title: [Study on secondary metabolic organ of echinacoside in herbs of Cistanche tubulosa].
abstract: OBJECTIVE
  It could give some theory support of confirming the secondary metabolism organ and regulation of echinacoside in Cistanche tubulosa by searching parasitic growth of C. tubulosa ahd echinacoside variation in different organs of host and parasite.
  
  
  METHODS
  The echinacoside content was analyzed by HPLC. The relationship between dry matter accumulation and echinacoside accumulation of C. tubulosa as the well as root diameter of host were comparatively analyzed.
  
  
  RESULTS
  With the increase of dry matter accumulation of C. tubulosa, echinacoside accumulation increased significantly, and both of them were in significantly positive correlated with the root diameter of host. Echinacoside content in haustorium phloem was 15.53%, higher than that of haustorium xylem, C. tubulosa plant and other organs.
  
  
  CONCLUSIONS
  Haustorium phloem was probably the secondary metabolism organ of echinacoside in C. tubulosa.
authors.affiliation: Agronomy College, Hebei University of Engineering, Handan 056021, China. yangtaixin@126.com
authors.forename: Tai-Xin
authors.initials: TX
authors.lastname: Yang
authors.forename: Xi-Huan
authors.initials: XH
authors.lastname: Zhang
authors.forename: Jing-Zhu
authors.initials: JZ
authors.lastname: Cai
mesh_terms: D031671:Cistanche / Q000254:growth & development* / Q000378:metabolism* / Q000502:physiology; D006027:Glycosides / Q000378:metabolism*; D006790:Host-Parasite Interactions; D018515:Plant Leaves / Q000378:metabolism; D018517:Plant Roots / Q000033:anatomy & histology* / Q000378:metabolism; D018547:Plant Stems / Q000378:metabolism; D032363:Tamaricaceae / Q000033:anatomy & histology / Q000378:metabolism* / Q000469:parasitology
chemical_list: D006027:Glycosides; C060297:echinacoside