title: [Effects of lead, copper and cadmium stresses on growth and inherent quality of Prunalla vulgaris].
abstract: OBJECTIVE
  Prunalla vulgaris was used as the experimental material to study the effects of lead (Pb), copper (Cu) and cadmium (Cd) on the related physiological and growth indexes of the plant.
  
  
  METHODS
  By referencing the GAP and the soil environmental quality standard, the growth and inherent quality of the plant were observed under different concentrations of the heavy metals stresses. The data were statistically processed.
  
  
  RESULTS
  The results showed that the plant grew normally when the heavy metal concentrations in soil were close to up limits of the soil environmental quality standard II. The content of heavy metal in spica met the requirement of the standard, and under the circumstances the content of ursolic acid was increased in a certain range. The critical values of Pb, Cu, Cd in the P. vulgaris grown soil were set at 450, 100, 1.0 mg x kg(-1), respectively.
  
  
  CONCLUSIONS
  The harmful influence of the heavy metal stress at a lower concentration is lighter than at a higher concentration, and it could increase the content of ursolic acid. The stress of Pb, Cu and Cd is more obvious than that of Zn.
authors.affiliation: Insititute of Chinese Medicinal Materials, Nanjing Agricultural University, Najing 210095, China.
authors.forename: Zheng
authors.initials: Z
authors.lastname: Wu
authors.forename: Qiaosheng
authors.initials: Q
authors.lastname: Guo
authors.forename: Qingya
authors.initials: Q
authors.lastname: Wang
authors.forename: Lijun
authors.initials: L
authors.lastname: Zhou
authors.forename: Zhiyuan
authors.initials: Z
authors.lastname: Zhang
authors.forename: Lixia
authors.initials: L
authors.lastname: Zhang
authors.forename: Tao
authors.initials: T
authors.lastname: Huang
mesh_terms: D002104:Cadmium / Q000633:toxicity*; D003300:Copper / Q000633:toxicity*; D019686:Lamiaceae / Q000187:drug effects* / Q000254:growth & development* / Q000502:physiology; D007854:Lead / Q000633:toxicity*; D010946:Plants, Medicinal / Q000187:drug effects* / Q000254:growth & development* / Q000502:physiology
chemical_list: D002104:Cadmium; D007854:Lead; D003300:Copper