title: [Effects of continuous cropping obstacle on growth of Angelica sinensis and its mechanism].
abstract: OBJECTIVE
  To study the effects of continuous cropping obstacles on growth of Angelica sinensis.
  
  
  METHODS
  The growth indexes, photosynthetic characteristic, activity of leaf protective enzymes, and the yield, essential oil content and extract content were determined.
  
  
  RESULTS
  Continuous cropping decreased the growth and the yield, essential oil content, extract content of A. sinensis. Photosynthetic pigment, which include Chla and Chlb, and photosynthetic rate of A. sinensis leaves decreased. Activity of leaf SOD, POD and CAT were also inhibited. The content of proline, soluble sugar and MDA increased.
  
  
  CONCLUSIONS
  Through decreasing the activity of protective enzymes and their ability of cleaning free radical, continuous cropping made free radical remain in plant so that induced membrane lipid peroxidization, electrolytic leakage became heavier, content of proline and soluble sugar increased. The external manifestation of this influences were that plant growth was inhibited, content of photosynthetic pigments decreased, so did the intensity of photosynthesis and respiration, content of dry mass.
authors: College of Pharmacology, Ningxia Medical University, Yinchuan 750004, China. zhangxh801011@yahoo.com
authors: Xinhui
authors: X
authors: Zhang
authors: Enhe
authors: E
authors: Zhang
authors: Huizhen
authors: H
authors: Wang
authors: Duoyong
authors: D
authors: Lang
mesh_terms: D000383:Agriculture / Q000379:methods*; D029971:Angelica sinensis / Q000737:chemistry / Q000254:growth & development*; D018533:Biomass; D010860:Pigments, Biological / Q000032:analysis
chemical_list: D010860:Pigments, Biological