Identification of Zanthoxylum armatum and Its Closely Related Species Based on ITS2 Sequence
Abstract:Objective:To explore the feasibility of using DNA barcoding technology to identify Zanthoxylum armatum and its closely related species, the internal transcribed spacer 2(ITS2)barcoding sequences were analyzed. Methods:By DNA extraction, amplification and sequencing of experimental samples, and downloading the ITS2 sequences from GenBank, a total of 43 ITS2 sequences of Z.armatum and its closely related species were obtained. Identification was conducted based on BLAST method, Neighbor-Joining(NJ) phylogenetic tree method, Kimura 2-parameter(K2P) genetic distance method, and secondary structure of ITS2 sequence. Results:The results of BLAST were consistent with those of morphological identification. The average intraspecific K2P genetic distance of Z. armatum was smaller than the average interspecific K2P genetic distance between it and Z.bungeanum, and Z.schinifolium, and Z.simulans. Both NJ phylogenetic tree and ITS2 secondary structure can distinguish Z.armatum and its closely related species intuitively. Conclusion:The ITS2 barcoding method can be used to identify Z.armatum and its closely related species.