Structure of Bacterial Communities Associated with Some Aquatic Plants

Abstract

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.