Contrasting Patterns of the Resident and Active Rhizosphere Bacterial Communities of Phragmites Australis

Zhou, Qing; He, Rujia; Zhao, Dayong; Zeng, Jin; Yu, Zhigang; Wu, Qinglong L.

doi:10.1007/s00248-021-01767-y

Cited by 5 publications

(3 citation statements)

References 77 publications

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“…Consistent with our previous findings, higher alpha diversity (species richness) of the bacterial community was observed in the rhizosphere sediments of P . australis as compared to bulk sediment samples (He et al, 2020; Huang et al, 2020; Zhou et al, 2021). This could be attributed to the fact that the rhizosphere provides more suitable living conditions for bacteria than bulk sediment, such as higher nutrient availability and weaker environmental stress.…”

Section: Discussionmentioning

confidence: 99%

Decreased spatial variation and deterministic processes of bacterial community assembly in the rhizosphere of Phragmites australis across the Middle–Lower Yangtze plain

Zeng

Zhao

et al. 2021

Molecular Ecology

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Comparison of the spatial distribution and assembly processes between bulk and rhizosphere bacterial communities at multiple spatial scales is vital for understanding the generation and maintenance of microbial diversity under the influence of plants. However, biogeographical patterns and the underlying mechanisms of microbial communities in bulk and rhizosphere sediments of aquatic ecosystems remain unclear. Here, we collected 140 bulk and rhizosphere sediment samples of Phragmites australis from 14 lakeshore zones across a 510‐km transect in the Middle–Lower Yangtze plain. We performed high‐throughput sequencing to investigate the bacterial diversity, composition, spatial distribution and assembly processes of these samples. Bacterial communities in the rhizosphere sediment exhibited higher alpha diversity but lower beta diversity than those in the bulk sediment. Both bulk and rhizosphere sediment bacterial communities had significant distance–decay relationships, but spatial turnover of the rhizosphere sediment bacterial community was strikingly lower than that of bulk sediment. Despite variable selection dominating the assembly processes of bacterial communities in bulk sediment, the rhizosphere of P. australis enhanced the role of dispersal limitation in governing bacterial communities. The relative importance of different ecological processes in determining bacterial assembly presented distinct patterns of increasing or decreasing linearly with an increase of scale. This investigation highlights the convergent selection of the aquatic plant rhizosphere for surrounding bacterial communities and emphasizes the importance of different ecological processes on bacterial community assembly in sediment environments over different scales. Furthermore, we provide a preliminary framework for exploring the scale dependence of microbial community assembly in aquatic ecosystems.

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Section: Discussionmentioning

confidence: 99%

Decreased spatial variation and deterministic processes of bacterial community assembly in the rhizosphere of Phragmites australis across the Middle–Lower Yangtze plain

Zeng

Zhao

et al. 2021

Molecular Ecology

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“…Moreover, alpha diversity of bacterial communities observed in non-rhizosphere sediments was significantly higher than that in rhizosphere sediments ( Figure 3 ), which indicates that different root zones have certain effects on microbial diversity. Zhou et al (2022) also reported that habitat (rhizosphere or bulk) accounted for the greatest amount of variation in bacterial community composition, overriding the importance of environmental interference (such as seasonal and flooding conditions) on these bacterial communities. In our study, the main factors causing the differences of microbial diversity in rhizosphere and non-rhizosphere sediments may be the antibiotics mentioned above and the physicochemical properties of sediments, which could change bacterial community diversity ( Zhang et al, 2022 ).…”

Section: Discussionmentioning

confidence: 99%

Characterizing bacterial communities in Phragmites australis rhizosphere and non-rhizosphere sediments under pressure of antibiotics in a shallow lake

et al. 2022

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IntroductionAntibiotics are ubiquitous pollutants and widely found in aquatic ecosystems, which of rhizosphere sediment and rhizosphere bacterial communities had certain correlation. However, the response of bacterial communities in Phragmites australis rhizosphere and non-rhizosphere sediments to antibiotics stress is still poorly understood.MethodsTo address this knowledge gap, the samples of rhizosphere (R) and non-rhizosphere (NR) sediments of P. australis were collected to investigate the differences of bacterial communities under the influence of antibiotics and key bacterial species and dominate environmental factors in Baiyangdian (BYD) Lake.ResultsThe results showed that the contents of norfloxacin (NOR), ciprofloxacin (CIP) and total antibiotics in rhizosphere sediments were significantly higher than that in non-rhizosphere sediments, meanwhile, bacterial communities in non-rhizosphere sediments had significantly higher diversity (Sobs, Shannon, Simpsoneven and PD) than those in rhizosphere sediments. Furthermore, total antibiotics and CIP were found to be the most important factors in bacterial diversity. The majority of the phyla in rhizosphere sediments were Firmicutes, Proteobacteria and Campilobacterota, while Proteobacteria, Chloroflexi was the most abundant phyla followed by Bacteroidota, Actinobacteriota in non-rhizosphere sediments. The dominate factors of shaping the bacterial communities in rhizosphere were total antibiotics, pH, sediment organic matter (SOM), and NH4-N, while dissolved organic carbon (DOC), NO3-N, pH, and water contents (WC) in non-rhizosphere sediments.DiscussionIt is suggested that antibiotics may have a substantial effect on bacterial communities in P. australis rhizosphere sediment, which showed potential risk for ARGs selection pressure and dissemination in shallow lake ecosystems.

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“…Microbial community succession has been observed in the rhizosphere and endosphere of Typha orientalis at different plant developmental stages (Wang et al 2023 ), coinciding with seasonal (temperature) and environmental (ammonium, nitrogen, total sulfur, among others) changes in natural wetlands. Seasonal variations of plant-associated microbial community composition in other aquatic macrophytes ( Phragmites australis ) are a common response in natural environments (Zhou et al 2021 ). However, the nature and the extent of the influence of seasonal and successional changes on plant-microbe interactions in NA dissipation remains unexplored.…”

Section: Plant-microbe Interactions In the Degradation Of Nas And The...mentioning

confidence: 99%

Microbial degradation of naphthenic acids using constructed wetland treatment systems: metabolic and genomic insights for improved bioremediation of process-affected water

Reis,

Correa-Garcia,

Tremblay

et al. 2023

FEMS Microbiology Ecology

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Naphthenic acids (NAs) are a complex mixture of organic compounds released during bitumen extraction from mined oil sands that are important contaminants of oil sands process-affected water (OSPW). NAs can be toxic to aquatic organisms and, therefore, are a main target compound for OSPW. The ability of microorganisms to degrade NAs can be exploited for bioremediation of OSPW using constructed wetland treatment systems (CWTS), which represent a possible low energy and low-cost option for scalable in situ NA removal. Recent advances in genomics and analytical chemistry have provided insights into a better understanding of the metabolic pathways and genes involved in NA degradation. Here, we discuss the ecology of microbial NA degradation with a focus on CWTS and summarize the current knowledge related to the metabolic pathways and genes used by microorganisms to degrade NAs. Evidence to date suggests that NAs are mostly degraded aerobically through ring cleavage via the beta-oxidation pathway, which can be combined with other steps such as aromatization, alpha-oxidation, omega-oxidation, or activation as coenzyme A (CoA) thioesters. Anaerobic NA degradation has also been reported via the production of benzoyl-CoA as an intermediate and/or through the involvement of methanogens or nitrate, sulfate, and iron reducers. Furthermore, we discuss how genomic, statistical, and modeling tools can assist in the development of improved bioremediation practices.

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Contrasting Patterns of the Resident and Active Rhizosphere Bacterial Communities of Phragmites Australis

Cited by 5 publications

References 77 publications

Decreased spatial variation and deterministic processes of bacterial community assembly in the rhizosphere of Phragmites australis across the Middle–Lower Yangtze plain

Decreased spatial variation and deterministic processes of bacterial community assembly in the rhizosphere of Phragmites australis across the Middle–Lower Yangtze plain

Characterizing bacterial communities in Phragmites australis rhizosphere and non-rhizosphere sediments under pressure of antibiotics in a shallow lake

Microbial degradation of naphthenic acids using constructed wetland treatment systems: metabolic and genomic insights for improved bioremediation of process-affected water

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