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The current study was conducted to determine the effect of crude oil on the pigments and protein content of Hydrilla verticillata plant from December 2018 to February 2019. Hydrilla verticillata was exposed to different concentrations of treatments (0.01,0.05,0.10,0.20) % of crude oil for 24 days. The pigments content was evaluated as total chlorophyll, a, b, carotene and protein content within plant tissues during the days (1, 8, 16 and 24).      The results of this study showed an increment in the total chlorophyll values of plant, which is exposed to different concentrations of crude oil compared to the control treatment during the first day of the experiment and decreased compared to control treatment during 8,16 and 24 days of the experiment. The recorded maximum value of total chlorophyll was (29.49) μg / g at 0.10% treatment during the first day and the statistical analysis showed significant differences below the probability level (P> 0.05) between the concentrations and the days of the experiment. Chlorophyll a, b and carotene of plant exhibit the overall trend of total chlorophyll. The values of chlorophyll b were higher than the values of chlorophyll and carotene.      The current study showed a gradual decrease in the total protein values of plants in crude oil during experiential period compared to control treatment, recording the highest values at the 0.01% during the first day (29.4 mg/g) and the lowest in the concentration of 0.05% during the day 24 was (3.5) mg / g, and the statistical analysis showed significant differences below the probability level (P> 0.05) between the days and concentrations of the experiment. The study concluded that a gradual decrease of total chlorophyll values during period experimental, recorded the chlorophyll b values higher compare to chlorophyll a and carotene. the gradual decrease of protein values with the increasing the concentration.

This study was the first of its kind on the Euphrates river in Iraq to study of the composition of the epiphytic bacterial community of an three aquatic plants (Hydrilla verticillata, Phragmitesaustralis and Eichhorniacrassipes) was investigated. The study was conducted to how are bacterial assemblages in the rhizosphere for sediment different from those in bulk and surface sediments and aquatic plant during 2020 two sites in Kufa river were chosen. Total organic material, pH and EC of sediment were measured. Eighteen taxon were found in current study. The bacterial communities on three aquatic plants were distinct, such that Aeromonassobria, Pseudomonas putida, Enterobactercloacae andAcinetobacterbaumanniiwere found on H.verticillata and in the sediment, while Acinetobacterlwoffii, Enterobacter cloacae ssp cloacae, Escherichia coli and klebsiellapneumoniaessp pneumonia on E. crassipes in site 2. Either on P. australisand sediment the Enterobactercloacae, Pseudomonas aeruginosa, and Pseudomonas putida were found in site 1 and Granulicatellaelegans, Proteus penneri, and Pseudomonas putida in site 2. While the Escherichia coli, Klebsiella pneumonia andSerratiamarcescens were found in water at site 1.Aeromonassobriadominance in sediment of H. verticillata while Escherichia colidominance in sediment of E. crassipes, eitherPseudomonas putidawas dominanced inP. australisroot. Number of bacteria were recorded in sediment of P. australis higher proportion was 28% than other. The indexes of diversity were recorded in sediment of P. australis higher than other except Domancy index recorded in sediment of E.crassipes was 0.025 higher than other. Our results indicated differences between the epiphyticbacterial community on the three plants and the water column at the species level, but an even representation of the mostabundant phylogenetic taxa in sediment of P. australis was revealed. Statistical comparison of the retrieved sequencesconfirmed that the three libraries did differ significantly at the community level.

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