Transgenic Plants for Enhanced Phytoremediation – Physiological Studies

Mello-Farias, Paulo; Chaves, Ana Lúcia Soares; Lencina, Claiton Leoneti

doi:10.5772/24355

Cited by 26 publications

(11 citation statements)

References 102 publications

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“…Some of the popular hyperaccumulator plants for which fortification protocols are pre-established include Brassica juncea (Indian mustard), Lycopersicon esculentum (tomato), Helianthus annuus (sunflower), and Liriodendron tulipifera (yellow poplar) [ 48 , 49 ]. One of the hyperaccumulator plants Brassica juncea was genetically modified to overexpress the desired gene E. coli gshII that encodes glutathione synthetase (GS) in the cytosol of the plant cell in order to increase tolerance and accumulation of cadmium (Cd) and the production of phytochelatins and its precursor glutathione.…”

Section: Genetically Modified Plants For Phytoremediationmentioning

confidence: 99%

“…Eapen & D’Souza (2005) have also reported that A. thaliana engineered with ars C and γ-ECS genes (from E. coli ) can transport and reduce the oxyanion arsenate (high toxicity) to arsenite (less toxic) form, within shoot tissues, where thiol peptide complexes could sequester arsenite easily [ 48 ]. In order to achieve enhanced phytovolatilization of elemental Hg, MerA and MerB genes have been expressed in certain hyperaccumulator plants which eventually increased mercury tolerance and phytovolatilization potential by several folds [ 62 , 63 ].…”

Section: Genetically Modified Plants For Phytoremediationmentioning

confidence: 99%

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Unravelling the Role of Rhizospheric Plant-Microbe Synergy in Phytoremediation: A Genomic Perspective

Agarwal

Giri

Rani

2020

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Accretion of organic and inorganic contaminants in soil interferes in the food chain thereby posing a serious threat to the ecosystem and adversely affecting crop productivity and human life. Both endophytic and rhizospheric microbial communities are responsible for biodegradation of toxic organic compounds and have capability to enhance uptake of heavy metals by plant via phytoremediation approaches. The diverse set of metabolic genes like, biosurfactant production, chemotaxis to organic compounds, biofilm production and modification of cell surface hydrophobicity, play significant role in bacterial driven bioremediation.Various genetic engineering approaches have been demonstrated to modulate the activity of specific microbial species in order to enhance their detoxification potential. Certain rhizospheric bacterial communities are genetically modified to produce specific enzymes that play role in degrading toxic pollutants. Few studies suggests that the overexpression of extracellular enzymes secreted by plant, fungi or rhizospheric microbes, can improve the degradation of specific organic pollutants in the soil. Plants and microbes dwell synergistically, where microbes draw benefit by nutrient acquisition from root exudates whereas they assist in plant growth and survival by producing certain plant growth promoting metabolites, nitrogen fixation, phosphate solubilisation, auxin production, siderophore production, and inhibition or suppression of plant pathogens. Thus, the plant-microbe interaction establishes the foundation of soil nutrient cycle as well as decreases soil toxicity by removal of harmful pollutants. The prospective of integrating genetic approach with bioremediation are crucial to evaluate connexions among microbial communities, plant communities and ecosystem processes with an eye on improving phytoremediation of contaminated sites.

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Section: Genetically Modified Plants For Phytoremediationmentioning

confidence: 99%

Section: Genetically Modified Plants For Phytoremediationmentioning

confidence: 99%

Unravelling the Role of Rhizospheric Plant-Microbe Synergy in Phytoremediation: A Genomic Perspective

Agarwal

Giri

Rani

2020

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“…Therefore, microorganisms and plants that have even more excellent capacities must be developed. There are several advantages to the use of recombinant microorganisms and plants [56][57][58]. For instance, the capacity of degradation or absorption per cell in recombinant microorganisms can be enhanced several (or several 10) times, and its amount of expression can be freely controlled by using an adequate promoter.…”

Section: Best Microorganisms and Plants To Remediate Pollution Of Soimentioning

confidence: 99%

Introductory Chapter: Serious Pollution of Soil and Groundwater and the Necessity of Bioremediation

Shiomi¹

2018

Advances in Bioremediation and Phytoremediation

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“…The improvement of a hyperaccumulator via gene manipulation is the most effective way to enhance its ability. Transgenic plants have been energetically developed since the 1990s [89][90][91][92]. Transgenic plants which could increase the volatility of heavy metals or decrease the toxicity of heavy metals may be the best candidates because the remediation process can be continuously carried out without removing the plants.…”

Section: Transgenic Approach To Improve the Phytoextraction Of Leadmentioning

confidence: 99%

“…The other mechanism is to obtain a high lead tolerance by enhancing the transport into the cell and vascular membranes. Higher tolerance and accumulation of Zn, Mn, and Cd were realized by the plants transformed with a zinc transporter (ZAT or AtMTP1), ShMTP, CAX2, AtMHX [89][90][91] or the AtNramp, AtPDR8, and AtATM3 genes of ABC transporters [98,99]. For lead accumulation, the following transgenic plants were studied: tobacco plants expressing the calmodulin-binding protein gene of Nicotiana tabacum (NtCBP4) [100] and Arabidopsis plants expressing the ZntA [101], which codes for the zinc transporter in E. coli, and an enhanced accumulation of lead, as well as other heavy metals, was observed.…”

Section: Transgenic Approach To Improve the Phytoextraction Of Leadmentioning

confidence: 99%

An assessment of the Causes of Lead Pollution and the Efficiency of Bioremediation by Plants and Microorganisms

Shiomi¹

2015

Advances in Bioremediation of Wastewater and Polluted Soil

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Abstract" rapid increase in mining industries associated with an increase in lead demand has resulted in the problem of lead poisoning. In this study, the initial causes of lead pollution were investigated. The results suggest that soil pollution from lead did not occur in urban and agricultural areas due to the efforts of decreased lead use and an increase in recycling however, serious pollution locally occurred in the areas where metallurgy and mining industries were present. Therefore, remediation must be carried out in the latter areas. Next, the efficiency of lead remediation by plants and microorganisms in the areas with increased lead pollution was assessed. The plants showing high potential have been developed, and phytoextraction is a promising process. However, a more cost-effective method is necessary to achieve widespread implementation. Thus, a novel remediation method the landfarming with immobilized microorganisms LIM method to overcome the problem of cost was proposed. The LIM method combines the immobilized technique with landfarming. "s the treatment period is short and the lead can readily be recycled from the soil, the LIM method may be a better alternative to phytoextraction for lead remediation. Keywords: Lead, Phytoextraction, "ioremediation, Landfarming© 2015 The Author(s). Licensee InTech. This chapter is distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. . IntroductionPollution by heavy metals has gradually worsened in "sian, "frican, and South "merican countries, partly due to the excessive use of pesticides for growing crops which may in turn lead to the pollution of groundwater and well water. "n investigation by the Food and "griculture Organization F"O /United Nations Environment Programme UNEP /World Health Organization WHO suggests that the number of patients with pesticide poisoning is approximately -million annually, and several thousand cases are fatal. In some "sian countries, wells reserved for drinking water were dug below the acceptable levels to avoid pesticide pollution, and consequently, many inhabitants developed arsenic poisoning [ , ]. Rivers and soils are also polluted by industrial wastes in those countries. In particular, wastes from metallurgy and mining industries contain various heavy metal ions, and wastes from leather industries contain cadmium and chromium. These wastes are typically exhausted and discarded in nearby rivers and in the air due to the lack of posttreatment equipment or strictly controlled landfill sites, resulting in detrimental groundwater and soil pollution."dditionally, environmental pollution by heavy metals has resulted in serious disease. In Japan, four historic cases of metal pollution occurring predominately in the s have been reported, which include ouch-ouch disease and Minamata disease. In , a mining company eliminated cadmium waste into a nearb...

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Transgenic Plants for Enhanced Phytoremediation – Physiological Studies

Cited by 26 publications

References 102 publications

Unravelling the Role of Rhizospheric Plant-Microbe Synergy in Phytoremediation: A Genomic Perspective

Unravelling the Role of Rhizospheric Plant-Microbe Synergy in Phytoremediation: A Genomic Perspective

Introductory Chapter: Serious Pollution of Soil and Groundwater and the Necessity of Bioremediation

An assessment of the Causes of Lead Pollution and the Efficiency of Bioremediation by Plants and Microorganisms

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