科研之友
微信
新浪微博
Facebook
分享链接
摘要
Phytoremediation is a novel biological remediation technique, and searching for new hyperaccumulators is one of the key points during its application. In the present work, both field investigation (Siding lead-zinc Mines, southern China) and laboratory experiment (incubation with five concentration gradient 0 (CK), 0.5, 1, 2.5 and 5 mg L-1 Cd) were carried out to testify whether Centella asiatica L. is a potential cadmium (Cd) hyperaccumulator. Field results showed that C. asiatica. could grow normally even as the soil concentration of Cd was as high as 124 to 1010 mg kg(-1). In general, Cd concentrations accumulated in leaves, petioles, and stems were over 100 mg k(-1). The ratio of Cd concentration in petioles to that in roots (P/R: the ratio of Cd concentrations in petiole to those in roots) ranged from 0.83 to 1.84, indicating its good translocate ability to aboveground parts. The laboratory experiment further confirmed its capable characteristic for hyperaccumulation and hypertolerance of Cd, i.e., no negative effects on plant growth, high Cd accumulation in tissues, high antioxdative enzyme activities and the appropriate TF values (P/R > 1). All these results suggested that C. asiatica was a new Cd-hyperaccumulator.
