马蓝与路边青的matK序列差异与分子鉴定方法分析

2016-11-02 20:07:26魏艺聪陈建雄黄泽豪卢伟梁一池
中国民族民间医药·下半月 2016年6期

魏艺聪+陈建雄+黄泽豪+卢伟+梁一池

【摘 要】 目的:研究拟基于matK序列分析,探讨马蓝与路边青相互鉴别的新方法。方法:从GenBank核酸数据库下载马蓝与路边青matK 序列,应用ClustalX 2.1软件进行SNP鉴别位点分析,应用 MEGA5.0 软件计算种内和种间的(K2P)遗传距离,并构建邻接(NJ)系统聚类树。结果:获得8个马蓝matK序列及12个路边青matK序列,分析显示马蓝与路边青的matK序列具有近百个SNP位点,且其中多是马蓝与路边青特有的,可作为二者间相互鉴别的分子标记。且马蓝的最大种内 K2P 遗传距离0.001 与路边青最大种内 K2P 遗传距离0.005均远远小于马蓝与路边青的种间 K2P 遗传距离0.144~0.149,构建的系统发育树显示马蓝与路边青单独聚为一类。结论:matK序列可为马蓝与路边青的相互鉴别提供新的分子鉴定方法。

【关键词】 马蓝;路边青;matK序列;分子鉴别

【中图分类号】R282.5 【文献标志码】 A 【文章编号】1007-8517(2016)12-0027-03

Abstract:Objective To establish a new molecular method to authenticate Baphicacanthus cusia and Clerodendrum cyrtophyllum by using matK sequences in GenBank nucleicacid database. Methods Based on GenBank Nucleotide Database,matK sequences of Baphicacanthus cusia and Clerodendrum cyrtophyllum were downloaded. The SNP sites of them were checked by ClustalX 2.1 software ,K2P Distances were calculated using MEGA 5.0 software and neighbor-ioining(NJ) phylogenetic tree was established. Results There many specific SNP sites can be used to molecular identification of Centella asiatica and Baphicacanthus cusia. K2P genetic distance of intraspecific genetic distance of Baphicacanthus cusia is 0.001,and Baphicacanthus cusia is 0.005,which was far less than K2P genetic distance between Baphicacanthus cusia and Clerodendrum cyrtophyllum (0.144~0.149). Results of NJ phylogenetic tree showed that Baphicacanthus cusia can be separated from Clerodendrum cyrtophyllum and classified into a separate one.Conclusions MatK sequence is suitable for molecular authentication n of Baphicacanthus cusia and Clerodendrum cyrtophyllum and provides reference for quality and safety identification of Baphicacanthus cusia and Clerodendrum cyrtophyllum .

Keywords:Baphicacanthus cusia; Clerodendrum cyrtophyllum; matK sequence; Identification

马蓝为爵床科植物马蓝Baphicacanthus cusia (Nees) Bremek.,根与叶入药,具有清热解毒、凉血消肿的功效,可用于预防流感、流脑,治疗腮腺炎、急性肠炎、咽喉炎、口腔炎、扁桃体炎、肝炎等炎症。路边青为马鞭草科植物大青 Clerodendrum cyrtophyllum Turcz.,全草入药,具有祛风、除湿、止痛与镇痉等功效。在部分地区常习惯把两者当作中药“大青叶”使用,由于两者化学成分与功效主治均不相同[1-2],因此在用药时应严格鉴别。但两者常分布于同一地区,干燥药材常因变形而不易鉴别,导致相互混淆。两者传统鉴别方法有:叶片显微鉴别法、TLC特征图谱鉴别法等[3-6],但是方法均比较繁杂,急需一种简便、快速、可靠的鉴别方法。……

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