<i>Rhizobacteria</i> and phytoremediation of heavy metals

Zubair, Mahrukh; Shakir, Mehak; Ali, Qurban; Rani, Noshaba; Fatima, Naz; Farooq, Safana; Shafiq, Sijjil; Kanwal, Naila; Ali, Fawad; Nasir, Idrees Ahmad

doi:10.1080/21622515.2016.1259358

Cited by 100 publications

(52 citation statements)

References 46 publications

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“…They limit bioavailability of metals by forming complexes with siderophores, particular metabolites, and bacterial transporters ( Rajkumar et al, 2010 ; Ahemad, 2012 ). These microorganisms of agronomic importance have evolved various mechanisms to avoid heavy metal stress including: (a) transport of metals across cytoplasmic membrane; (b) biosorption and bioaccumulation to the cell walls; (c) metal entrapment in the extracellular capsules; (d) heavy metals precipitation; and (e) metal detoxification via oxidation–reduction ( Zubair et al, 2016 ). Heavy-metal-tolerant PGPR including Bacillus, Pseudomonas, Streptomyces , and Methylobacterium have the potential to improve growth and production of crops by reducing the detrimental effects of heavy metals ( Sessitsch et al, 2013 ).…”

Section: Microbial Remediation Of Heavy Metals For Plant Growth Promomentioning

confidence: 99%

Heavy Metal Stress, Signaling, and Tolerance Due to Plant-Associated Microbes: An Overview

2018

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Several anthropogenic activities including mining, modern agricultural practices, and industrialization have long-term detrimental effect on our environment. All these factors lead to increase in heavy metal concentration in soil, water, and air. Soil contamination with heavy metals cause several environmental problems and imparts toxic effect on plant as well as animals. In response to these adverse conditions, plants evolve complex molecular and physiological mechanisms for better adaptability, tolerance, and survival. Nowadays conventional breeding and transgenic technology are being used for development of metal stress resistant varieties which, however, are time consuming and labor intensive. Interestingly the use of microbes as an alternate technology for improving metal tolerance of plants is gaining momentum recently. The use of these beneficial microorganisms is considered as one of the most promising methods for safe crop-management practices. Interaction of plants with soil microorganisms can play a vital role in acclimatizing plants to metalliferous environments, and can thus be explored to improve microbe-assisted metal tolerance. Plant-associated microbes decrease metal accumulation in plant tissues and also help to reduce metal bioavailability in soil through various mechanisms. Nowadays, a novel phytobacterial strategy, i.e., genetically transformed bacteria has been used to increase remediation of heavy metals and stress tolerance in plants. This review takes into account our current state of knowledge of the harmful effects of heavy metal stress, the signaling responses to metal stress, and the role of plant-associated microbes in metal stress tolerance. The review also highlights the challenges and opportunities in this continued area of research on plant–microbe–metal interaction.

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Section: Microbial Remediation Of Heavy Metals For Plant Growth Promomentioning

confidence: 99%

Heavy Metal Stress, Signaling, and Tolerance Due to Plant-Associated Microbes: An Overview

2018

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“…According to scientific literature date [10,13,25,49,51], soil demetallization technologies are characterized by: 1) a high degree of metal recovery (in some cases up to 95-95%); 2) low productivity of installations (from 10 to 300 tons of soil per day); 3) the high cost of cleaning (100-450 USD per 1 m3 of soil). It is also necessary to note that a soil that has undergone a full treatment cycle often loses a number of its leading properties.…”

Section: Ex Situ Healthy Of Contaminated Soilmentioning

confidence: 99%

“…In the first case, technologies of active direct inactivation of metals are implemented. The second implements technologies of active indirect inactivation of metals [12,14,32,51].…”

Section: Return Cleared Soil Back To Point Of Originmentioning

confidence: 99%

“…Microorganisms are able to extract metals from the soil as a result of reactions: adsorption, precipitation and oxidation; changes in the valence of metals, extracellular chemical deposition, volatilization; oxidation, immobilization and binding; binding, changes in the valence of metals, volatilization, extracellular chemical deposition and symbiosis with plants [6,13,43,47,51].…”

Section: Return Cleared Soil Back To Point Of Originmentioning

confidence: 99%

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Modern environmental technologies of healthy soils contaminated by heavy metals and radionuclides

et al. 2020

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Object of research: to systematize (taking into account the possible consequences to biosphere) the known technologies for ecological restoration of soils contaminated by heavy metals and radionuclides. Only a healing technology should be recognized as one possible methodology for solving any soil problems. For soils contaminated by heavy metals and radionuclides healing patterns is conceptually ordered into the following levels: mission, strategy, technology. The mission of healthy soil should be aimed at maintaining the chemical elements content within the optimum interval. The strategy of healthy soil involves the regulation of individual elements content in the soil. Ex-situ a soil healing technology is implemented outside the original pollution site. In-situ, a soil healing technology is carried out directly on the original pollution site. Excavation of the contaminated soil layer is the first stage for ex-situ soil restoration. In the future it will be possible: 1) storage of contaminated soil at special landfills, 2) treatment of contaminated soil at a special reactor. All technologies for in-situ healthy of heavy metals contaminated soils can be ordered as: 1) localization, 2) deconcentration, 3) inactivation, 4) extraction.

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“…Heavy-metal stressed plants may protect themselves from reactive oxygen species thought the production of antioxidant enzymes or scavenger compounds [123]. Recently, PGP bacteria, including rhizobia, have been shown to reduce the toxicity of plant exposure to heavy metals [124,125]. Heavy-metal contaminated soil remediation can be performed with different strategies [126].…”

Section: Plant Growth Promoting Rhizobia In Heavy Metal Contaminated mentioning

confidence: 99%

Deciphering the Symbiotic Plant Microbiome: Translating the Most Recent Discoveries on Rhizobia for the Improvement of Agricultural Practices in Metal-Contaminated and High Saline Lands

et al. 2019

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Rhizosphere and plant-associated microorganisms have been intensely studied for their beneficial effects on plant growth and health. These mainly include nitrogen-fixing bacteria (NFB) and plant-growth promoting rhizobacteria (PGPR). This beneficial fraction is involved in major functions such as plant nutrition and plant resistance to biotic and abiotic stresses, which include water deficiency and heavy-metal contamination. Consequently, crop yield emerges as the net result of the interactions between the plant genome and its associated microbiome. Here, we provide a review covering recent studies on PGP rhizobia as effective inoculants for agricultural practices in harsh soil, and we propose models for inoculant combinations and genomic manipulation strategies to improve crop yield.

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Rhizobacteria and phytoremediation of heavy metals

Cited by 100 publications

References 46 publications

Heavy Metal Stress, Signaling, and Tolerance Due to Plant-Associated Microbes: An Overview

Heavy Metal Stress, Signaling, and Tolerance Due to Plant-Associated Microbes: An Overview

Modern environmental technologies of healthy soils contaminated by heavy metals and radionuclides

Deciphering the Symbiotic Plant Microbiome: Translating the Most Recent Discoveries on Rhizobia for the Improvement of Agricultural Practices in Metal-Contaminated and High Saline Lands

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