Biological Strategies for Heavy Metal Remediation

Tekere, Memory

doi:10.1007/978-3-030-48985-4_18

Cited by 9 publications

(2 citation statements)

References 73 publications

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“…Microbes develop and utilize several detoxification processes as a result of their varied survival approaches in heavy metal-contaminated environments [ 17 ]. Biosorption, bioaccumulation, biotransformation, and biomineralization are the primary detoxification processes that could be employed for bioremediation either in ex situ or in situ conditions [ 18 ]. Polysaccharides, lipids, and proteins make up the majority of microbial cell walls, and they include various side chains that chemically bind metal ions, including carboxylate, hydroxyl, and amino acids and phosphate groups [ 19 ].…”

Section: Introductionmentioning

confidence: 99%

Phytohormones Producing Acinetobacter bouvetii P1 Mitigates Chromate Stress in Sunflower by Provoking Host Antioxidant Response

et al. 2021

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Different physical and chemical techniques are used for the decontamination of Cr+6 contaminated sites. The techniques are expensive, laborious, and time-consuming. However, remediation of Cr+6 by microbes is viable, efficient, and cost-effective. In this context, plant growth-promoting rhizobacteria Acinetobacter bouvetii P1 isolated from the industrial zone was tested for its role in relieving Cr+6 induced oxidative stress in sunflower. At the elevated Cr+6 levels and in the absence of P1, the growth of the sunflower plants was inhibited. In contrast, the selected strain P1 restored the sunflower growth under Cr+6 through plant growth–promoting interactions. Specifically, P1 biotransformed the Cr+6 into a stable and less toxic Cr+3 form, thus avoiding the possibility of phytotoxicity. On the one hand, the P1 strengthened the host antioxidant system by triggering higher production of enzymatic antioxidants, including catalases, ascorbate peroxidase, superoxide dismutase, and peroxidase. Similarly, P1 also promoted higher production of nonenzymatic antioxidants, such as flavonoids, phenolics, proline, and glutathione. Apart from the bioremediation, P1 solubilized phosphate and produced indole acetic acid, gibberellic acid, and salicylic acid. The production of phytohormones not only helped the host plant growth but also mitigated the harsh condition posed by the elevated levels of Cr+6. The findings mentioned above suggest that P1 may serve as an excellent phyto-stimulant and bio-remediator in a heavy metal-contaminated environment.

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Section: Introductionmentioning

confidence: 99%

Phytohormones Producing Acinetobacter bouvetii P1 Mitigates Chromate Stress in Sunflower by Provoking Host Antioxidant Response

et al. 2021

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“…The inexpensive rehabilitation of contaminated soils can be attained through the employment of bacteria and vegetation that stabilize and/or extract metals from the soils, namely bioremediation and phytoremediation. They are considered as environmentally friendly alternative cleanup methods for decontaminating heavy metals or organic pollutants from the environment, particularly in agricultural farmlands, waste sites, or polluted waters [ 1 , 2 ]. These approaches are also considered economical and effective [ 3 ], and interestingly, they interfere less with the soil structure and they are more accepted by the public than other approaches or conventional techniques [ 1 , 4 ].…”

Section: Introductionmentioning

confidence: 99%

Native Heavy Metal-Tolerant Plant Growth Promoting Rhizobacteria Improves Sulla spinosissima (L.) Growth in Post-Mining Contaminated Soils

2022

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The potential of rhizobacteria in assisting plants used in the phytostabilization or re-vegetation of soils contaminated by heavy metals is gaining interest all around the world. In this context, six rhizobacterial strains isolated from highly heavy metal-contaminated soils situated in abandoned mining sites around the Oujda region (Morocco) were tested with Sulla spinosissima (L.), a native leguminous plant expanding in this area. The strains used were multi-resistant to heavy metals and possessed multiple plant growth-promoting traits. Potential beneficial effects of the strains were also evaluated in planta by measuring various growth and physiological parameters of inoculated Sulla plants grown in sterilized sand. Inoculation with the Rhodococcus qingshengii strain LMR340 boosted plant biomass (39% to 83% increase compared to uninoculated plants), chlorophyll and carotenoid content (up to 29%), and antioxidant enzyme activities (15% to 80% increase). Based on these interesting findings, selected strains were inoculated into plants growing in a heavy metal, multi-polluted, and poor soil. Under these conditions, non-inoculated plants and those inoculated with the strain LMR250 were unable to grow, while the other five bacterial inoculants restored plant growth. The best performing strain, Pseudarthrobacter oxydans LMR291, could be considered as a good biofertilizer and/or biostimulant candidate to be used for promoting the growth of selected plants in re-vegetation and/or phytostabilization programs of degraded and contaminated soils.

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Sustainable Management of Environmental Contaminants: Factors, Control, and Phytoremediation

Naz

Raza

Tariq

et al. 2022

Sustainable Management of Environmental Contaminants

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Biological Strategies for Heavy Metal Remediation

Cited by 9 publications

References 73 publications

Phytohormones Producing Acinetobacter bouvetii P1 Mitigates Chromate Stress in Sunflower by Provoking Host Antioxidant Response

Phytohormones Producing Acinetobacter bouvetii P1 Mitigates Chromate Stress in Sunflower by Provoking Host Antioxidant Response

Native Heavy Metal-Tolerant Plant Growth Promoting Rhizobacteria Improves Sulla spinosissima (L.) Growth in Post-Mining Contaminated Soils

Sustainable Management of Environmental Contaminants: Factors, Control, and Phytoremediation

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