title: [Influence of exogenous substance on germination of Platycodon grandiflorum seeds].
abstract: OBJECTIVE
  To study of exogenous substances on the germination rate of Platycodon grandiflorum and offer the basis for the standardized culture of P. grandiflorum.
  
  
  METHODS
  At 25 degrees C, under darkness and lightness, do pretreatmeats on seeds by using GA3, H2O2, KMnO4, PEG at different concentrations.
  
  
  RESULTS
  The results indicated that the pretreatments with GA3 at a concentrating of 50-250 mg x L(-1) and 1%-2% of H2O2 could increase germination of P. grandiflorum seed at a certain degree. Contrariwise 0.1%-0.5% of KMnO4 and 15%-35% of PEG inhibited the germination.
  
  
  CONCLUSIONS
  Pretreatment with 50-250 mg x L(-1)GA3 and H2O2 at a low cencontration could increase the seed germination of P. grandiflorum.
authors.affiliation: Institute of Chinese Medicinal Materials, Nanjing Agricultural University, Nanjing 210095, China.
authors.forename: Rong-mei
authors.initials: RM
authors.lastname: Zhao
authors.forename: Li
authors.initials: L
authors.lastname: Liu
authors.forename: Qiao-sheng
authors.initials: QS
authors.lastname: Guo
mesh_terms: D004305:Dose-Response Relationship, Drug; D018525:Germination / Q000502:physiology*; D005875:Gibberellins / Q000008:administration & dosage / Q000494:pharmacology*; D006861:Hydrogen Peroxide / Q000008:administration & dosage / Q000494:pharmacology; D008027:Light; D010937:Plant Growth Regulators / Q000494:pharmacology*; D010946:Plants, Medicinal / Q000254:growth & development* / Q000502:physiology; D031238:Platycodon / Q000254:growth & development* / Q000502:physiology; D011092:Polyethylene Glycols / Q000494:pharmacology; D011196:Potassium Permanganate / Q000494:pharmacology; D012639:Seeds / Q000254:growth & development / Q000502:physiology
chemical_list: D005875:Gibberellins; D010937:Plant Growth Regulators; D011196:Potassium Permanganate; D011092:Polyethylene Glycols; D006861:Hydrogen Peroxide; C007842:gibberellic acid