title: [Nuclear ribosomal DNA internal transcribed spacer 1 sequences of 4 Leonurus species].
abstract: OBJECTIVE
  To analyze the nuclear ribosome DNA (nrDNA) internal transcribed spacer (ITS) sequences of 4 Leonurus species, and the possibility of using them for molecular authentication of the crude drugs from the genus.
  
  
  METHODS
  The nrDNA ITS sequence (including ITS1, 5.8S rDNA, ITS2, and partial 18S rDNA and 26S rDNA) of L. japonicus and its 3 adulterant species were amplified and sequenced, and CLUSTRAL X and MEGA software was employed for analysis.
  
  
  RESULTS
  The variation of ITS1 and ITS2 between L. japonicus and its adulterant species ranged between 7.2% and 18.8% and between 14.2% and 27%, respectively. The phylogenic tree derived from the dendrograms based on the ITS sequence data contained some discrepancy from the traditional classification.
  
  
  CONCLUSIONS
  The nrDNA ITS sequences can be used potentially as efficient markers for identification of L. japonicus and its adulterants, and further study is needed for studying the phylogeny of Leonurus.
authors.affiliation: School of Pharmacy, Fudan University, Shanghai 200032, China.
authors.forename: Zhi-ye
authors.initials: ZY
authors.lastname: Yang
authors.forename: Zhi
authors.initials: Z
authors.lastname: Chao
authors.forename: Ke-ke
authors.initials: KK
authors.lastname: Huo
authors.forename: Bing-yi
authors.initials: BY
authors.lastname: Wu
authors.forename: Sheng-li
authors.initials: SL
authors.lastname: Pan
mesh_terms: D018744:DNA, Plant / Q000737:chemistry / Q000235:genetics*; D021903:DNA, Ribosomal Spacer / Q000737:chemistry / Q000235:genetics*; D031332:Leonurus / Q000145:classification / Q000235:genetics*; D008969:Molecular Sequence Data; D010802:Phylogeny; D017422:Sequence Analysis, DNA; D013045:Species Specificity
chemical_list: D018744:DNA, Plant; D021903:DNA, Ribosomal Spacer