title: [Responses of physiological ecology and quality evaluation of Rehmannia gltinosa in continuous cropping].
abstract: OBJECTIVE
  To study responses of physiological ecology and quality evaluation of Rehmannia glutinosa in continuous cropping.
  
  
  METHODS
  The potted plant R. glutinosa which consists of first cropping, 1 year continuous cropping and 2 year continuous cropping were used as experimental materials. The photosynthetic activity, descending axis vitality, the protective enzymes system and MDA content were measured, the quality was evaluated by FTIR and HPLC.
  
  
  RESULTS
  Continuous cropping reduced the content of chlorophyll in the non-first cropping R. glutinos, the photosynthetic activity and descending axis vitality were weakened. Because of the increase of the free radical in the R. glutinos due to the continuous cropping, the activity of protective enzymes including POD, SOD and CAT were enhanced and MDA content were increased, more importantly the medical potency declined . And along with the increasing years of the continuous cropping, this effect becomes even stronger.
  
  
  CONCLUSIONS
  Continuous cropping affects the descending axis ability of absorbing water and nutrition and photosynthesis are inhibited R. glutinosa, at the same time, it also causes the disorders of antioxidation systems in R. glutinos, resulting in continuous cropping obstacle and decline of the medicinal materials quality.
authors.affiliation: Institute of Chinese Medicinal Materials, Henan Agriculture University, Zhengzhou 450002, China. hauzzy@163.com
authors.forename: Zhongyi
authors.initials: Z
authors.lastname: Zhang
authors.forename: Gailing
authors.initials: G
authors.lastname: Li
authors.forename: Miaomiao
authors.initials: M
authors.lastname: Niu
authors.forename: Huamin
authors.initials: H
authors.lastname: Fan
authors.forename: Juan
authors.initials: J
authors.lastname: Li
authors.forename: Wenxiong
authors.initials: W
authors.lastname: Lin
mesh_terms: D000975:Antioxidants / Q000378:metabolism; D004463:Ecology; D010788:Photosynthesis / Q000502:physiology; D032267:Rehmannia / Q000201:enzymology / Q000254:growth & development* / Q000378:metabolism / Q000502:physiology*; D013482:Superoxide Dismutase / Q000378:metabolism
chemical_list: D000975:Antioxidants; D013482:Superoxide Dismutase