LI Fengchao,LI Huimin,YIN Xianmei,et al.Molecular Identification of Tibetan Codonopsis Plants Based on ITS2 and psbA-trnH Barcode[J].Chinese Journal of Experimental Traditional Medical Formulae,2022,28(13):173-180.
LI Fengchao,LI Huimin,YIN Xianmei,et al.Molecular Identification of Tibetan Codonopsis Plants Based on ITS2 and psbA-trnH Barcode[J].Chinese Journal of Experimental Traditional Medical Formulae,2022,28(13):173-180. DOI: 10.13422/j.cnki.syfjx.20220717.
Molecular Identification of Tibetan Codonopsis Plants Based on ITS2 and psbA-trnH Barcode
To identify the molecular biology of various species of Tibetan
Codonopsis
plants based on internal transcribed spacer(ITS)2 and
psbA-trnH
sequence barcode technology.
Method
2
The genomic DNA of 28 Tibetan
Codonopsis
plant samples from four species (
Codonopsis canescens
,
C. foetens
subsp.
nervosa
,
C. pilosula
, and
C. thalictrifolia
var.
mollis
) were extracted,and the ITS2 and
psbA-trnH
sequences were amplified and sequenced. The related sequences of 81 Tibetan
Codonopsis
plant samples belonging to 15 species were downloaded from GenBank, and MEGA 6.0 was used for sequence comparison and mutation site analysis. The GC content and genetic distance within and between species were calculated. Additionally, phylogenetic trees were constructed by maximum likelihood (ML) method, neighbor-joining (NJ) method,and unweighted pair-group method with arithmetic means (UPGMA) .
Result
2
According to the mutation site,
C. canescens
,
C. pilosula
,
C. pilosula
subsp.
tangshen
,
C. pilosula
var.
modesta
,
C. bhutanica
,
C. clematidea
,
C. lanceolata
,
C. subglobosa
and
C. foetens
were distinguished. In the phylogenetic trees,the optimal clustering effects for ITS2 and
psbA-trnH
sequences were obtained using the ML method and the UPGMA method, respectively, and 12 species were effectively clustered.
Conclusion
2
ITS2 and
psbA-trnH
sequences have a high identification rate for species of single origin,but there are still some limitations in identifying variants and original variants. This study provides basis for the identification of affinity relationship and clinical safety of Tibetan
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