A Study on the Accumulation Pattern of Cadmium in Coptis Chinensis Franch

Abstract

Along with the increasing recognition of traditional Chinese medicine (TCM) in the world, the safety of TCM has also received worldwide attention. The problem of excessive heavy metals in TCM including coptis chinensis , is frequently reported, which not only affects its safety, but also seriously affect s its export. As everyone knows, cadmium(Cd) was a harmful element for the healthy of plants. Though the liquid nutrient solution cultivating methods, The law of cadmium accumulation in Coptis chinensis was studied. Hogland culture medium with 0 and
100µM Cd(NO 3 2 ·4H 2 O was prepared manually. The results show that, accumulation amount of Cd by root (2.017 95.428 mg kg 1 ) was notable higher than stems and leaves(0.242 11.382 mg kg 1 ) during the 10 day growth period When the cadmium content added to the growth medium is compared with the total accumulation of plants and the residual cadmium content in the medium, a large amount of cadmium may be lost through the process of
plant volat ilization. This is of great significance for Coptis chinensis to tolerate heavy metals and reduce plant enrichment.