LIU Yafeng1,3，LONG Shengqiao2,3, SHAO Shuxun1
(1. State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China;
2．State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China;
3. University of Chinese Academy of Sciences, Beijing 100049，China)
Abstract：Hyperaccumulator has considerable application potential for nutrient elements biofortification and phytoremediation of heavy metals contamination. Through field investigation and cultivation experiment, the study discussed the intake and accumulation of Se and Cd in Cardamine violifolia. Results show that Se contents in wild Cardamine violifolia are up to hundreds of ppm, and the highest Se content in leaves is 1365 mg/kg. The bioconcentration factor of Se in the overground part is in the range of 2.8-43.8 and most of them are higher than 10; the transfer coefficient is in the range of 0.46-1.88 and most of them are higher than 1. The Cd contents in the overground part of the plant are higher than 100 mg/kg, and most of leaf-Cd contents are between 400 mg/kg and 800 mg/kg. The concentration factor is higher than 1, and bioconcentration factors of Cd in shoots or leaves from farmland and stream area are higher with dozens or over one hundred. Almost all of the biological transfer coefficient of Cd in leaves and stems are higher than 1. Under pot cultivation condition, Se or Cd contents in the plant increase significantly with its increasing gradient of soil, and Se content in the plant is the highest at Se gradient of 50 mg/kg, being 995mg/kg and 1100mg/kg in shoot and root, respectively; Cd content is the highest at Cd gradient of 80mg/kg, being 550mg/kg and 337mg/kg in shoot and root, respectively. Our research suggests that Cardamine violifolia is a Se/Cd multi-element hyperaccumulator, moreover, it potentially has important application prospect in ecological remediation of Se and Cd contamination.
Key words: Cardamine violifolia; hyperaccumulator; selenium; cadmium; bioaccumulation
EARTH AND ENVIRONMENT Vol.46, No.2, Tot No.322, 2018, Page 173-178
