microbial pathogens: searching for the acyl hydrolases responsible for the synthesis of oxylipins ; Des dérivés d'acides gras dans la résistance des plantes aux attaques microbiennes: à la recherche d'acyle hydrolases impliquées dans la synthèse des oxylipines
  • Autore: Heitz , T. ) ; Dhondt , S. ; Gouzerh , G. ; Geoffroy , P. ; Legrand , M.
  • Descrizione: Recent evidence suggested that oxidized lipid-derived molecules called oxylipins play important roles in inducible plant defence responses against microbial pathogens, as signals involved in the induction of sets of defence gene, as factors promoting host cell death, or by directly deterring parasite multiplication. The synthesis of oxylipins was thought to be dependent on the release of free fatty acids from membrane lipids, but the enzyme(s) responsible for such activity is (are) unkown. First was showed that in tobacco leaves reacting hypersensitively to tobacco mosaic virus, a strong increase in soluble PLA2 activity is induced before the accumulation of jasmonates, which are well characterized defence modulators. The protein bearing most of the enzymatic activity was isolated and identified as related to the potatin type of acyl hydrolases. Three cDNAs, that were called NtPat, were isolated and recombinant NtPAT1 and NtPAT3 proteins produced in Escherichia coli were shown to display high PLA1, PLA2, and galactolipase activity. A detailed study of the expression profile of NtPat-encoded PLA2 activity revealed that this response is specifically induced upon microbial attack, and is not a general response to stress. In some cases, the induction of NtPat genes could be correlated with the synthesis of jasmonates. Although NtPAT proteins are probably not located in the chloroplasts, the cellular site of the early jasmonate biosynthetic steps, they may contribute to a general breakdown of lipids occurring during pathogen-induced cell death and therefore provide fatty acid precursors for the synthesis of some oxylipins ; Summary (En) ; 4 graph., 37 réf.
  • Fa parte di: Oléagineux Corps Gras Lipides, 2002, Vol.(1), pp.37-42
  • Soggetti: Crops ; Plant Diseases ; Defence Mechanisms ; Jasmonic Acid ; Esterases ; Fatty Acids ; Host Pathogen Relations ; Nicotiana Tabacum ; Enzyme Activity ; Plante De Culture ; Maladie Des Plantes ; Mecanisme De Defense ; Acide Jasmonique ; Esterase ; Acide Gras ; Relation Hote Pathogene ; Nicotiana Tabacum ; Activite Enzymatique ; Cultivos ; Enfermedades De Las Plantas ; Mecanismos De Defensa ; Acido Jasmonico ; Esterasas ; Acidos Grasos ; Relaciones Huesped Patogeno ; Nicotiana Tabacum ; Actividad Enzimatica
  • Lingua: Francese
  • Identificativo: ISSN: 1258-8210
  • Fonte: AGRIS (Food and Agriculture Organization of the United Nations)

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