Acori Graminei Rhizoma (AGR), widely used in traditional herbal medicine, is composed of the roots of Acorus gramineus Soland. The family Acoraceae includes A. gramineus, A. calamus, and A. tatarinowii, among others. We compared genomic DNA sequences of AGR for polymorphisms. The sequences of the internal transcribed spacer (ITS) regions of nuclear ribosomal DNA, the rbcL region of chloroplast DNA from A. gramineus, A. calamus, and A. tatarinowii were compared. We designed primers specific to the ITS region of A. calamus and A. tatarinowii (A. cataF4/R4) and the internal primer Araceae Radix (IntAcoF2/R4). Random amplification of polymorphic DNA (RAPD) analysis showed a difference in A. calamus using the UBC 681 primer. A specific primer (Aca681-F/R) amplified 138 base pairs of A. calamus. The primers designed for this study (A. cataF4/R4, Aca681-F/R, and IntAcoF2/R2) can be used for multiplex PCR to distinguish the three species of Acorus. An allelic discrimination assay was conducted using commercially available AGR. We used sequence-characterized amplified region (SCAR) markers to confirm whether AGR purchased at a market was A. gramineus. Our study indicated the SCAR markers could be used as molecular evidence to distinguish Araceae Radix.
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