Abstract
The subcellular distributions of cadmium, chromium, copper, plumbum and zinc in hyperaccumulator (Pterts vittata and Solanum nigrum) and accumulator (Conyza Canadensis and Digitaria sanguinalis) had been studied in pot experiment. The results showed that hyperaccumulator and accumulator had different accumulation capacity of five heavy metals. The total content of five heavy metals in four plants roots was followed the order: P. vittata > S. nigrum > D. sanguinalis > C. Canadensis, and the total content of five heavy metals in four plants shoots was: S. nigrum > D. sanguinalis > P. vittata > C. canadensis. So, S. nigrum is the best repair material, followed by D. sanguinalis. The subcellular distributions of five heavy metals in the same hyperaccumulator or accumulator were different, indicating that different plants had different detoxification mechanism for different heavy metals. The proportion order of subcellular distribution of total heavy metal content in four plants roots was: F1 > F3 > F2, and the shoots had the same order. It could be conclude that plants weaken the toxicity of heavy metal by accumulating more heavy metal in the cell wall.
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