椴属ITS序列特征及在物种鉴定中的应用

Tilia Species ITS Sequence Characteristics and Their Application in Species Identification

  • 摘要: 通过核糖体DNA内转录间隔区(ITS)序列分析,旨在探究椴属物种的序列特征,并应用于天台山"菩提"王树物种鉴定。选取南京椴(Tilia miqueliana)样本,采用CTAB法提取DNA,并通过PCR扩增及测序获得ITS序列;利用DNAStar软件进行序列校对和拼接,并通过MEGA-X软件构建系统发育树,分析南京椴及其近缘种之间的亲缘关系。结果表明,浙江省台州市天台县"菩提"王树的ITS序列与椴属其它物种具有显著差异,证实其为南京椴。此外,通过NCBI-BLAST对比分析,发现南京椴与其它椴属物种的ITS序列相似度在95.81%~97.97%之间,揭示了它们之间的亲缘关系。研究结果不仅为椴属系统分类提供了新的见解,也为理解佛教文化在不同地理环境下的适应和演变提供了重要线索。

     

    Abstract: This study aims to explore the sequence characteristics of Tilia species through the analysis of the internal transcribed spacer(ITS) sequences of ribosomal DNA and apply this to the species identification of the "Bodhi" King tree in Tiantai Mountain. Samples of T. miqueliana were collected from Tiantai County,Taizhou City,Zhejiang Province,and total DNA was extracted using the CTAB method. The ITS sequences were amplified and sequenced via PCR. Sequence alignment and contig assembly were performed using DNAStar software,and a phylogenetic tree was constructed with MEGA-X software to analyze the relationships among T. miqueliana and its close relatives. The results indicated that the ITS sequences of the "Bodhi" King tree from Tiantai showed significant differences from other Tilia species,confirming its identity as T. miqueliana. Additionally,a BLAST comparison revealed sequence similarities ranging from 95.81% to 97.97% between T. miqueliana and other Tilia species,highlighting their phylogenetic relationships. This study not only provides new insights into Tilia taxonomy but also offers significant clues for understanding the adaptation and evolution of Buddhist culture in different geographical environments.

     

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