黄草乌及其混淆品ITS序列的分析鉴别

Study on ITS Sequences of Aconitum vilmorinianum and its Medicinal Adulterant

目的:比较黄草乌及其混淆品滇南草乌ITS序列的差别。方法:分别提取黄草乌及滇南草乌总DNA,进行PCR扩增、扩增产物直接测序,利用DNAStar、ClustalX1.81及MEGA4.0软件进行序列分析。结果:通过对黄草乌及其混淆品的ITS数据矩阵,得到ITS1产生229个一致位点、19个变异位点和13个信息位点;5.8S产生162个一致位点、2个变异位点和1个信息位点;ITS2产生217个一致位点、3个变异位点和1个信息位点。除了5.8S没有碱基的转换和颠换,ITS1存在2个碱基转换和1个颠换,ITS2只存在1个颠换。黄草乌2个居群和滇南草乌3个居群的ITS测序结果经数据矩阵分析后,发现二者ITS2区间第596个碱基处为鉴定二者的稳定的信息位点,黄草乌2个居群的所有样品在此位点的碱基为(C),而滇南草乌3个居群的所有样品在此位点的碱基为(A)。结论:黄草乌与其混淆品滇南草乌的核rDNA的ITS序列存在碱基的差异,有特定的变异位点,且位点变异表现出ITS1大于ITS2,因此,能在分子水平上将二者分开。

Objective：To analyze and compare the ITS sequences of Aconitum vilmorinianum and its medicinal adulterant Aconitum austroyunnanense. Methods ： Total genomic DNA were extracted from sample materials by improved CTAB method, ITS sequences of samples were amplified using PCR systems, directly sequenced and analyzed using software DNAStar, ClustalX1.81 and MEGA 4.0. Results： 299 consistent sites, 19 variable sites and 13 informative sites were found in ITS1 sequences, 162 consistent sites,2 variable sites and 1 informative sites were found in 5. 8S sequences,217 consistent sites,3 variable sites and 1 informative site were found in ITS2 sequences. Base transition and transversion was not found only in 5.8S sequences,2 sites transition and 1 site transversion were found in ITS1 sequences, only 1 site transversion was found in ITS2 sequences comparting the ITS sequences data matrix. By analyzing the ITS sequences data matrix from 2 population of Aconitum vilmorinianum and 3 population of Aconitum austroyunnanense, we found a stable informative site at the 596th base in ITS2 sequences, in all the samples of Aconitum vilmorinianum the base was C, and in all the samples of Aconitum austroyunnanense the base was A. Conclusion ： Aconitum vilmorinianum and Aconitum austroyunnanense can be identified by their characters of ITS sequences ,and the variable sites in ITS1 sequences are more than in ITS2 sequences.