title: [Effects of Pb Stress on Photosynthetic Pigment Biosynthesis and Growth of Rabdosia rubescens].
abstract: OBJECTIVE
  To study the impacts of lead (Pb) stress on the leaf photosynthetic pigment and the growth of Rabdosia rubescens,in order to provide a basis for planting area selection and growth regulation.
  
  
  METHODS
  Taking chlorophyll a, chlorophyll b, carotenoids, growth rate, biomass and Pb content as the indexes, the Ramets hydroponic experiments at Pb concentration levels (135,270 and 540 mg/L) in the time(20, 35 and 50 d) were carried out. Photosynthetic pigment content was determined by spectrophotometer, and Pb mass fraction was detected with plasma emission spectrometer.
  
  
  RESULTS
  There was uncertain effect on chlorophyll and carotenoid synthesis in different Pb concentrations in-early period (20 and 35 d). At the time of 50 d, the chlorophyll content was higher in the low-mid Pb concentrations, significantly lower in the high Pb concentration compared with the control group, and there were no significant differences on carotenoid contents in different Pb concentrations.
  
  
  CONCLUSIONS
  Low-mid Pb concentrations can promote chlorophyll synthesis, and the bioaccumulation of high Pb concentration can inhibit the chlorophyll synthesis, and then restrict the growth of Rabdosia rubescens.
authors.forename: Si-xin
authors.initials: SX
authors.lastname: Kong
authors.forename: Hai-kui
authors.initials: HK
authors.lastname: Li
authors.forename: Jing
authors.initials: J
authors.lastname: Chao
authors.forename: Xu-sheng
authors.initials: XS
authors.lastname: Cui
authors.forename: Yu-hai
authors.initials: YH
authors.lastname: Guo
mesh_terms: D018533:Biomass; D002338:Carotenoids / Q000737:chemistry*; D002734:Chlorophyll / Q000737:chemistry*; D000077194:Chlorophyll A; D037602:Isodon / Q000187:drug effects* / Q000254:growth & development; D007854:Lead / Q000494:pharmacology*; D010788:Photosynthesis; D018515:Plant Leaves / Q000737:chemistry
chemical_list: D002734:Chlorophyll; D007854:Lead; D002338:Carotenoids; C037184:chlorophyll b; D000077194:Chlorophyll A