Seasonal distribution and activity of nitrogen-cycling bacteria in Bardawil Lagoon, Egypt

Dewedar, Ahmed; Bahgat, M.; Shabana, E E

doi:10.2989/ajas.2009.34.2.9.896

Cited by 6 publications

(2 citation statements)

References 22 publications

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“…The "rhizosphere effect" can lead to greatly variations in compositions and diversities of rhizosphere and nonrhizosphere sediment bacteria, where the impacts were influenced by seasons (Dewedar et al, 2009), soil types (Zhao et al, 2017), and plant species (Yin et al, 2018). The OTU numbers in the rhizosphere sediments of five microcosms were all higher than those of their counterparts in the non-rhizosphere, suggesting the presence of more bacteria and more complex microbial communities in the rhizosphere sediments.…”

Section: Comparison Of Microbial Community Structure and Diversity Between Rhizosphere And Non-rhizosphere Bacteriamentioning

confidence: 99%

Response of Sediment Microbial Communities to the Rural Wastewater in the Pond-Ditch Circulation System

Pan

Liu

et al. 2021

Front. Environ. Sci.

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Microorganisms played important roles in nutrient removal in Pond-ditch circulation system (PDCS). However, dynamics of microbial community in the PDCS, and responses of rhizosphere and non-rhizosphere microbial community to rural wastewater remains unclear. In this paper, average operational taxonomic units numbers of sediment microbial varied from 10,254 to 17,112, and values in rhizosphere were higher than those of the non-rhizosphere (p < 0.05). Bacillus, Clostridium sensu stricto 1, and Geobacter were the predominant genera in PDCS sediment with relative abundances of 0.52–17.61%, 0.26–8.08%, and 0.20–4.58%, respectively. However, Bacillus, Clostridium sensu stricto 1, and Geobacter genera in rhizosphere were more abundant than those in non-rhizosphere at day 30. Chao 1 index ranged from 10,225 to 17,033 and showed significant positive correlations with all sediment properties (p < 0.05). Chao 1 and Shannon indices in rhizosphere were significant positively related to tartaric acid and total organic carbon, respectively; while significant correlation between Shannon and Simpson indices in non-rhizosphere and oxidation-reduction potential were detected (p < 0.05). Redundancy analysis suggested that lactic acids, proteins, and amino acids had strong positive effects on Geobacter and Clostridiu sensu stricto 12 in the rhizosphere; while Bacillus and Clostridium in non-rhizosphere were significantly affected by sediment ammonia nitrogen and nitrate nitrogen. Environmental variables accounted for 66.9 and 60.3% of the total variation for the microbial community of non-rhizosphere and rhizosphere sediments, respectively. Our results highlight that root exudates and sediment available N alter predominant genera in the rhizosphere and non-rhizosphere, respectively, which is benefit for optimizing removal efficiency of PDCSs in large-scale applications.

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Section: Comparison Of Microbial Community Structure and Diversity Between Rhizosphere And Non-rhizosphere Bacteriamentioning

confidence: 99%

Response of Sediment Microbial Communities to the Rural Wastewater in the Pond-Ditch Circulation System

Pan

Liu

et al. 2021

Front. Environ. Sci.

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“…The microbial community in the plant rhizospheres can vary with the plant species, seasons and waterbody or soil types (Dewedar et al, 2009;Herrmann et al, 2009;Hou et al, 2015;Yin et al, 2018;Zhao et al, 2017). There are some studies showing that root exudates could inhibit the activities of microorganisms.…”

Section: Sediments 1 Introductionmentioning

confidence: 99%

The abundance of nirS-type denitrifiers and anammox bacteria in rhizospheres was affected by the organic acids secreted from roots of submerged macrophytes

et al. 2020

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The abundance of nirS-type denitrifiers and anammox bacteria in rhizospheres were affected by the organic acids secreted from roots of submerged macrophytes Abstract：Excessive nitrogen has been a global concern to cause lake eutrophication. The denitrification and anammox processes are considered to be effective biological pathways for nitrogen removal.Submerged macrophytes also play a key role in the nitrogen cycle of lakes. However, the mechanism of submerged macrophytes on regulating biological nitrogen removal pathways has not been well quantified.Therefore, this study investigated the impacts of submerged macrophytes on the community structures and abundance of the nirS-type denitrifiers and anammox bacteria in the rhizospheres. The qPCR results indicated that the abundance of two bacteria in the near-rhizospheres of submerged macrophytes were significantly lower than the root compartments and non-rhizospheres, while the concentrations of organic acids in the near-rhizospheres were higher than those of the root compartments and non-rhizospheres.The RDA results illustrated that concentrations of NO3 --N, NO2 --N, citric acid and oxalic acid were the key environmental indicators which had the significant impact on the microbial community. The concentrations of citric acid and oxalic acid were negatively correlated with the nirS-type denitrifiers abundance, and the oxalic acid concentrations were negatively correlated with the anammox bacteria abundance. These results indicated that submerged macrophytes could reduce the abundance of nirS-type denitrifiers and anammox bacteria by releasing organic acids. In addition, the highest diversity of denitrifier community were found in the rhizosphere of the Hydrilla verticillata, while the highest diversity of anammox community were found in the Potamogeton maackianus rhizosphere. These results indicate that the impacts of submerged macrophytes on the biological nitrogen removal pathways were species-dependent.

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Effects of macrophyte-associated nitrogen cycling bacteria on denitrification in the sediments of the eutrophic Gonghu Bay, Taihu Lake

Wang

Zhou

et al. 2012

Hydrobiologia

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Seasonal distribution and activity of nitrogen-cycling bacteria in Bardawil Lagoon, Egypt

Cited by 6 publications

References 22 publications

Response of Sediment Microbial Communities to the Rural Wastewater in the Pond-Ditch Circulation System

Response of Sediment Microbial Communities to the Rural Wastewater in the Pond-Ditch Circulation System

The abundance of nirS-type denitrifiers and anammox bacteria in rhizospheres was affected by the organic acids secreted from roots of submerged macrophytes

Effects of macrophyte-associated nitrogen cycling bacteria on denitrification in the sediments of the eutrophic Gonghu Bay, Taihu Lake

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