title: [Quality classification standard of Aucklandia lappa seed].
abstract: OBJECTIVE
  To establish a quality classification standard for Aucklandia lappa.
  
  
  METHODS
  Seed purity, 1 000-grain weight, germination rate, water content of 37 seed samples from different areas were measured, and seed external characters were observed. The cluster analysis was applied for establishment of the primary quality classification standard of A. lappa seed.
  
  
  RESULTS
  The seed quality grading of A. lappa was described as three grades. The seed quality of each grade should reach following requirements: for first grade seeds, seed germination rate > or = 85%, purity > or = 99%, 1 000-grain weight > or = 26.0 g, water content < or = 8.8%; for second grade seeds, seed germination rate > or = 70%, purity > or = 98%, 1 000-grain weight > or = 23.8 g, water content < or = 10%; for third grade seeds, seed germination rate > or = 50%, purity > or = 96%, 1 000-grain weight > or = 23.0 g, water content < or = 11%.
  
  
  CONCLUSIONS
  This quality classification standard of A. lappa can be used as the quality control standard of A. lappa.
authors.affiliation: Institute of Material Medical Planting, Chongqing Academy of Chinese Materia Medica, Chongqing Engineering Research Center for Fine Variety Breeding Techniques of Chinese Materia Medica, Chongqing 400065, China.
authors.forename: Yu
authors.initials: Y
authors.lastname: Wang
authors.forename: Xue
authors.initials: X
authors.lastname: Zhang
authors.forename: Daxi
authors.initials: D
authors.lastname: Chen
authors.forename: Longyun
authors.initials: L
authors.lastname: Li
authors.forename: Taiqing
authors.initials: T
authors.lastname: Cheng
mesh_terms: D019659:Asteraceae / Q000254:growth & development*; D010946:Plants, Medicinal / Q000254:growth & development; D011786:Quality Control; D012639:Seeds / Q000502:physiology