不同产地何首乌的ITS序列研究

目的研究不同产地何首乌的ITS片段遗传差异性,分析该片段在何首乌道地性的DNA分子鉴别和野生资源品种的鉴定及种质资源研究中的意义。方法从来自不同原产地的何首乌中提取总DNA,以核基因组ITS通用引物为引物进行扩增,扩增产物经纯化后,用PCR产物直接测序法进行测序。结果各样品rDNA的ITS及5.8S rDNA完全序列,18S和26S rDNA部分序列,共约648bp,其中ITS1长度为195bp,5.8S长度为164bp,ITS2长度为189bp。序列间共有17个变异位点。结论ITS序列可对何首乌的道地性做出鉴别,对野生资源品种的鉴定具有较好的分辨性。

Analysis of rDNA ITS sequences in root tuber of Polygonum multiflorum from various habitats

Objective To study the genetic diversity of rDNA ITS sequences in the root tuber of Polygonum multiflorum from various habitats and to analyze the utility of ITS sequences in molecular authenticating the genuineness, identifying the varieties of wild resources, and studying the germplasm resources. Methods Firstly, total DNA in the root tuber of P. multiflorum from various habitats was extracted. Secondly, the ITS sequence was amplified by PCR with universal primer of ITS and sequenced after purification. Results The total length of ITS sequence is 648 bp in the different samples, such as 5.8S, 18S, and 26S rDNA. The lengths of three fragments, ITS1, 5.8S, and ITS2, are 195 bp, 164 bp, and 189 bp, respectively. There are seventeen variable sites among the sequences. Conclusion ITS Sequence can be used to authenticate the genuineness and identify the varieties of wild resources in the root tuber of P. multiflorum.