Molecular Identification and Taxonomic Implication of Herbal Species in Genus Corydalis (Papaveraceae).

Molecular Identification and Taxonomic Implication of Herbal Species in Genus Corydalis (Papaveraceae).
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延胡索属(罂粟科)草药物种的分子鉴定及其分类学意义

DOI:
10.3390/molecules23061393
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发表时间:
2018-06-08
期刊:
Molecules (Basel, Switzerland)
影响因子:
--
通讯作者:
Zhang W
Zhang W
中科院分区:
其他
文献类型:
--
作者:
Jiang L;Li M;Zhao F;Chu S;Zha L;Xu T;Peng H;Zhang W

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在东亚,许多堇菜科植物都被用作药用植物,其中最著名的物种是《中国药典》中的延胡索堇菜(Corydalis yanhusuo)和颓子堇菜(C. decumbens)。然而,由于这些物种的形态差异很大,因此鉴定这些物种仍然是个难题。在此,我们选择了 14 个亲缘关系较近的物种和 5 个基因组区域(叶绿体:matK、trnG、rbcL、psbA-trnH;核:ITS)来探讨 DNA 条形码在鉴定这些药材中的应用。此外,还使用了泊松树过程(PTP)和自动条形码间隙发现(ABGD),并与 DNA 条形码进行了比较。我们的研究结果表明,由于堇菜中 ITS 区域具有异质性,因此不适合进行分子分析。相比之下,matK 是一个理想的物种鉴定区域,因为当 matK 与其他三个叶绿体区域一起使用时,所有物种都能被解析出来。我们发现,通过 ABGD 和 PTP 方法,至少有五个传统鉴定的物种被归为一个遗传物种;因此,使用形态学方法高估了物种多样性。总之,我们首次尝试对堇菜药材进行分子分析,成功地解决了药用物种的鉴定问题,并促进了对其分类学的重新评估。
Many species of Corydalis (Papaveraceae) have been used as medicinal plants in East Asia, and the most well-known species are Corydalis yanhusuo and C. decumbens in the Pharmacopoeia of China. However, authentication of these species remains problematic because of their high morphological variation. Here, we selected 14 closely related species and five genomic regions (chloroplast: matK, trnG, rbcL, psbA-trnH; nuclear: ITS) to explore the utility of DNA barcoding for authenticating these herbs. In addition, the Poisson tree process (PTP) and automatic barcode gap discovery (ABGD) were also used and compared with DNA barcoding. Our results showed that the ITS region was not suitable for molecular analysis because of its heterogeneous nature in Corydalis. In contrast, matK was an ideal region for species identification because all species could be resolved when matK was used along with the other three chloroplast regions. We found that at least five traditional identified species were lumped into one genetic species by ABGD and PTP methods; thus, highlighting the overestimation of species diversity using the morphological approach. In conclusion, our first attempt of molecular analysis of Corydalis herbs presented here successfully resolved the identification of medicinal species and encouraged their taxonomic re-assessment.
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影响因子: 1.9
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