ACCUMULATION AND SUBCELLULAR DISTRIBUTION OF CADMIUM IN THE DIFFERENT ORGANS OF HYDROPONICALLY GROWN IMPATIENS WALLERIANA

摘要

Impatiens (Impatiens walleriana) was validated as a potential Cd hyperaccumulator when growing in the contaminated soils. Rooted cuttings were hydroponically grown in the Cd solutions with different concentrations and the accumulation and subcellular distribution of Cd in the various organs were analyzed after growing for 25 days and 50 days. Experimental results show that the root, stem, and leaf accumulated approximately 120-1850, 60-1750, and 50-1450 mg/kg of Cd, respectively. Results of the subcellular distribution revealed that Cd was mainly compartmentalized in the soluble fraction in the roots. Nevertheless, most of the Cd was in the cell wall fraction in the leaves. Different growing periods changed the subcellular distribution in the stems and also the upward translocation of Cd.