We have isolated a genomic clone corresponding to a caffeic acid O-methyltransferase (COMT) from barley (Hordeum vulgare L.) using a cDNA for a previously described jasmonate-regulated mRNA showing homology to COMT. Primer extension was used to characterize the 5' end of the mRNA while the 3' end, intron/exon structure and other features of the sequence were deduced by comparison to the cDNA sequence and/or conserved motifs. The gene is mapped to chromosome five and is absent in the barley cultivar Morex. Southern and northern analyses suggest that no differences in genomic structure and jasmonate inducibility exist between the barley cultivar Salome (source of the cDNA clone) and Igri (source of the genomic clone). This genomic clone is thus suitable for promoter studies with respect to jasmonate induction.
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