Differential expression of zinc accumulation during two growing seasons of Acacia victoriae

来源 :Journal of Forestry Research | 被引量 : 0次 | 上传用户:yayabaobao123
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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 Zn SO_4 in 4 different concentrations:0, 50, 250 and 500 mg Zn L~-1for 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. 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 we exposed, 1 year old A. victoriae seedlings to Zn SO_4 in 4 different concentrations: 0, 50 , 250 and 500 mg Zn L ~ -1 for 45 days over two growing seasons. After, 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. accumulation of Zn was influenced by the Zn concentration in the growth medium and the number of growing sements. The amounts of Zn concentrated in the root tissues MESSAGE A. victoriae as a good option for phytostabilization of soils contaminated by Zn. We recommend that if A. victoriae is used for phytoextraction purp oses, then it should be harvested at the end of the first growing season (fall) because at this time the concentration of Zn in the above-ground parts will be maximal.
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