Structural and metabolic diversity of rhizosphere microbial communities of Phragmites karka in a tropical coastal lagoon

Behera, Pratiksha; Mohapatra, Madhusmita Mohanty; Adhya, T. K.; Suar, Mrutyunjay; Pattnaik, Ajit K.; Rastogi, Gurdeep

doi:10.1016/j.apsoil.2017.12.023

Cited by 29 publications

(8 citation statements)

References 56 publications

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“…The strain collection obtained from P. australis rhizosphere in this study was dominated by Firmicutes (57% of the isolates), with a lower percentage of Proteobacteria and Bacteroidetes, that found a more suitable habitat in the plant endosphere, and Actinobacteria , that conversely were not isolated from the endosphere fraction. Previous studies, in contrast with our results, by applying cultivation-independent Next Generation Sequencing approaches retrieved in the rhizosphere of P. australis the dominance of the phylum Proteobacteria [50,51,52]. The dominance of Firmicutes in our collection could be a cultivation-related bias, although we have to consider that the plant species is not the only factor that modulates the bacterial community structure in the root apparatus, acting together with different abiotic factors [53] and making reasonable that the rhizosphere community of P. australis collected from CW systems treating different wastewaters hosts specific peculiar gram positive taxa.…”

Section: Discussioncontrasting

confidence: 99%

Root Bacteria Recruited by Phragmites australis in Constructed Wetlands Have the Potential to Enhance Azo-Dye Phytodepuration

et al. 2019

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The microbiome associated with plants used in phytodepuration systems can boost plant growth and services, especially in ecosystems dealing with recalcitrant compounds, hardly removed via traditional wastewater (WW) treatments, such as azo-dyes used in textile industry. In this context, we aimed to study the cultivable microbiome selected by Phragmites australis plants in a Constructed Wetland (CW) in Morocco, in order to obtain candidate inoculants for the phytodepuration of azo-dye contaminated WW. A collection of 152 rhizospheric and endophytic bacteria was established. The strains were phylogenetically identified and characterized for traits of interest in the phytodepuration context. All strains showed Plant Growth Promotion potential in vitro and 67% of them significantly improved the growth of a model plant in vivo compared to the non bacterized control plants. Moreover, most of the isolates were able to grow in presence of several model micropollutants typically found in WW, indicating their potential use in phytodepuration of a wide spectrum of effluents. The six most promising strains of the collection were tested in CW microcosms alone or as consortium: the consortium and two single inocula demonstrated to significantly increase the removal of the model azo-dye Reactive Black 5 compared to the non bacterized controls.

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Section: Discussioncontrasting

confidence: 99%

Root Bacteria Recruited by Phragmites australis in Constructed Wetlands Have the Potential to Enhance Azo-Dye Phytodepuration

et al. 2019

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“…Proteobacteria was the most dominant phylum occupying the absolute dominance in the five groups of CWs. This result was similar to that of previous studies [42,43]. As shown in Figure 6c, the difference in season had a certain effect on bacterial diversity.…”

Section: Bacterial Community At the Phylum Level In Both Seasons And ...supporting

confidence: 92%

Purification Effects on β-HCH Removal and Bacterial Community Differences of Vertical-Flow Constructed Wetlands with Different Vegetation Plantations

et al. 2021

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This study aimed to investigate the removal of β-hexachlorocyclohexane (β-HCH) at realistic concentration levels (10 µg/L) in different plant species in constructed wetlands (Acorus calamus, Canna indica, Thalia dealbata, and Pontederia cordata) and the structure of the rhizosphere microbial community response of each group during summer and winter. Results showed that all groups of constructed wetlands had very good decontamination efficiency against β-HCH in water (90.86–98.17%). The species that most efficiently purified β-HCH in water was A. calamus in summer (98.17%) and C. indica in winter (96.64%). Substrate sorption was found to be the major pathway for β-HCH removal from water in the constructed wetlands. The ability of the wetland plants to absorb and purify β-HCH was limited, and C. indica had the strongest absorptive capacity among the four plant species. The mean β-HCH removal from the matrix of the planted plants increased by 5.8% compared with that of the control treatment (unplanted plants). The average β-HCH content in the plant rhizosphere substrate was 4.15 µg/kg lower than that in the non-rhizosphere substrate. High-throughput sequencing analysis revealed significant differences (P < 0.05) in the Chao1 and ACE indices of microbes in the substrate of four wetlands during summer and winter. At the genus level, the constructed wetlands with vegetation plantations showed higher microbial abundance than the constructed wetlands without vegetation plantations. In winter, the bacterial community structure of each constructed wetland was quite different, but no dominant flora in the bacterial community structure obviously changed. In summer, the bacterial community structure at the same stage was relatively small. The abundance of Actinobacteria and Sphingomonas remarkably increased over time in summer.

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“…Collectively, these correlations suggest that the bacterial community competes with the root bacterial community, but after a sufficiently long period of stable conditions, the bacterial community structure reaches a steady state, as has been suggested previously (Goberna et al, 2016). The root system supports the coexistence of a large number of symbiotic bacteria and serves as an important vehicle for material exchange and signaling between plants and the soil, which is an important way for plants to respond to external stresses (Behera et al, 2018; Wu et al, 2014). In the restored wetlands that we examined, the prevalence of species within the phylum Rhizobiaceae significantly increased from the 3‐year site to the 11‐year site.…”

Section: Discussionmentioning

confidence: 99%

“…Root secretions can initiate and regulate the interaction between endophytic root bacteria and soil bacteria (Zhou et al, 2017). The root system supports the coexistence of a large number of symbiotic bacteria and serves as an important vehicle for material exchange and signaling between plants and the soil, which is an important way that plants can respond to external stresses (Behera et al, 2018; Wu et al, 2014). Previous studies have demonstrated that endophytic and rhizobacterial communities of plants are involved in disease control, nutrient acquisition, and enhancing the habitat‐adaptive fitness of the plants (Mario et al, 2004; Prashar et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Changes of bacterial communities in restored Phragmites australis wetlands indicate the improvement of soil in the Yellow River Delta

Gao

McClellan

et al. 2023

Land Degrad Dev

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With increasing global awareness of the ecological services that wetlands can provide, an increased emphasis has been placed on the need for wetland restoration projects. Among the types of wetland restoration projects that have been initiated are those that aim to return farmlands back to their previous wetland state to restore wetland vegetation and regain the ecological services that had been lost. However, studies on the changes of belowground bacterial diversities following the conversion of farmlands back to wetlands are rare, especially in coastal areas. In the present study, we examined the soil characteristics and the microbial diversity of the soil and roots across Phragmites australis–dominated coastal marshes within the Yellow River Delta. We sampled two marshes that had been restored 11 and 3 years prior to sampling (11‐year site and 3‐year site, respectively). We also sampled two additional, undisturbed wetlands—one within the new Yellow River course (NC site), and the other within the abandoned Yellow River course (OC site)—to serve as controls to assess the effectiveness of the wetland restoration project. Specifically, we measured the concentrations of nutrients and organic matter in the soil, the activities of the enzymes urease, sucrase, and alkaline phosphatase in the soil, and the diversity of the microbial communities in the soil and roots. The results showed that the concentrations of soil nutrients and the activities of the soil enzymes were significantly greater in the 11‐year site compared to the 3‐year site but were similar between the 11‐year site and the NC site. Shannon, Simpson, and Pielou indices of diversity among the soil bacteria were positively correlated with the concentrations of soil nutrients and the activities of the soil enzymes, which were generally lowest in the 3‐year site compared to the other study sites. The diversity indices among the root bacteria, however, did not exhibit a similar trend. The bacterial community composition of the soil and roots differed between sites. The relative abundance of Firmicutes in the soil and roots was highest in the 3‐year site compared to the 11‐year, NC, and OC sites. The relative abundance of soil Bacteroidetes was higher in the soils of the NC and OC sites compared to in those of the restoration sites. Overall, the diversity richness of the subsurface bacterial communities increased with the time since the restoration of these wetlands, and after 11 years post‐restoration, appeared to resemble those of the natural wetlands of the area. Our results therefore imply that future assessments of coastal wetland restoration projects could be made based in part on soil nutrient concentrations, enzyme activities, and the microbial diversity of the soil and plant roots within these systems.

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Structural and metabolic diversity of rhizosphere microbial communities of Phragmites karka in a tropical coastal lagoon

Cited by 29 publications

References 56 publications

Root Bacteria Recruited by Phragmites australis in Constructed Wetlands Have the Potential to Enhance Azo-Dye Phytodepuration

Root Bacteria Recruited by Phragmites australis in Constructed Wetlands Have the Potential to Enhance Azo-Dye Phytodepuration

Purification Effects on β-HCH Removal and Bacterial Community Differences of Vertical-Flow Constructed Wetlands with Different Vegetation Plantations

Changes of bacterial communities in restored Phragmites australis wetlands indicate the improvement of soil in the Yellow River Delta

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