Rhizoremediation – A promising tool for the removal of soil contaminants: A review

Saravanan, A.; Jeevanantham, S.; Narayanan, V. Anantha; Kumar, P. Senthil; Yaashikaa, P.R.; Muthu, Chinakannu Marimuthu Mathan

doi:10.1016/j.jece.2019.103543

Cited by 76 publications

(27 citation statements)

References 103 publications

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“…Plants suitable for phytoremediation of heavy metals should have a fast growth, high biomass and widespread roots, be easily harvested and, naturally, be able to tolerate and accumulate those heavy metals [43]. Plants can achieve phytoremediation through different approaches such as phytostabilization, phytovolatilization, phytoextraction, rhizofiltration or phytodegradation, and all of them have advantages and disadvantages [44]. Rhizoremediation is the removal of heavy metals from the environment by the roots of plants in association with the microorganisms present in the rhizosphere [44], and rhizostabilization is the immobilization of contaminants by absorption, precipitation or complexation, therefore reducing their bioavailability and distribution in the wildlife food chain [45].…”

Section: Introductionmentioning

confidence: 99%

“…Plants can achieve phytoremediation through different approaches such as phytostabilization, phytovolatilization, phytoextraction, rhizofiltration or phytodegradation, and all of them have advantages and disadvantages [44]. Rhizoremediation is the removal of heavy metals from the environment by the roots of plants in association with the microorganisms present in the rhizosphere [44], and rhizostabilization is the immobilization of contaminants by absorption, precipitation or complexation, therefore reducing their bioavailability and distribution in the wildlife food chain [45]. Phytosequestration is the ability of plants to sequester contaminants in the root zone, and it is used as a synonym of rhizostabilization or phytostabilization in plant roots.…”

Section: Introductionmentioning

confidence: 99%

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Nodulated White Lupin Plants Growing in Contaminated Soils Accumulate Unusually High Mercury Concentrations in Their Nodules, Roots and Especially Cluster Roots

et al. 2021

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Two white lupin (Lupinus albus L.) cultivars were tested for their capacity to accumulate mercury when grown in Hg-contaminated soils. Plants inoculated with a Bradyrhizobium canariense Hg-tolerant strain or non-inoculated were grown in two highly Hg-contaminated soils. All plants were nodulated and presented a large number of cluster roots. They accumulated up to 600 μg Hg g−1 DW in nodules, 1400 μg Hg g−1 DW in roots and 2550 μg Hg g−1 DW in cluster roots. Soil, and not cultivar or inoculation, was accountable for statistically significant differences. No Hg translocation to leaves or seeds took place. Inoculated L. albus cv. G1 plants were grown hydroponically under cluster root-promoting conditions in the presence of Hg. They accumulated about 500 μg Hg g−1 DW in nodules and roots and up to 1300 μg Hg g−1 DW in cluster roots. No translocation to the aerial parts occurred. Bioaccumulation factors were also extremely high, especially in soils and particularly in cluster roots. To our knowledge, Hg accumulation in cluster roots has not been reported to date. Our results suggest that inoculated white lupin might represent a powerful phytoremediation tool through rhizosequestration of Hg in contaminated soils. Potential uptake and immobilization mechanisms are discussed.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Nodulated White Lupin Plants Growing in Contaminated Soils Accumulate Unusually High Mercury Concentrations in Their Nodules, Roots and Especially Cluster Roots

et al. 2021

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“…The pollutants accumulated in plants can be degraded by microorganisms introduced into the tissues of the plant. When suitable microbial strain is introduced into the pollutant environment with a suitable plant (more absorbance and strong tolerance), the combined system of both plant and microbe together combine with the indigenous population to enhance the bioremediation process by several mechanisms and environmental factors (Erguven, Yildirim and Adar 2017 ; Kuiper et al 2004 ; Lee et al 2020 ; Saravanan et al 2020 ; Truu et al 2015 ; Fig. 1 ).…”

Section: Introductionmentioning

confidence: 99%

Enhanced remediation of pollutants by microorganisms–plant combination

Supreeth

2021

Int. J. Environ. Sci. Technol.

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The pollutants have become ubiquitous in the total environment (water, soil and air) due to human activities and they are hazardous to all forms of life on the earth. This problem has made scientists focus on mitigating or complete reduction in pollutants by several means. Microorganism and plants are known to scavenge pollutants. Both are studied enormously in reducing, refining, and removing pollutants from the environment successfully. But, their slow process for removal is disadvantage. However, according to recent advancements in the abatement of pollutants, a combined system of both microorganisms and plant has shown to enhance the remediation of pollutants to an efficient level. In a nutrient-depleted pollutant-rich environment, when suitable plant and microorganisms are introduced, the plant interacts with the rhizosphere and root associate with microorganisms to survive in toxic conditions. The chemicals released by plants signal the microorganisms for interactions. This interaction leads in higher germination efficiency and enhanced root elongation which results in enhanced degradation of pollutants in both rhizosphere and phyllosphere. In this background, the current review article provides an overview of the recent advancement in microorganisms plant combined systems in enhanced removal of several recalcitrant pollutants. The conclusion highlights the challenges and future perspectives in this area of research.

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“…Therefore, phytoremediation is a feasible and environmentally friendly way for people to treat solid waste [3,6,[15][16][17][18][19][20][21][22]. Saravanan et al believed that during the growth process of plants, root exudates promoted the growth and activity of rhizosphere microbial community to form a plant-microbial interaction model to remediation soil pollution [23]. Zdenek et al studied the long-term remediation of polycyclic aromatic hydrocarbons (PAHs) by willow (Salix x smithiana Willd) from straw burning y ash contaminated soil, and found that the total removal rate of PAHs by phytoremediation was 50.9%, while the total removal rate by natural decay was 9.9% [24].…”

Section: Introductionmentioning

confidence: 99%

Influence of Planting Xanthoceras Sorbifolia Bunge on Bacteria and Fungi Diversity of Fly Ash

Liu¹,

Chen²,

Huo³

et al. 2021

Preprint

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Background: Fly ash is the product of coal combustion, and a large amount of fly ash accumulation is of great harm to the environment. The yellow horn (Xanthoceras sorbifolia Bunge) is a unique edible oil tree species in China. Yellow horn has developed root system and can survive in soil contaminated with heavy metals. Thus, it could be used for phytoremediation in fly ash. Results: In this study, high-throughput 16S rRNA and ITS rDNA gene Illumina sequencing technology was used to analyze the microbial community diversity in fly ash before (CK group) and after (S group) planting yellow horn. The abundance and diversity of microorganisms in fly ash were changed by planting yellow horn. The dominant bacterial phyla: Proteobacteria (CK-24% vs S-42%), Firmicutes (CK-23% vs S-10%), Actinobacteria (CK-15% vs S-11%). The dominant phyla in fungi: Ascomycota (72% for CK, 69% for S), Mortierellomycota (4% for CK, 3% for S).Some beneficial bacteria that could degrade heavy metals increased in proportion, including Betaproteobacteriales (4% for CK vs 10% for S group), Burkholderiacae (1% for CK vs 6% for S groups), Nitrospirae (0.3% for CK vs 0.8% for S groups), Rhizobiales (3% for CK vs 6% for S groups) and Sphingomonadaceae (2% for CK vs 4% for S groups). Conclusion: These results indicate that the planting of yellow horn can increase the abundance of heavy metal-degrading bacteria in rhizosphere fly ash, which is of great significance for the biological remediation of fly ash.

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Rhizoremediation – A promising tool for the removal of soil contaminants: A review

Cited by 76 publications

References 103 publications

Nodulated White Lupin Plants Growing in Contaminated Soils Accumulate Unusually High Mercury Concentrations in Their Nodules, Roots and Especially Cluster Roots

Nodulated White Lupin Plants Growing in Contaminated Soils Accumulate Unusually High Mercury Concentrations in Their Nodules, Roots and Especially Cluster Roots

Enhanced remediation of pollutants by microorganisms–plant combination

Influence of Planting Xanthoceras Sorbifolia Bunge on Bacteria and Fungi Diversity of Fly Ash

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