The composition, biotic network, and assembly of plastisphere protistan taxonomic and functional communities in plastic-mulching croplands

Li, Yongbin; Yang, Rui; Guo, Lifang; Gao, Wenlong; Su, Pingzhou; Xu, Zhimin; Xiao, Huan; Ma, Zhijun; Liu, Xiang; Gao, Pin; Li, Baoqin; Sun, Xiaoxu; Yan, Geng; Sun, Weimin

doi:10.1016/j.jhazmat.2022.128390

Cited by 57 publications

(10 citation statements)

References 70 publications

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“…The niche breadth and generalist/specialist species were calculated based on the previous descriptions. − The generalist species can thrive in a wide range of environmental conditions and utilize a variety of different resources. However, specialist species are able to only thrive in a limited range of environmental conditions or have a narrow diet. , The interactions of ″microbe–microbe″ and ″environment–microbe″ were analyzed using a co-occurrence network. , A connected link denotes a high and significant Spearman’s correlation between variables. The size of each node is positively related to the count of connections–degree.…”

Section: Methodsmentioning

confidence: 99%

Primary Succession Changes the Composition and Functioning of the Protist Community on Mine Tailings, Especially Phototrophic Protists

Gao

Sun

et al. 2022

ACS Environ. Au

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Primary succession in mine tailings is a prerequisite for tailing vegetation. Microorganisms, including bacteria, fungi, and protists, play an important role in this process in the driving force for improving the nutritional status. Compared to bacteria and fungi, protist populations have rarely been investigated regarding their role in mine tailings, especially for those inhabiting tailings associated with primary succession. Protists are the primary consumers of fungi and bacteria, and their predatory actions promote the release of nutrients immobilized in the microbial biomass, as well as the uptake and turnover of nutrients, affecting the functions of the wider ecosystems. In this study, three different types of mine tailings associated with three successional stages (original tailings, biological crusts, and Miscanthus sinensis grasslands) were selected to characterize the protistan community diversity, structure, and function during primary succession. Some members classified as consumers dominated the network of microbial communities in the tailings, especially in the original bare land tailings. The keystone phototrophs of Chlorophyceae and Trebouxiophyceae showed the highest relative abundance in the biological crusts and grassland rhizosphere, respectively. In addition, the co-occurrences between protist and bacterial taxa demonstrated that the proportion of protistan phototrophs gradually increased during primary succession. Further, the metagenomic analysis of protistan metabolic potential showed that abundances of many functional genes associated with photosynthesis increased during the primary succession of tailings. Overall, these results suggest that the primary succession of mine tailings drives the changes observed in the protistan community, and in turn, the protistan phototrophs facilitate the primary succession of tailings. This research offers an initial insight into the changes in biodiversity, structure, and function of the protistan community during ecological succession on tailings.

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Section: Methodsmentioning

confidence: 99%

Primary Succession Changes the Composition and Functioning of the Protist Community on Mine Tailings, Especially Phototrophic Protists

Gao

Sun

et al. 2022

ACS Environ. Au

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“…The last wash was spread on LB gar plates to check whether microorganisms were removed [ 35 ]. Then, root samples were ground with liquid N, and DNA was extracted with a DNeasy Powersoil kit [ 36 ] according to the manufacturer's protocol (QIAGEN, Dresden, Germany). The quality and quantity of DNA were examined by the NanoDrop 2000 spectrophotometer (Thermo Fisher Scientific, Waltham, MA, USA).…”

Section: Methodsmentioning

confidence: 99%

Characterization of diazotrophic root endophytes in Chinese silvergrass (Miscanthus sinensis)

Yang

Häggblom

et al. 2022

Microbiome

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Background Phytoremediation is a potentially cost-effective way to remediate highly contaminated mine tailing sites. However, nutrient limitations, especially the deficiency of nitrogen (N), can hinder the growth of plants and impair the phytoremediation of mine tailings. Nevertheless, pioneer plants can successfully colonize mine tailings and exhibit potential for tailing phytoremediation. Diazotrophs, especially diazotrophic endophytes, can promote the growth of their host plants. This was tested in a mine-tailing habitat by a combination of field sampling, DNA-stable isotope probing (SIP) analysis, and pot experiments. Results Bacteria belonging to the genera Herbaspirillum, Rhizobium, Devosia, Pseudomonas, Microbacterium, and Delftia are crucial endophytes for Chinese silvergrass (Miscanthus sinensis) grown in the tailing, the model pioneer plant selected in this study. Further, DNA-SIP using 15N2 identified Pseudomonas, Rhizobium, and Exiguobacterium as putative diazotrophic endophytes of M. sinensis. Metagenomic-binning suggested that these bacteria contained essential genes for nitrogen fixation and plant growth promotion. Finally, two diazotrophic endophytes Rhizobium sp. G-14 and Pseudomonas sp. Y-5 were isolated from M. sinensis. Inoculation of another pioneer plant in mine tailings, Bidens pilosa, with diazotrophic endophytes resulted in successful plant colonization, significantly increased nitrogen fixation activity, and promotion of plant growth. Conclusions This study indicated that diazotrophic endophytes have the potential to promote the growth of pioneer plant B. pilosa in mine tailings.

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“…58 In addition, bacteria affiliated with Fimbriimonadaceae were found to be predominant in groundwater where As(III) oxidation was highly active. 59,60 Co-occurrence network analysis showed positive correlations between these two bacteria and aioA gene abundance and MAGs associated with Myxococcus and Fimbriimonadaceae contained aioA genes, suggesting their potential for As(III) oxidation. Genes associated with denitrification were also detected in these MAGs.…”

Section: ■ Resultsmentioning

confidence: 98%

Immobile Iron-Rich Particles Promote Arsenic Retention and Regulate Arsenic Biotransformation in Treatment Wetlands

Liu

Häggblom

et al. 2022

Environ. Sci. Technol.

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Remediation of arsenic (As)-contaminated wastewater by treatment wetlands (TWs) remains a technological challenge due to the low As adsorption capacity of wetland substrates and the release of adsorbed As to pore water. This study investigated the feasibility of using immobile iron-rich particles (IIRP) to promote As retention and to regulate As biotransformation in TWs. Iron-rich particles prepared were immobilized in the interspace of a gravel substrate. TWs with IIRP amendment (IIRP-TWs) achieved a stable As removal efficiency of 63 ± 4% over 300 days, while no As removal or release was observed in TWs without IIRP after 180 days of continuous operation. IIRP amendment provided additional adsorption sites and increased the stability of adsorbed As due to the strong binding affinity between As and Fe oxides. Microbially mediated As(III) oxidation was intensified by iron-rich particles in the anaerobic bottom layer of IIRP-TWs. Myxococcus and Fimbriimonadaceae were identified as As(III) oxidizers. Further, metagenomic binning suggested that these two bacterial taxa may have the capability for anaerobic As(III) oxidation. Overall, this study demonstrated that abiotic and biotic effects of IIRP contribute to As retention in TWs and provided insights into the role of IIRP for the remediation of As contamination.

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The composition, biotic network, and assembly of plastisphere protistan taxonomic and functional communities in plastic-mulching croplands

Cited by 57 publications

References 70 publications

Primary Succession Changes the Composition and Functioning of the Protist Community on Mine Tailings, Especially Phototrophic Protists

Primary Succession Changes the Composition and Functioning of the Protist Community on Mine Tailings, Especially Phototrophic Protists

Characterization of diazotrophic root endophytes in Chinese silvergrass (Miscanthus sinensis)

Immobile Iron-Rich Particles Promote Arsenic Retention and Regulate Arsenic Biotransformation in Treatment Wetlands

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