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Methyl Jasmonate Induces Lauric Acid omega -Hydroxylase Activity and Accumulation of CYP94A1 Transcripts but Does Not Affect Epoxide Hydrolase Activities in Vicia sativa Seedlings1

Franck Pinot*, Irène Benveniste, Jean-Pierre Salaün, and Francis Durst

Institut de Biologie Moléculaire des Plantes-Centre National de la Recherche Scientifique, Département d'Enzymologie Cellulaire et Moléculaire, 28 Rue Goethe, F-67083 Strasbourg cedex, France

Treatment of etiolated Vicia sativa seedlings by the plant hormone methyl jasmonate (MetJA) led to an increase of cytochrome P450 content. Seedlings that were treated for 48 h in a 1 mM solution of MetJA stimulated omega -hydroxylation of 12:0 (lauric acid) 14-fold compared with the control (153 versus 11 pmol min-1 mg-1 protein, respectively). Induction was dose dependent. The increase of activity (2.7-fold) was already detectable after 3 h of treatment. Activity increased as a function of time and reached a steady level after 24 h. Northern-blot analysis revealed that the transcripts coding for CYP94A1, a fatty acid omega -hydroxylase, had already accumulated after 1 h of exposure to MetJA and was maximal between 3 and 6 h. Under the same conditions, a study of the enzymatic hydrolysis of 9,10-epoxystearic acid showed that both microsomal and soluble epoxide hydrolase activities were not affected by MetJA treatment.

1   This work was partly supported by grants from the Ministère de la Recherche et de la Technologie (Génétique et Environnement, no. ACC-SV3) and from the Centre National de la Recherche Scientifique (Program Environment, no. GDR 1105).
*   Corresponding author; e-mail franck.pinot{at}bota-ulp.ustrasbg.fr; fax 33-3-88-35-84-84.

Plant Physiol. (1998) 118: 1481-1486
Copyright Clearance Center:   0032-0889/98/118//06
© 1998 American Society of Plant Physiologists




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