الفهرس 
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Abstract
The ability of (Conyza dioscoridis L. Desf.) to accumulate and translocate aluminium Al), cadmium (Cd), chromium (Cr), copper (Cu), iron (Fe), manganese (Mn), nickel (Ni) and zinc (Zn) was studied in the Ismailia Canal, Northern Egypt. Water, sediment and plant samples were collected in the autumn, winter, spring and summer seasons of 2012/2013 from three different sectors of Ismailia Canal. The selected sectors include Fum Ismailia Canal (FIC) – as a control (1), Shubra-El-Khema area (SIC) – impacted by municipal outlets (2) and Musturod area (MIC) – impacted by industrial outlets (3). The contents of metals in shoots
and roots, the bioconcentration factor (BF) and translocation factor (TF) were the parameters used to evaluate the efficiency of studied plant according to the phytoremediation criteria. Generally, the trend of metal accumulation by Conyza dioscoridis plants was: Fe > Cu > Al> Ni > Zn > Mn > Cr > Cd in both shoots and roots, and the higher contents were found in the
roots. The maximum mean concentrations in the roots tissue were found for Fe (2273.5), Cu (1906.3) Al (1652.5) Ni (286.5) Zn (764.7) Mn (1429.3) Cr (18.2) Cd (18.2) mg kg-1 dry weight, respectively, in SIC sector. Translocation capability of studied heavy metals was in
the order of Ni > Al > Cr ≥ Fe > Zn > Cu > Cd > Mn. The TF values suggested the
occurrence of an avoidance strategy of plants that, under relatively high heavy metals concentration, accumulate these metals in roots thus reducing their translocation. Howeverو Conyza dioscoridis behaved as tolerant plants with considerable capacity of rhizofiltration.
This study shows Conyza dioscoridis to be a promising candidate for phytoremediation of wastewater polluted with heavy metals.