RESUMEN
Objective: To study the genetic diversity and genetic structure of Paris genus in Shaanxi Province. Methods: Start Codon Targeted Polymorphism (SCoT) molecular markers were performed on 48 samples from six taxas of Paris genus in Shaanxi. Genetic distance was calculated by POPGENE 3.2 software, and cluster analysis was generated by NTSYS 2.10 software based on unweighted mean distance method (UPGMA) method. Results: A total of 152 bands were produced by 12 primers, among which 135 bands were polymorphic bands, and the percentage of polymorphic bands was 88.82%. The average value of Nei’s genetic diversity index (H) was 0.267 4, Shannon’s information index (I) was 0.404 1, genetic differentiation coefficient (Gst) was 0.517 9, and the gene flow (Nm) was 0.465 4. Six taxas were ranked by genetic diversity: Paris polyphylla > Paris polyphylla var. latifolia > Paris fargesii var. petiolata > Paris polyphylla var. stenophylla > Paris polyphylla var. yunnanensis > Paris verticillata. Cluster analysis distinguished others from Paris verticillata; When the genetic distance was certain, six taxas of the genus were completely separated. Conclusion: SCoT molecular markers can obtain polymorphic and clear band amplification map, which indicates that the technology can be used for molecular identification and genetic relationship of major taxas in Paris genus in Shaanxi Province, providing a scientific basis for screening alternative resource types close to the Pharmacopoeia collection and guiding the rational use of local species.