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Growth performance, photosynthetic status and bioaccumulation of heavy metals by Paulownia tomentosa (Thunb.) Steud growing on contaminated soils

Nada Ben Bahri, Bochra Laribi, Sihem Soufi, Salah Rezgui, Taoufik Bettaieb

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Int. J. Agron. Agri. Res.6(4), 32-43, April 2015

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Abstract

This work focuses on the study of the potential of a woody specie Paulownia tomentosa (Thunb.) Steud in the phytoremediation of soils polluted by heavy metals. Total metal concentrations in soil samples as well as their bioaccumulation in plant tissues were performed by Atomic Absorption Spectrometry. Bioaccumulation factors (BF) and translocation factors (TF) were calculated in order to determine the effectiveness of plants in removing heavy metals from soil. Results showed that heavy metals significantly affected the root biomass production compared to the leaf biomass and caused slight reductions in all growth parameters. However, the presence of high amounts of ETM in polluted substratum restricted the synthesis of chlorophyll pigments and lead to the deterioration of photosynthetic parameters. Zn, Pb and Cd were found in plant shoots and roots at different levels, between 5.083 and 205.33 mg kg-1 DMW for Zn, 23.22 and 50.13 mg kg-1 DM for Pb and between 0 and 3.88 mg kg-1 DMW for Cd. Translocation and bioaccumulation factors indicated that Paulownia tomentosa could be used in the phytoextraction of Zn and Pb.

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Growth performance, photosynthetic status and bioaccumulation of heavy metals by Paulownia tomentosa (Thunb.) Steud growing on contaminated soils

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