Mycoremediation: a treatment for heavy metal-polluted soil using indigenous metallotolerant fungi

Khan, Ibrar; Ali, Madiha Bou; Aftab, Maryam; Shakir, SajidUllah; Qayyum, Sumaira; Haleem, Kashif Syed; Tauseef, Isfahan

doi:10.1007/s10661-019-7781-9

Cited by 63 publications

(19 citation statements)

References 48 publications

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“…This facilitates supplementary intracellular uptake, unlike powdered biosorbents. Living fungal cells recovered from contaminated substrates have biosorption capacities in Hg-contaminated medium, in the 0.017–40.2 mg/g Hg 2+ range [ 80 , 88 , 112 , 118 ]. Finally, the Hg 2+ bioremediation potential from highly contaminated aqueous substrate was demonstrated for five species which were isolated and identified in this study.…”

Section: Discussionmentioning

confidence: 99%

“…Biomasses developed by fungal species isolated from Turda had superior Hg 2+ biosorption capacity in aqueous solution, relative to values reported for related studies [80,88,[112][113][114][115][116][117]. However, various fungal and fungal-derived types of biosorbents have previously been investigated for their Hg removal and Q, under widely variable experimental conditions [40,45,[111][112][113][114][115][116][117][118]. Thus, a uniform comparison is unattainable for such heterogeneous conditions.…”

Section: Discussionmentioning

confidence: 99%

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Heavy Metal-Resistant Filamentous Fungi as Potential Mercury Bioremediators

Văcar

Covaci

Chakraborty

et al. 2021

JoF

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Filamentous fungi native to heavy metals (HMs) contaminated sites have great potential for bioremediation, yet are still often underexploited. This research aimed to assess the HMs resistance and Hg remediation capacity of fungi isolated from the rhizosphere of plants resident on highly Hg-contaminated substrate. Analysis of Hg, Pb, Cu, Zn, and Cd concentrations by X-ray spectrometry generated the ecological risk of the rhizosphere soil. A total of 32 HM-resistant fungal isolates were molecularly identified. Their resistance spectrum for the investigated elements was characterized by tolerance indices (TIs) and minimum inhibitory concentrations (MICs). Clustering analysis of TIs was coupled with isolates’ phylogeny to evaluate HMs resistance patterns. The bioremediation potential of five isolates’ live biomasses, in 100 mg/L Hg2+ aqueous solution over 48 h at 120 r/min, was quantified by atomic absorption spectrometry. New species or genera that were previously unrelated to Hg-contaminated substrates were identified. Ascomycota representatives were common, diverse, and exhibited varied HMs resistance spectra, especially towards the elements with ecological risk, in contrast to Mucoromycota-recovered isolates. HMs resistance patterns were similar within phylogenetically related clades, although isolate specific resistance occurred. Cladosporium sp., Didymella glomerata, Fusarium oxysporum, Phoma costaricensis, and Sarocladium kiliense isolates displayed very high MIC (mg/L) for Hg (140–200), in addition to Pb (1568), Cu (381), Zn (2092–2353), or Cd (337). The Hg biosorption capacity of these highly Hg-resistant species ranged from 33.8 to 54.9 mg/g dry weight, with a removal capacity from 47% to 97%. Thus, the fungi identified herein showed great potential as bioremediators for highly Hg-contaminated aqueous substrates.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Heavy Metal-Resistant Filamentous Fungi as Potential Mercury Bioremediators

Văcar

Covaci

Chakraborty

et al. 2021

JoF

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“…Bioremediation involving soil microorganisms is proposed as a cost-effective and environmentally friendly method to rehabilitate land contaminated by heavy metals to speed up the recovery of ecosystems and biodiversity [ 224 ]. The indigenous fungal strains Aspergillus fumigatus and A. terreus isolated from contaminated soil showed excellent Pb and Hg removal capability [ 225 ]. Meanwhile, Aeromonas , Bacillus and Pseudomonas act as important organisms in the remediation of heavy metal-contaminated soil [ 226 ].…”

Section: Roles Of Microorganisms In Soil Bioremediation and The Poten...mentioning

confidence: 99%

Contributions of Beneficial Microorganisms in Soil Remediation and Quality Improvement of Medicinal Plants

Gang

Ren

Bai

et al. 2022

Plants

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Medicinal plants (MPs) are important resources widely used in the treatment and prevention of diseases and have attracted much attention owing to their significant antiviral, anti-inflammatory, antioxidant and other activities. However, soil degradation, caused by continuous cropping, excessive chemical fertilizers and pesticide residues and heavy metal contamination, seriously restricts the growth and quality formation of MPs. Microorganisms, as the major biota in soil, play a critical role in the restoration of the land ecosystem. Rhizosphere microecology directly or indirectly affects the growth and development, metabolic regulation and active ingredient accumulation of MPs. Microbial resources, with the advantages of economic efficiency, harmless to environment and non-toxic to organisms, have been recommended as a promising alternative to conventional fertilizers and pesticides. The introduction of beneficial microbes promotes the adaptability of MPs to adversity stress by enhancing soil fertility, inhibiting pathogens and inducing systemic resistance. On the other hand, it can improve the medicinal quality by removing soil pollutants, reducing the absorption and accumulation of harmful substances and regulating the synthesis of secondary metabolites. The ecological and economic benefits of the soil microbiome in agricultural practices are increasingly recognized, but the current understanding of the interaction between soil conditions, root exudates and microbial communities and the mechanism of rhizosphere microecology affecting the secondary metabolism of MPs is still quite limited. More research is needed to investigate the effects of the microbiome on the growth and quality of different medicinal species. Therefore, the present review summarizes the main soil issues in medicinal plant cultivation, the functions of microbes in soil remediation and plant growth promotion and the potential mechanism to further guide the use of microbial resources to promote the ecological cultivation and sustainable development of MPs.

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“…[69]. Nonpoint sources of pollution such as the unregulated release and disposal of domestic and industrial wastewater adversely affects organisms in aquatic ecosystems [70]. Even non-significant concentrations of HMs pose noticeable problems in fauna and flora [71].…”

Section: Major Sources and Adverse Effects Of Heavy Metalsmentioning

confidence: 99%

Phycoremediation: Use of Algae to Sequester Heavy Metals

2022

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Industrialization, natural processes, and urbanization have potentially accelerated the pace and the level of heavy metals (HMs) in soil and underground water. These HMs may be accumulated in plants and animals when they take up such contaminated water, and then make their way into human food chains. Several remediation technologies have been employed to take up HMs. Diverse conventional means such as ion exchange, electrolytic technologies, and chemical extraction have been employed in the past, but the majority of these techniques are not economical for extensive projects and they need stringent control and continuous monitoring. These technologies also have low efficiency for effective removal of HMs. In this context, algae offer an eco-friendly and sustainable alternative for remediation of HMs from polluted water. The accumulation of HMs by macro and microalgae is advantageous for phycoremediation compared to other approaches that are not economical and not environmentally friendly. So, there is an urgent necessity to refine the chances of accumulation of HMs in algae, employing the techniques of genetic engineering to create transgenic species for over-expressing metallothioneins and phytochelatins, which may form complexes with HMs and store them in vacuoles to make the maximum use of phytoaccumulation while also removing hazardous metals from the aquatic habitats. This review outlines the major sources of HMs, their adverse effects on humans, the potential of algae in phytoremediation (called phycoremediation), and their uptake mechanism of HMs.

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Mycoremediation: a treatment for heavy metal-polluted soil using indigenous metallotolerant fungi

Cited by 63 publications

References 48 publications

Heavy Metal-Resistant Filamentous Fungi as Potential Mercury Bioremediators

Heavy Metal-Resistant Filamentous Fungi as Potential Mercury Bioremediators

Contributions of Beneficial Microorganisms in Soil Remediation and Quality Improvement of Medicinal Plants

Phycoremediation: Use of Algae to Sequester Heavy Metals

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