Inhibition of Wound-Induced Accumulation of Allene Oxide Synthase Transcripts in Flax Leaves by Aspirin and Salicylic Acid

DOI PDF 被引用文献3件
  • Karsten Harms
    Max-Planck-Institut for Molecular Plant Physiology, Karl-Liebknecht-Strasse 25, Haus 20, D-14476 Golm, Germany (K.H.)
  • Ingrid Ramirez
    Departamento de Biologı́a, Facultad de Quı́mica y Biologı́a, Universidad de Santiago de Chile, Casilla 40, Correo 33, Santiago, Chile (I.R., H.P.-C.)
  • Hugo Peña-Cortés
    Departamento de Biologı́a, Facultad de Quı́mica y Biologı́a, Universidad de Santiago de Chile, Casilla 40, Correo 33, Santiago, Chile (I.R., H.P.-C.)

抄録

<jats:title>Abstract</jats:title> <jats:p>Allene oxide synthase (AOS) mediates the conversion of lipoxygenase-derived fatty acid hydroperoxides to unstable allene epoxides, which supply the precursors for the synthesis of the phytohormone jasmonic acid (JA). In this study the characterization of AOS gene expression in flax (Linum usitatissimum) is reported. AOS was constitutively expressed in different organs of flax plants. Additionally, AOS gene expression was enhanced after mechanical wounding in both the directly damaged leaves and in the systemic tissue located distal to the treated leaves. This wound-induced accumulation of AOS required the de novo biosynthesis of other unknown proteins involved in the signaling pathway modulating wound-induced AOS gene expression. Furthermore, the wound-induced AOS mRNA accumulation was correlated with the increase in the levels of JA. Both JA and its precursor, 12-oxo-phytodienoic acid, activated AOS gene expression in a dose-dependent manner. Thus, JA could activate its own biosynthetic pathway in flax leaves. Moreover, neither salicylic acid (SA) nor aspirin influenced AOS enzymatic activity. It is interesting that pretreatment with SA or aspirin inhibited wound-induced accumulation of AOS transcripts. These results suggest that a potent inhibition of JA biosynthetic capacity in leaves can be affected by SA or aspirin at the level of AOS gene expression.</jats:p>

収録刊行物

  • Plant Physiology

    Plant Physiology 118 (3), 1057-1065, 1998-11-01

    Oxford University Press (OUP)

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