title: [Studies on classification criteria of Codonopsis pilosula var. modesta seedlings in southern of Gansu].
abstract: OBJECTIVE
  To reveal the quality grade of Codonopsis pilosula var. modesta seedlings from Gansu and provide the scientific basis for establishment of the seedling quality classification standard.
  
  
  METHODS
  Thirty batches of C. pilosula var. modesta seedlings collected from varied producing area of Gansu were selected as testing materials, the fresh weight of single plant, water content, length of seedling, diameter of seedling, length of bud and number of buds were determined and the grading standard were systemically analyzed by K-Means Cluster.
  
  
  RESULTS
  The C. pilosula var. modesta seedlings could be divided into 3 grades of criteria, i. e. the first-grade seedlings were at least 14.1 g of the fresh weight of seedling, 24.0 cm of length of seedling, 1.17 cm of diameter of seedling; the second-grade seedlings were 14.0-3.5 g of the fresh weight of seedling, 23.9-21.6 cm of length of seedling, 1. 16-0. 68 cm of diameter of seedling; the third-grade seedlings were 3.4-1.9 g of the fresh weight of seedling, 21.5-13.5 cm of length of seedling, 0.67-0.54 cm of diameter of seedling.
  
  
  CONCLUSIONS
  Among 30 batches of C. pilosula var. modesta seedlings, 66.7% of the seedlings belonged to the first and the second grades. It suggests that the first and the second grade seedlings should be used in the standard production.
authors: Gansu Key Laboratory of Crop Genetic & Germplasm Enhancement, Demonstration Center of Experiments and Teaching for Plant Productions, Gansu Agricultural University, Lanzhou 730070, China. liruijie2805@163.com
authors: Rui-Jie
authors: RJ
authors: Li
authors: Yuan
authors: Y
authors: Chen
authors: Feng-Xia
authors: FX
authors: Guo
authors: Lianhu
authors: L
authors: Sun
authors: Yong-Wei
authors: YW
authors: Mi
mesh_terms: D002681:China; D029745:Codonopsis / Q000737:chemistry* / Q000145:classification / Q000254:growth & development*; D011786:Quality Control; D036226:Seedlings / Q000737:chemistry / Q000145:classification / Q000254:growth & development