Your browser doesn't support javascript.
loading
Identification and quality evaluation of germplasm resources of commercial Scutellaria baicalensis based on DNA barcode and HPLC / 中国中药杂志
Zhongguo Zhong Yao Za Zhi ; (24): 1814-1823, 2022.
Article de Zh | WPRIM | ID: wpr-928177
Bibliothèque responsable: WPRO
ABSTRACT
Scutellaria baicalensis is a commonly used Chinese medicinal herb. In this study, we identified the germplasm resources of commercial S. baicalensis samples based on trnH-psbA, petA-psbJ, and ycf4-cemA sequences according to the available chloroplast genome sequencing results, and measured the content of baicalin by HPLC. Through the above means we determined the best DNA barcode that can be used to detect the germplasm resources and evaluate the quality of commercial S. baicalensis samples. A total of 104 samples were collected from 24 provinces, from which DNA was extracted for PCR amplification. The amplification efficiencies of trnH-psbA, petA-psbJ, and ycf4-cemA sequences were 100%, 59.62%, and 25.96%, respectively. The results of sequence analysis showed that 5, 4, and 2 haplotypes were identified based on trnH-psbA, petA-psbJ, and ycf4-cemA sequences, respectively. However, the sequences of haplotypes in commercial samples were different from that of the wild type, and the joint analysis of three fragments of S. baicalensis only identified 6 haplotypes. Furthermore, the phylogenetic analysis and genetic distance analysis indicated that trnH-psbA could be used to identify S. baicalensis from adulterants. The above analysis showed that trnH-psbA was the best fragment for identifying the germplasm resources of commercial S. baicalensis samples. We then analyzed the haplotypes(THap1-THap5) of commercial S. baicalensis samples based on trnH-psbA and found that THap2 was the main circulating haplotype of the commercial samples, accounting for 86.55% of the total samples, which indicated the scarce germplasm resources of commercial S. baicalensis samples. The content of baicalin in all the collected commercial S. baicalensis samples exceeded the standard in Chinese Pharmacopoeia and had significant differences(maximum of 12.21%) among samples, suggesting that the quality of commercial S. baicalensis samples varied considerably. However, there was no significant difference in baicalin content between different provinces or between different haplotypes. This study facilitates the establishment of the standard identification system for S. baicalensis, and can guide the commercial circulation and reasonable medication of S. baicalensis.
Sujet(s)
Mots clés
Texte intégral: 1 Indice: WPRIM Sujet Principal: Phylogenèse / Chromatographie en phase liquide à haute performance / ADN des plantes / Scutellaria baicalensis / Codage à barres de l'ADN pour la taxonomie Type d'étude: Diagnostic_studies langue: Zh Texte intégral: Zhongguo Zhong Yao Za Zhi Année: 2022 Type: Article
Texte intégral: 1 Indice: WPRIM Sujet Principal: Phylogenèse / Chromatographie en phase liquide à haute performance / ADN des plantes / Scutellaria baicalensis / Codage à barres de l'ADN pour la taxonomie Type d'étude: Diagnostic_studies langue: Zh Texte intégral: Zhongguo Zhong Yao Za Zhi Année: 2022 Type: Article