To assess the potential of Pb+2 accumulation in different parts of Acacia victoria, one year old A. victoria seedlings were exposed to Pb2+(NO3)2 in 5 different concentrations: 0, 50, 250, 500 and 1000 (mg Pb2+ L(-1)) for 45 days. Subsequently, Pb2+ uptake was quantified in roots, shoots and leaves of the seedlings by Atomic Absorption Spectroscopy (AAS). In addition, some physiological parameters such as biomass production, shoots and roots length, plant appearance, tissue concentrations and chlorophyll content were examined. Tissue concentrations increased as Pb2+ concentration increased for A. victoria. The visible toxicity symptoms (chlorosis and necrosis) appeared only to the highest concentration (1000 mg Pb2+ L(-1)), resulting in photosynthesis decrease, plant height, root length and dry biomass reduction. Almost 70% (up to 3580 mg Kg(-1) of dry tissue) from the Pb2+ was accumulated in the entire plant tissues was retained in the roots in the seedlings exposed to 1000 mg Pb2+ L(-1). The seedlings accumulated between 403 to 913 mg Kg(-1) of Pb2+ in shoots and 286 to 650 mg Kg(-1) of Pb2+ in leaves at different treatments. Bioconcentration and translocation factors were determined 5.14 and 0.255, respectively. The results show that A. victoria is suitable for lead-phytostabilization in Pb(2+) -contaminated soil.
It is important to understand seasonal heavy metal accumulation in different parts of plants in order to develop the best phytoremediation practices for contaminated soils. For this purpose we exposed, 1 year old A. victoriae seedlings to ZnSO 4 in 4 different concentrations: 0, 50, 250 and 500 mg Zn L -1 for 45 days over two growing seasons. Subsequently, bioaccumulation of Zn in different plant tissues (roots, shoots and leafs) was assessed by Atomic Absorption Spectroscopy (AAS) for two periods. In addition, various growth attributes (dry biomass, shoot and root lengths, plant appearance) and functional traits (leaf area, chlorophyll a, b and total) were measured. The accumulation of Zn was influenced by the Zn concentration in the growth medium and the number of growing seasons. The amounts of Zn concentrated in the root tissues might indicate A. victoriae as a good option for phytostabilization of soils contaminated by Zn. We recommend that if A. victoriae is used for phytoextraction purposes, then it should be harvested at the end of the first growing season (fall) because at this time the concentrations of Zn in the above-ground parts will be maximal.
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