title: [Karyotype analysis of three Lonicera species growth in Sichuan].
abstract: OBJECTIVE
  To provide the genetic reference for development and application of Lonicera species growth in Sichuan.
  
  
  METHODS
  Shoot apices cells from Lonicera japonica, Lonicera japonica var. chinensis and Lonicera similis (cultivars) were used to make the chromosomal preparation. Their karyotypes were analyzed and the relevant parameters of chromosomes were measured by improved chromosome preparation technique.
  
  
  RESULTS
  The chromosome numbers of three Lonicera species were 2n = 2X = 18; their chromosome length was 30.747, 33.231 and 36.948 microm; Their karyotype formula was 2n = 2X = 18 = 2m + 7sm, 2n = 2X = 18 = 8m + 8sm + 2st and 2n = 2X = 18 = 8sm + 10m; Their As. k was 64.013%, 64.380% and 61.949%; And their karyotypes belonged to 2B, 2B and 2A type, respectively.
  
  
  CONCLUSIONS
  These three Lonicera species can be of the germplasm resources for widely cultivating since they have high degree genetic evolution.
authors.forename: Qiu-Jie
authors.initials: QJ
authors.lastname: Yan
authors.forename: Li-Juan
authors.initials: LJ
authors.lastname: Zou
authors.forename: Ting-Ting
authors.initials: TT
authors.lastname: Tian
authors.forename: Li
authors.initials: L
authors.lastname: Wang
authors.forename: Xiao-Lu
authors.initials: XL
authors.lastname: Shen
authors.forename: Ming-Hua
authors.initials: MH
authors.lastname: Luo
mesh_terms: D002681:China; D032461:Chromosomes, Plant / Q000235:genetics*; D004171:Diploidy; D019143:Evolution, Molecular; D059785:Karyotype; D007621:Karyotyping; D031239:Lonicera / Q000145:classification / Q000166:cytology* / Q000235:genetics*; D008938:Mitosis; D018547:Plant Stems / Q000166:cytology / Q000235:genetics; D013045:Species Specificity