title: [Numerical analysis of morphological variation of germplasm resources of Chrysanthemum morifolium for medicine].
abstract: OBJECTIVE
  Botanical characters of germplasm resources of Chrysanthemum morifolium for medicine were observed and compared, which could offer reference for its genetic improvement and germplasm resources protection.
  
  
  METHODS
  Based on the random blocks field experiments design, twenty-six morphological traits were observed. The morphological differences among germplasm resources were compared by principal component analysis and cluster analysis.
  
  
  RESULTS
  The coefficient of variation values for 17 of 26 traits indicated a high level of variation (above 20%). Six principal components which accounted for 77.14% of total variance were extracted from the principal component analysis. The 29 germplasm resources could be divided into two clusters.
  
  
  CONCLUSIONS
  There were large morphological variation among germplasm resources on Ch. morifolium for medicine.
authors.affiliation: Institute of Chinese Medicinal Materials, Nanjing Agricultural University, Nanjing 210095, China. sqszjfc@126.com
authors.forename: Qingsong
authors.initials: Q
authors.lastname: Shao
authors.forename: Qiaosheng
authors.initials: Q
authors.lastname: Guo
authors.forename: Yuchuan
authors.initials: Y
authors.lastname: Li
authors.forename: Pengfei
authors.initials: P
authors.lastname: Mao
mesh_terms: D002681:China; D031202:Chrysanthemum / Q000033:anatomy & histology* / Q000737:chemistry / Q000254:growth & development*; D010946:Plants, Medicinal / Q000033:anatomy & histology* / Q000737:chemistry / Q000254:growth & development*