There are numerous chemotypes of Cinnamomum osmophloeum in Taiwan, each of which generates an identical profi le of volatile secondary metabolites. Cinnamaldehyde is the major constituent of C. osmophloeum and its quantity varies between strains. The cinnamaldehyde-type C. osmophloeum contains abundance of cinnamaldehyde, which is an economically important product, which can be gained from the leaf essential oil. Here, the genes involved in cinnamaldehyde biosynthesis have been investigated and four candidate genes, phenylalanine ammonia-lyase ( Co PAL), 4-coumarate: coenzyme A ligase 1 and 4 ( Co 4CL1 and Co 4CL4), and cinnamoyl-CoA reductase ( Co CCR), were selected as potential molecular marker typical for the cinnamaldehyde chemotype. Cinnamaldehyde was increased in Co 4CL1, Co 4CL4, and Co CCR transgenic plants. The results showed that the cinnamaldehyde and non-cinnamaldehyde chemotypes can be distinguished by a single nucleotide polymorphism in the substrate binding pocket region of Co 4CL4, at residue 378 of Co 4CL4. This polymorphism could be used as a potential molecular marker for identifi cation of strains of C. osmophloeum , which belong to high-yield cinnamaldehyde producer type. In addition, this fi nding might provide a suitable strategy for biosynthesis of bioactive metabolites in the future.
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