基于代谢组学技术和ITS2序列的恒山黄芪与川黄芪差异性研究

Differences between Hengshanhuangqi and Chuanhuangqi based on metabolomics and ITS2 sequences

为了比较恒山黄芪和川黄芪在分子水平上的差异,首先采用基于1H NMR的代谢组学技术对恒山黄芪和川黄芪进行化学分析,并找出其差异性,然后对药典规定的黄芪甲苷和毛蕊异黄酮葡糖苷含量进行测定,再对二者的ITS2片段进行测序。结果共指认出代谢产物23种,主成分分析显示,恒山黄芪和川黄芪可以明显区分开,恒山黄芪中的天冬氨酸、γ-氨基丁酸和柠檬酸以及黄芪甲苷和毛蕊异黄酮葡糖苷含量较高,而川黄芪中的苏氨酸、丙氨酸、乙酸、胆碱、精氨酸、果糖和蔗糖含量较高,几乎检测不到黄芪甲苷;二者的ITS2序列差异较大,共有8处碱基不同。从化学成分和DNA分子遗传来看,恒山黄芪和川黄芪差异很大。

To compare the differences between Hengshanhuangqi （HH） and Chuanhuangqi （CH） at molecular level, 1H NMR based plant metabolomics approach was used to reveal the chemical difference between HH and CH. Then, the contents of astragaloside IV and calycosin-7-O-β-D-glucoside, the marker compounds specified in China Pharmacopoeia, were determined. In addition, the ITS2 fragments of HH and CH were sequenced. Twenty-three metabolites were identified in the 1H NMR spectrum, and the principal component analysis showed CH and HH could be separated clearly. HH contained more aspartic acid, GABA, citric acid, astragaloside IV and calycosin-7-O-β-D-glucoside, while CH contained more threonine, alanine, acetic acid, choline, arginine, fructose and sucrose. And the astragaloside IV is almost undetectable in CH. In addition, the ITS2 fragment sequences of HH and CH were different at eight bases. Thus, the HH and CH showed significant differences chemically and genetically.