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• W2550242593 abstract "During a scientific visit to a coastal area at Suez, Egypt, it was observed that Tamarix nilotica plant naturally dominated on oil polluted site in this area, indicating that this plant is a tolerant of the combined adverse effects of salinity and petroleum pollutants. This observation stimulated a study to investigate the rhizosphere effect of this plant on the degradation and removal of petroleum aromatic hydrocarbons (PAH) compounds from this coastal saline soil. Accordingly, samples were collected from the rhizosphere and from the non-rhizosphere soil and studied. The results show that the rhizosphere soil of Tamarix nilotica was rich in total heterotrophic bacteria and oil-degraders. In the rhizosphere soil oil-degraders were of higher percentage (30.7%) compared to the non- rhizosphere soil (4.6%). Residual total petroleum hydrocarbons (TPH) in the non-rizosphere soil was 2.25% (w/w), while in the rhizosphere soil the percentage was 0.9% (w/w). This indicate a reduction of 60% of the TPHs. The saturates fraction in the rhizosphere as compared to the non-rizosphere soil was reduced by 87.5%, while the aromatics were reduced by 60.7%. It is of interest to find that the non-degradable asphaltenes and resins were reduced in the rhizosphere by 1.1% and 2.5% respectively. As a total the amount of PAHs (mgkg -1 soil) were 1073.5 and 541.94 in the non-rhizosphere and rhizosphere soil respectively, i.e. with a loss of 49.5% in the rhizosphere. Chrysene and dibenzo(ah)anthracene as compared to the other PAHs were more frequent in the non-rhizosphere soil. These two compounds were reduced by 55.7% and 24.3% respectively in the rhizosphere. As a total the four- ringed PAHs as compared to other PAH groups were highly reduced (60.3%) in the rhizosphere, this was followed by the three-ringed PAH group (52.5%). The five-ringed and the six-ringed groups were weakly reduced (37.8% and 33.8% respectively). The 8 carcinogenic PAH group were collectively reduced in the rhizosphere by 49.1%. A particular notable distinction of the rhizosphere of Tamarix nilotica is the greater efficiency to degrade the carcinogenic PAH compounds especially flouranthene (75.4%), benzo(a)anthracene (63.4%) and pyrene (60.2%). Results of Gas Chromatography (GC) analysis for the detection of the accumulated PAHs in the shoot tissue of Tamarix nilotica plant growing in the polluted area as compared to that growing in non-polluted area show that the identified peaks in the tissue of both plants were 15 and 14 peaks respectively. The sum of the 15 PAHs was 528 mgkg -1 dried tissue, whereas the sum of the 14 PAHs was 769 mgkg -1 dried soil. This result indicate an" @default.
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• W2550242593 date "2011-01-01" @default.
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• W2550242593 title "Biodegradation of PAH Compounds in the Rhizosphere of Tamarix nilotica: A Salt tolerant wild plant" @default.
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