title: [Study on hemiparasitic mechanism of Thesium chinense].
abstract: OBJECTIVE
  To study the hemiparasitic mechanism of Thesium chinense.
  
  
  METHODS
  The anatomical structure of T. chinense was studied by using paraffin slice and electron microscope slice. Chlorophyll content was measured by UV spectrometry. Foliar photosynthesis (P(n)) and gas exchange were measured by using a LI-6400 photosynthesis system.
  
  
  RESULTS
  Chloroplast possesses intact granal thylakoid system, lamella was strong. Vascular tissue of T. chinense was strong. Vessel aperture and its transport power were strong both in root and stem. There were many global haustoriums on lateral roots. Vascular tissues were strong inside haustorium, haustorial stylet penetrated epidermis and cortex of host root, and reached pith place, haustorial vessel was integrated with host root vessel. The maximum of P(n) of T. chinense reached 7.06 micromol x m(-2) x s(-1), its water use efficiency was lower, about 0.735 mmol x mol(-1), its transpiration varied notable in daytime and was relatively invariant at nighttime, and the value of daytime was greatly exceed that of nighttime.
  
  
  CONCLUSIONS
  T. chinense despoils water and nutrition from its host by haustorium. T. chinense can mostly be independent as for C supply by photosynthesis.
authors: Institute of Chinese Medicinal Materials, Nanjing Agricultural University, Nanjing 210095, China.
authors: Fulai
authors: F
authors: Luo
authors: Qiaosheng
authors: Q
authors: Guo
authors: Changlin
authors: C
authors: Wang
authors: Xiaoming
authors: X
authors: Zhang
mesh_terms: D002338:Carotenoids / Q000378:metabolism; D019069:Cell Respiration; D002734:Chlorophyll / Q000378:metabolism; D010788:Photosynthesis; D018515:Plant Leaves / Q000033:anatomy & histology / Q000378:metabolism; D018517:Plant Roots / Q000033:anatomy & histology / Q000378:metabolism; D018547:Plant Stems / Q000033:anatomy & histology / Q000378:metabolism; D029630:Santalaceae / Q000033:anatomy & histology / Q000166:cytology / Q000378:metabolism*; D020524:Thylakoids / Q000378:metabolism; D014867:Water / Q000378:metabolism
chemical_list: D014867:Water; D002734:Chlorophyll; D002338:Carotenoids