Rhizosphere microbial community composition and survival strategies in oligotrophic and metal(loid) contaminated iron tailings areas

Geng, Huanhuan; Wang, Fei; Yan, Changchun; Ma, Shaoping; Zhang, Yiyue; Qin, Qizheng; ZhiJun, Tian; Liu, Ruiping; Chen, Huilun; Zhou, Beihai; Yuan, Rongfang

doi:10.1016/j.jhazmat.2022.129045

Cited by 45 publications

(8 citation statements)

References 72 publications

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“…There has been substantial discussion on the interactions occurring among natural populations of rhizosphere microbes (G omez-Aparicio et al, 2022;Ren et al, 2015). This study provides novel evidence on how long-term natural saline-alkaline stress in the field recruits the rhizosphere soil microbial community of L. chinensis.…”

Section: Response Strategies Of Bacteria and Amf Communities To Salin...mentioning

confidence: 85%

“…This is consistent with the previous research results on microbial communities in natural salt–alkali environments (Ibekwe et al, 2017; Neubauer et al, 2018; P. Singh et al, 2021). Remarkable changes in the composition, diversity, and structure of bacteria and AMF are specific adaptation strategies evolved by rhizosphere microorganisms under saline–alkaline conditions (Geng et al, 2022; Tiwari et al, 2022).…”

Section: Discussionmentioning

confidence: 99%

“…Singh et al, 2021). Remarkable changes in the composition, diversity, and structure of bacteria and AMF are specific adaptation strategies evolved by rhizosphere microorganisms under saline-alkaline conditions (Geng et al, 2022;Tiwari et al, 2022).…”

Section: Keystone Species Critical To Plant Nutrients and Growthmentioning

confidence: 99%

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Microbial community in the Leymus chinensis rhizosphere associates with its high production in mild saline–alkaline grassland

Guo,

Hao

et al. 2023

Land Degrad Dev

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Leymus chinensis is a dominant grass widely distributed in Central Asia, in both saline−alkaline and non‐saline−alkaline grasslands. However, the mechanisms underlying its saline−alkaline tolerance have not been explored from the perspective of rhizosphere microbial communities. We investigated L. chinensis rhizosphere microbial communities in both saline–alkaline and non‐saline–alkaline grasslands. It was found that the biomass of L. chinensis was remarkably higher in saline–alkaline than in non‐saline–alkaline habitat and that changes in the rhizosphere bacterial and arbuscular mycorrhizal fungi (AMF) communities had a greater effect on biomass than climate, soil moisture, nutrients, and salinity. We demonstrated that the bacteria and AMF in the rhizosphere of L. chinensis grown in saline–alkaline grassland differed from those in non‐saline–alkaline grassland, and the differences were associated with soil salinity or alkalinity. The co‐occurrence networks of bacteria and AMF and bacteria–AMF interaction networks in rhizosphere were complex and connected, with more nodes and edges and a higher average degree of nodes and modularity in the saline–alkaline grassland. More complex networks promoted plant tolerance and growth under salt–alkali stress. High number of microbial keystone taxa was related to the nutrient concentration in the soil and L. chinensis leaves, and more remarkable direct effects of the bacterial and AMF keystone communities on plant nutrient concentrations were demonstrated in saline–alkaline grassland. This indicates that bacterial and AMF communities in saline–alkaline grasslands are favorable for plant growth and nutrient uptake. This study provides an accurate and beneficial source of soil microbial assemblages for future plant–microbial joint remediation of the saline–alkaline ecosystems.

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Section: Response Strategies Of Bacteria and Amf Communities To Salin...mentioning

confidence: 85%

Section: Discussionmentioning

confidence: 99%

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Microbial community in the Leymus chinensis rhizosphere associates with its high production in mild saline–alkaline grassland

Guo,

Hao

et al. 2023

Land Degrad Dev

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“…More importantly, the relative abundance of Streptomyces, Sphingomonas , Nocardioides , Bacillus , Gaiella , and Solirubrobacter was high in the Pb-contaminated rhizospheric soils inoculated with Hao 2018. Members of those genera were usually found to be metal-tolerant species and/or plant growth-promoting bacteria (PGPB) ( Tangaromsuk et al, 2002 ; Dimkpa et al, 2008 ; Rodríguez-Tirado et al, 2012 ; Khan et al, 2014 ; Mahbub et al, 2016 ; Tan et al, 2017 ; Kou et al, 2018 ; Wang et al, 2020 ; Geng et al, 2022 ). In particular, the genera Sphingomonas , Streptomyces , and Bacillus are both metal-immobilizing and plant growth-promoting ( So et al, 2001 ; Tangaromsuk et al, 2002 ; Dimkpa et al, 2008 ; Kumar et al, 2012 ; Rodríguez-Tirado et al, 2012 ; Khan et al, 2014 ; Tan et al, 2017 ).…”

Section: Discussionmentioning

confidence: 99%

Exopolysaccharide-producing bacteria enhanced Pb immobilization and influenced the microbiome composition in rhizosphere soil of pakchoi (Brassica chinensis L.)

Cao

Zhang²,

Ju³

et al. 2023

Front. Microbiol.

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Lead (Pb) contamination of planting soils is increasingly serious, leading to harmful effects on soil microflora and food safety. Exopolysaccharides (EPSs) are carbohydrate polymers produced and secreted by microorganisms, which are efficient biosorbent materials and has been widely used in wastewater treatment to remove heavy metals. However, the effects and underlying mechanism of EPS-producing marine bacteria on soil metal immobilization, plant growth and health remain unclear. The potential of Pseudoalteromonas agarivorans Hao 2018, a high EPS-producing marine bacterium, to produce EPS in soil filtrate, immobilize Pb, and inhibit its uptake by pakchoi (Brassica chinensis L.) was studied in this work. The effects of strain Hao 2018 on the biomass, quality, and rhizospheric soil bacterial community of pakchoi in Pb-contaminated soil were further investigated. The results showed that Hao 2018 reduced the Pb concentration in soil filtrate (16%–75%), and its EPS production increased in the presence of Pb2+. When compared to the control, Hao 2018 remarkably enhanced pakchoi biomass (10.3%–14.3%), decreased Pb content in edible tissues (14.5%–39.2%) and roots (41.3%–41.9%), and reduced the available Pb content (34.8%–38.1%) in the Pb-contaminated soil. Inoculation with Hao 2018 raised the pH of the soil, the activity of several enzymes (alkaline phosphatase, urease, and dehydrogenase), the nitrogen content (NH4+-N and NO3−-N), and the pakchoi quality (Vc and soluble protein content), while also raising the relative abundance of bacteria that promote plant growth and immobilize metals, such as Streptomyces and Sphingomonas. In conclusion, Hao 2018 reduced the available Pb in soil and pakchoi Pb absorption by increasing the pH and activity of multiple enzymes and regulating microbiome composition in rhizospheric soil.

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“…Microbes that tolerate PTEs contribute to plant survival and growth in the rhizosphere. For example, rhizobium represents bacteria that capture groups of plant rhizosphere with symbiotic nitrogen (N) fixation in soils (Visioli et al, 2015) and promote OM decomposition (Geng et al, 2022). Generally, root exudates capture microbes in soils and colonize root surfaces or infiltrate root cortexes (Visioli et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Mechanisms of As, Cd, Pb, and Zn hyperaccumulation by plants and their effects on soil microbiome in the rhizosphere

Asare

Száková

Tlustoš

2023

Front. Environ. Sci.

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Excess potentially toxic elements (PTEs), including arsenic (As), cadmium (Cd), lead (Pb), and zinc (Zn), above permissible limits in the environment, have detrimental effects on trophic levels. Hence, imperative to devise advertent measures to address this situation, especially in the soil ecosystem: the major reservoir of many PTEs. Using aerial plant parts (shoot) to accumulate As, Cd, Pb, and Zn - hyperaccumulators are considered a permanent approach to PTE removal from soils. This communication expatiated the principles that govern the hyperaccumulation of plants growing on As, Cd, Pb, and Zn-contaminated soils. The contribution of soil microbial communities during hyperaccumulation is well-elaborated to support the preference for this remediation approach. The study confirms a flow direction involving PTE uptake–translocation–tolerance–detoxification by hyperaccumulators. Rhizosphere microbes exhibit a direct preference for specific hyperaccumulators, which is associated with root exudations, while the resultant formation of chelates and solubility of PTEs, with soil physicochemical properties, including pH and redox potential, promote uptake. Different compartments of plants possess specialized transporter proteins and gene expressions capable of influx and efflux of PTEs by hyperaccumulators. After PTE uptake, many hyperaccumulators undergo cellular secretion of chelates supported by enzymatic catalysis and high transport systems with the ability to form complexes as tolerance and detoxification mechanisms. The benefits of combining hyperaccumulators with beneficial microbes such as endophytes and other rhizosphere microbes for PTE removal from soils are vital in enhancing plant survival and growth, minimizing metal toxicity, and supplying nutrients. Inoculation of suitable rhizosphere microbes can promote efficient cleaning of PTEs contaminated sites utilizing hyperaccumulator plants.

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Rhizosphere microbial community composition and survival strategies in oligotrophic and metal(loid) contaminated iron tailings areas

Cited by 45 publications

References 72 publications

Microbial community in the Leymus chinensis rhizosphere associates with its high production in mild saline–alkaline grassland

Microbial community in the Leymus chinensis rhizosphere associates with its high production in mild saline–alkaline grassland

Exopolysaccharide-producing bacteria enhanced Pb immobilization and influenced the microbiome composition in rhizosphere soil of pakchoi (Brassica chinensis L.)

Mechanisms of As, Cd, Pb, and Zn hyperaccumulation by plants and their effects on soil microbiome in the rhizosphere

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