Résumé
OBJECTIVE: To identify Polygonum chinensis and its adulterants by ITS2 sequences. METHODS: Total genomic DNA of P. chinensis was extracted using the plant genomic DNA kit. The internal transcribed spacer 2(ITS2) regions were amplified. The variable site of ITS2 regions were analysed through MEGA 6.0 software. The intra-versus inter-specific genetic distances of the ITS2 regions was calculated based on the kimura 2-parameter(K2P) model. Neighbor-Joining phylogenetic trees were constructed using MEGA6.0. RESULTS: The intraspecific variation of P. chinensis was small. However, the interspecific variation of P. chinensis and its adulterants was small distinct. The secondary structure of ITS2 of P. chinensis and its adulterants has significant difference. NJ trees can identify P. chinensis and its adulterants. CONCLUSION: ITS2 Regions can be used to authenticate P. chinensis and its adulterants which provide new METHODS for the identification of P. chinensis. The standard DNA barcodes of P. chinensis are establishment which would lay the foundation of identification and safety clinical drug application of P. chinensis.