5S—rRNA基因间区序列变异用于金银花药材道地性研究初探

目的;研究金银花药材道地性形成的基因基础。方法：用SDS法提取金银花Lonicera japonica不同居群,外类群细毡毛忍冬L.similis和山银花L.confusa的总DNA,进行5S－rRNA基因间区的PCR扩增和测序,并用软件Mega进行分析。结果：Lonicera L.属植物5S－rRNA基因间区约210bp,其中G＋C含量较高,达70％左右,不同居群的L.japonica碱基序列有差别,通过测序可以进行鉴别。L.confusa与L.japonica间的遗传距离较大。结论：种间5S－rRNA基因间区的序列差异大于种内;道地药材之间的遗传距离较小;道地与非道地药材之间的遗传距离大于道地药材之间的遗传距离。

Preliminary attempt to identify geoherbalism of Flos Lonicerae by sequence diverggence of 5S-rRNA ggene spacer region

Object To study the formation of geoherbalism of Flos Lonicerae on the molecular level Methods Genomic DNAs from different populations of Lonicera japonica Thunb , outgroup Lonicera similis Hemsl , and Lonicera confusa DC were extracted, the 5S rRNA gene spacer region amplified, sequuenced, and analysed with Mega 1 02 Results The fragments of 5S rRNA gene spacer region in Lonicera L was about 210 bp with G C content up to about 70% The sequences were different in various populations, and can be identified by sequencing The genetic distance between L confusa and L japonica was larger Conclusion The genuine distance between species was larger than that within species; the genetic distance among genuine crude drugs was smaller; the genetic distance among genuine and ungenuine crude drugs were bigger than that among genuine crude drugs