title: [Effect of Water Extracts from Rhizosphere Soil of Cultivated Astragalus membranaceus var. mongholicus on It's Seed Germination and Physiological Characteristics].
abstract: OBJECTIVE
  To explore the relationship between continuous cropping obstacle and autotoxicity of Astragalus membranaceus var. mongholicus.
  
  
  METHODS
  Distilled water(CK), water extracts of rhizosphere soil(50, 100, 200 and 400 mg/mL) were applied to test their effect on early growth and physiological characteristics of Astragalus membranaceus var. mongholicus.
  
  
  RESULTS
  The water extracts from rhizospher soil of cultivated Astragalus membranaceus var. mongholicus significantly increased seedling emergence rate, root length and vigor index of Astragalus membranaceus var. mongholicus seedling when at the concentration of 100 mg/mL or below, however,there was no significant effect at 200 mg/mL or higher. The water extracts from rhizosphere soil of cultivated Astragalus membranaceus var. mongholicus significantly reduced the SOD activity in Astragalus membranaceus var. mongholicus seedling at 400 mg/mL and POD activity at 200 mg/mL and 400 mg/mL,while significantly increased the MDA content.
  
  
  CONCLUSIONS
  Water extracts from Astragalus membranaceus var. mongholicus rhizosphere soil significantly affected Astragalus membranaceus var. mongholicus germination and seedling growth in a concentration-dependent manner, generally, low concentrations increased the SOD and POD activity which improved seed germination and seedling growth, while high concentrations caused cell membrane damage of the seedling.
authors.forename: Duo-yong
authors.initials: DY
authors.lastname: Lang
authors.forename: Xue-yan
authors.initials: XY
authors.lastname: Fu
authors.forename: Jia-wang
authors.initials: JW
authors.lastname: Rong
authors.forename: Xin-hui
authors.initials: XH
authors.lastname: Zhang
mesh_terms: D027885:Astragalus propinquus / Q000254:growth & development*; D018525:Germination; D058441:Rhizosphere; D036226:Seedlings; D012639:Seeds / Q000254:growth & development*; D012987:Soil / Q000737:chemistry*; D014867:Water
chemical_list: D012987:Soil; D014867:Water