Bidens tripartite L.: a Cd-accumulator confirmed by pot culture and site sampling experiment.
Characteristics of accumulation and tolerance of cadmium (Cd) in Bidens tripartite L. were investigated to identify Cd-accumulating properties. In this study, pot culture experiment and site sampling experiments were conducted to assess whether this plant is a heavy metal hyperaccumulator or accumulator. The results indicated that the Cd enrichment factor (concentration in plant/soil) and Cd translocation factor (concentration in shoot/root) of B. tripartite was principally >1 in pot culture and concentration gradient experiments. Shoot biomass was not reduced significantly (p<0.05) compared to the controls. However, the Cd concentration in B. tripartite shoots was not higher than 100 mg kg(-1), the threshold concentration for a Cd-hyperaccumulator. In the site sampling experiment, B. tripartite also showed Cd-accumulator properties. Based on these results, B. tripartite could be identified as a Cd-accumulator. Thus, B. tripartite should only be considered as a Cd-accumulator.
Wei
Shuhe
S
Key Laboratory of Terrestrial Ecological Process, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, PR China. shuhewei@yahoo.com.cn
Niu
Rongcheng
R
Srivastava
Mrittunjai
M
Zhou
Qixing
Q
Wu
Zhijie
Z
Sun
Tieheng
T
Hu
Yahu
Y
Li
Yunmeng
Y
D031176:Bidens / Q000737:chemistry / Q000378:metabolism*; D018533:Biomass; D002104:Cadmium / Q000737:chemistry / Q000378:metabolism*; D018515:Plant Leaves / Q000737:chemistry; D018520:Plant Shoots; D018547:Plant Stems / Q000737:chemistry; D012722:Sewage / Q000032:analysis; D012987:Soil / Q000032:analysis; D007507:Therapeutic Irrigation
D012722:Sewage; D012987:Soil; D002104:Cadmium