Abstract
Plant cytochrome P450 monooxygenases (P450s) mediate a wide range of oxidative reactions involved in the biosynthesis of phenylpropanoids, terpenes, lipids, and alkaloids. We isolated a cDNA clone for cinnamate-4-hydroxylase (C4H) from a Japonica type rice(Oryza sativa L. cv. llpumbyeo). This C4H has a deduced amino acid sequence that is 85% identical tothat ofSorghum bicolor. Our phylogenetic analysis also showed that theOsC4HL gene is closely related toC4H fromS. bicolor. A putative genomic DNA sequence corresponding toOsC4HL contained cis-elements (boxes P, A, L, and TCA motifs), AT-rich elements, and wound-response elements that control gene expression in its promoter region.OsC4HL expression was detected in all the tissue types, with the highest level being measured in the roots. It was also apparently up-regulated by wounding stress. These data suggest that theOsC4HL gene isC4H member in theCYP73 subfamily.
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