title: [Effect of water stress on content of active constituents in Erigeron breviscaps].
abstract: OBJECTIVE
  To study the effect of water stress on the content of scutellarin and caffeate in Erigeron breviscaps.
  
  
  METHODS
  Fv/Fm, N content, as well as the content of scutellarin and caffeate under three water grads were measured.
  
  
  CONCLUSIONS
  Fv/Fm of the plant decreased significantly in 8% and 23% water treatment, that proved drought and waterlogging occurred. Under the two conditions, the contents of N were lower but the contents of active constituents were higher than those under 15% treatment. The results support the carbon-nutrient balance hypothesis and the "stress effect hypothesis" for the formation of geo-herbs.
authors: Institute of Ecology, Kunming 650091, China.
authors: Ya'ni
authors: Y
authors: Zhang
authors: Wenhua
authors: W
authors: Su
authors: Guangfei
authors: G
authors: Zhang
mesh_terms: D047310:Apigenin / Q000378:metabolism* / Q000627:therapeutic use; D002110:Caffeine / Q000494:pharmacology; D003681:Dehydration / Q000188:drug therapy / Q000628:therapy; D055864:Droughts; D049919:Erigeron / Q000737:chemistry* / Q000254:growth & development / Q000378:metabolism; D018506:Gene Expression Regulation, Plant; D005965:Glucuronates / Q000378:metabolism* / Q000627:therapeutic use; D028321:Plant Preparations / Q000627:therapeutic use; D018526:Plant Transpiration / Q000187:drug effects; D010946:Plants, Medicinal / Q000737:chemistry; D013696:Temperature; D014867:Water / Q000502:physiology*
chemical_list: D005965:Glucuronates; D028321:Plant Preparations; D014867:Water; C484876:scutellarin; D002110:Caffeine; D047310:Apigenin