Exploiting Hydrocarbon‐Degrading Indigenous Bacteria for Bioremediation and Phytoremediation of a Multicontaminated Soil

Franchi, Elisabetta; Agazzi, Gloria; Rolli, Eleonora; Borin, Sara; Marasco, Ramona; Chiaberge, Stefano; Conte, Alessandro; Filtri, Paolo; Pedron, Francesca; Rosellini, Irene; Barbafieri, Meri; Petruzzelli, G.

doi:10.1002/ceat.201500573

Cited by 26 publications

(8 citation statements)

References 37 publications

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“…Plant growth promotion activities have been frequently reported in bacteria from polluted soils ( Croes et al, 2013 ; Thijs et al, 2014 ; Franchi et al, 2016 ), according to the ability of plants to select beneficial bacteria when growing under phytotoxic and stress conditions. Likewise, IAA production and ACC deaminase activity are PGP traits well represented in the cultivable biphenyl-utilizing rhizobacteria hosted by all the three plant species.…”

Section: Discussionmentioning

confidence: 99%

Bacteria Associated to Plants Naturally Selected in a Historical PCB Polluted Soil Show Potential to Sustain Natural Attenuation

et al. 2017

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The exploitation of the association between plants and microorganisms is a promising approach able to boost natural attenuation processes for soil clean-up in vast polluted areas characterized by mixed chemical contamination. We aimed to explore the selection of root-associated bacterial communities driven by different plant species spontaneously established in abandoned agricultural soils within a historical polluted site in north Italy. The site is highly contaminated by chlorinated persistent organic pollutants, mainly constituted by polychlorobiphenyls (PCBs), together with heavy metals and metalloids, in variable concentrations and uneven distribution. The overall structure of the non-vegetated and root-associated soil fractions bacterial communities was described by high-throughput sequencing of the 16S rRNA gene, and a collection of 165 rhizobacterial isolates able to use biphenyl as unique carbon source was assayed for plant growth promotion (PGP) traits and bioremediation potential. The results showed that the recruitment of specific bacterial communities in the root-associated soil fractions was driven by both soil fractions and plant species, explaining 21 and 18% of the total bacterial microbiome variation, respectively. PCR-based detection in the soil metagenome of bacterial bphA gene, encoding for the biphenyl dioxygenase α subunit, indicated that the soil in the site possesses metabolic traits linked to PCB degradation. Biphenyl-utilizing bacteria isolated from the rhizosphere of the three different plant species showed low phylogenetic diversity and well represented functional traits, in terms of PGP and bioremediation potential. On average, 72% of the strains harbored the bphA gene and/or displayed catechol 2,3-dioxygenase activity, involved in aromatic ring cleavage. PGP traits, including 1-aminocyclopropane-1-carboxylic acid deaminase activity potentially associated to plant stress tolerance induction, were widely distributed among the isolates according to in vitro assays. PGP tested in vivo on tomato plants using eleven selected bacterial isolates, confirmed the promotion and protection potential of the rhizosphere bacteria. Different spontaneous plant species naturally selected in a historical chronically polluted site showed to determine the enrichment of peculiar bacterial communities in the soil fractions associated to the roots. All the rhizosphere communities, nevertheless, hosted bacteria with degradation/detoxification and PGP potential, putatively sustaining the natural attenuation process.

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Section: Discussionmentioning

confidence: 99%

Bacteria Associated to Plants Naturally Selected in a Historical PCB Polluted Soil Show Potential to Sustain Natural Attenuation

et al. 2017

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“…Microbial populations degrade the complex substances present in the biomass to simpler ones that can be reused or recycled through environmental processes. The techniques adopted can either be aerobic or anaerobic, depending on the nature of bacteria, fungi or algae involved in the degradation [ 27 ]. The microbial degradation techniques reduce the soil toxicity, promote plant growth through provision of growth accelerating metabolites and provide plant nutrients through sequestration from soil [ 28 ].…”

Section: Crop Residue: Composition and Decomposing Mechanismsmentioning

confidence: 99%

Crop Residue Burning in India: Policy Challenges and Potential Solutions

Bhuvaneshwari

Hettiarachchi

Meegoda

2019

IJERPH

507

200

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India, the second largest agro-based economy with year-round crop cultivation, generates a large amount of agricultural waste, including crop residues. In the absence of adequate sustainable management practices, approximately 92 seems a very small number of metric tons of crop waste is burned every year in India, causing excessive particulate matter emissions and air pollution. Crop residue burning has become a major environmental problem causing health issues as well as contributing to global warming. Composting, biochar production and mechanization are a few effective sustainable techniques that can help to curtail the issue while retaining the nutrients present in the crop residue in the soil. The government of India has attempted to curtail this problem, through numerous measures and campaigns designed to promote sustainable management methods such as converting crop residue into energy. However, the alarming rise of air pollution levels caused by crop residue burning in the city of Delhi and other northern areas in India observed in recent years, especially in and after the year of 2015, suggest that the issues is not yet under control. The solution to crop residue burning lies in the effective implementation of sustainable management practices with Government interventions and policies. This manuscript addresses the underlying technical as well as policy issues that has prevented India from achieving a long-lasting solution and also potential solutions that have been overlooked. However, effective implementation of these techniques also requires us to look at other socioeconomic aspects that had not been considered. This manuscript also discusses some of the policy considerations and functionality based on the analyses and current practices. The agricultural waste sector can benefit immensely from some of the examples from other waste sectors such as the municipal solid waste (MSW) and wastewater management where collection, segregation, recycling and disposal are institutionalized to secure an operational system. Active stakeholder involvement including education and empowerment of farmers along with technical solutions and product manufacturing can also assist tremendously. Even though the issue of crop residue burning touches many sectors, such as environment, agriculture, economy, social aspects, education, and energy, the past governmental efforts mainly revolved around agriculture and energy. This sectorial thinking is another barrier that needs to be broken. The government of India as well as governments of other developing countries can benefit from the emerging concept of nexus thinking in managing environmental resources. Nexus thinking promotes a higher-level integration and higher level of stakeholder involvement that goes beyond the disciplinary boundaries, providing a supporting platform to solve issues such as crop residue burning.

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“…After 180 days, TPH rhizoremediation efficiency was 90, 85, 70, and 76% for plants inoculated with the microbial consortium, plants not inoculated, a control without plants nor the microbial consortium, and a control with the microbial consortium without plants, respectively, suggesting the beneficial effect of the added microbial inoculum in a rhizoremediation approach (Escalante-Espinosa et al 2005). Likewise, the exploitation of hydrocarbon-degrading and plant growth-promoting indigenous bacteria enhanced the phytoremediation process in a mixed-contaminated (nickel + copper + alkylaromatic hydrocarbons) soil (Franchi et al 2016). In this study, the metal-tolerant bacteria, including SMV187.1, SMV189.20, SMV196.26, SMV197.30, SMV201.7, and SMV206.42, isolated from a polluted site, were shown to enhance both the shoot and root biomass and metal uptake potential of sunflower (Helianthus annuus) grown in the above-mentioned soil pre-treated with a land-farming process.…”

Section: Addition Of Biodegrading Microorganismsmentioning

confidence: 96%

Rhizoremediation as a green technology for the remediation of petroleum hydrocarbon-contaminated soils

Hoang

Lamb

Seshadri

et al. 2021

Journal of Hazardous Materials

121

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Highlights • Recalcitrant fractions of petroleum hydrocarbon (TPH) cometabolized for remediation • Biostimulation provides propitious environment for degraders in the rhizosphere • Bioaugmentation can supplement the catabolic activities of rhizosphere communities • Effective rhizoremediation requires the modulation of plant-microbial associations • Rhizoremediation of TPH-contaminated sites is a risk-based phytomanagement strategy

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Exploiting Hydrocarbon‐Degrading Indigenous Bacteria for Bioremediation and Phytoremediation of a Multicontaminated Soil

Cited by 26 publications

References 37 publications

Bacteria Associated to Plants Naturally Selected in a Historical PCB Polluted Soil Show Potential to Sustain Natural Attenuation

Bacteria Associated to Plants Naturally Selected in a Historical PCB Polluted Soil Show Potential to Sustain Natural Attenuation

Crop Residue Burning in India: Policy Challenges and Potential Solutions

Rhizoremediation as a green technology for the remediation of petroleum hydrocarbon-contaminated soils

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