Arsenic uptake by plants and possible phytoremediation applications: a brief overview

Vithanage, Meththika; Dabrowska, Beata; Mukherjee, Arun B.; Sandhi, Arifin; Bhattacharya, Prosun

doi:10.1007/s10311-011-0349-8

Cited by 161 publications

(47 citation statements)

References 93 publications

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“…Synechocystis (10 mL at the exponential growth stage) was inoculated in 90 mL of P modified BG-11 medium adjusted as follows: 5 μM of PO 4 3-as the P-limited condition (replaced with equal concentration of K + using KCl), 230 μM of PO 4 3-as the P-rich condition. Arsenic was supplied as NaAsO 2 at 10 μM.…”

Section: ■ Materials and Methodsmentioning

confidence: 99%

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Cyanobacteria-Mediated Arsenic Redox Dynamics Is Regulated by Phosphate in Aquatic Environments

Zhang

Rensing

Zhu

2013

Environ. Sci. Technol.

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Studies of cyanobacteria in environments where arsenic (As) and phosphate (P) both occur in significant concentrations have so far only focused on the effect of P on As(V) toxicity and bioaccumulation, with little attention to the influence of P on As redox transformations. Our study revealed that As(III) oxidation by Synechocystis appeared to be more effective with increased P levels. We demonstrated that the higher As(III) percentage in the medium under P-limited conditions was due to enhanced As(V) uptake and the subsequent efflux of intracellularly reduced As(III) which in turn contributed to higher As(III) concentrations in the medium. Arsenic redox changes by Synechocystis under P-limited conditions is a dynamic cyclic process that includes the following: surface As(III) oxidation (either in the periplasm or near the outer membrane), As(V) uptake, intracellular As(V) reduction, and As(III) efflux. These observations not only expand our understanding of how P influences microbial As redox metabolisms but also provide insights into the biogeochemical coupling between As and P in As contaminated eutrophic aquatic environments and artificial wetland-paddy fields. ■ INTRODUCTIONArsenic (As) is a ubiquitous toxic substance broadly distributed in the environment. 1 The transport and transformation of As in environment are governed by geochemical and biological processes, generating an As biogeochemical cycle. 2 Microbially mediated biotransformations may play an important role in determining As biogeochemistry and toxicity in various natural ecosystems, especially As redox processes which influence the two most abundant inorganic As forms (arsenite As(III) and arsenate As(V)) in the environment. 3 Thus it is essential to understand microbial As redox metabolisms to make further advances in As bioremediation.Microalgae are desirable organisms for As remediation in contaminated water because of their high surface area to volume ratios. 4 Studies have shown that microalgae can tolerate high levels of As and biotransform it in several ways to detoxify it. 5−9 Considering the complex living environments of microalgae, many factors could affect As biotransformations by microalgae. Phosphate (P) is one of the most significant determinants of microalgal growth. Due to its structural similarity with As(V), 10 the influence of P on microbial As metabolisms has been extensively studied and primarily focused on As(V) accumulation and toxicity. 11,12 Besides affecting As(V) uptake, P can further influence the subsequent As detoxification process, i.e. As(V) reduction. 13,14 In the bacteria Agrobacterium tumefaciens str. 5B, it has been reported that As(V) reduction was completely suppressed at elevated levels of P (500 and 1000 μM), but the expression of the As(V) reductase gene (arsC) was not inhibited by high P concentrations. 15 As(III) oxidation and the Phosphorus (Pi) concentration were reported to be tightly and intimately coregulated in the soil bacterium Agrobacterium tumefaciens. 16 However, when analyzing ...

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Section: ■ Materials and Methodsmentioning

confidence: 99%

“…4 Studies have shown that microalgae can tolerate high levels of As and biotransform it in several ways to detoxify it. 5−9 Considering the complex living environments of microalgae, many factors could affect As biotransformations by microalgae.…”

Section: ■ Introductionmentioning

confidence: 99%

Cyanobacteria-Mediated Arsenic Redox Dynamics Is Regulated by Phosphate in Aquatic Environments

Zhang

Rensing

Zhu

2013

Environ. Sci. Technol.

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“…This lets us hypothesize that arsenic exposure could essentially cause the partially formation of oligopeptide-metal complexes, according to a mechanism of detoxication already observed in vegetal and animal organisms for As [33,34] and other pollutants such Cd and Pb [35]. oligopeptide-metal complexes, according to a mechanism of detoxication already observed in vegetal and animal organisms for As [33,34] and other pollutants such Cd and Pb [35]. Figure 7.…”

Section: Non Specific Structural Changes Detected By Ftir Spectroscopmentioning

confidence: 87%

“…oligopeptide-metal complexes, according to a mechanism of detoxication already observed in vegetal and animal organisms for As [33,34] and other pollutants such Cd and Pb [35]. Figure 7.…”

Section: Non Specific Structural Changes Detected By Ftir Spectroscopmentioning

confidence: 94%

Computer Assisted Examination of Infrared and Near Infrared Spectra to Assess Structural and Molecular Changes in Biological Samples Exposed to Pollutants: A Case of Study

Mecozzi

Sturchio

2017

J. Imaging

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Abstract:We present a computer assisted method for the examination of the structural changes present in the probe organism Vicia faba exposed to inorganic arsenic, detected by means of Fourier transform infrared (FTIR) and Fourier transform near infrared (FTNIR) spectroscopy. Like the common ecotoxicological tests, the method is based on the comparison among control and exposed sample spectra of the organisms to detect structural changes caused by pollutants. Using FTIR spectroscopy, we measured and plotted the spectral changes related to the unsaturated to saturated lipid ratio changes (USL), the lipid to protein ratio changes (LPR), fatty and ester fatty acid content changes (FA), protein oxidation (PO) and denaturation, and DNA and RNA changes (DNA-RNA). Using FTNIR spectroscopy, we measured two spectral ranges that belonged to hydrogen bond interactions and aliphatic lipid chains called IntHCONH and Met1overt, respectively. The FTIR results showed that As modified the DNA-RNA ratio and also caused partial protein denaturation in the Vicia faba samples. The FTNIR results supported the FTIR results. The main advantage of the proposed computational method is that it does not require a skilled infrared or near infrared operator, lending support to conventional studies performed by toxicological testing.

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“…As a result of such naturally occurring As and human-induced As concentrations, many groundwater systems greatly exceed the safe As guideline value of 10 μg/L recommended by the World Health Organization (WHO) [6,[9][10][11][12][13]. Thus, the elevated As concentration in groundwaters throughout the world has received much attention recently as a serious threat to public health as well as for agricultural activities [14][15][16].…”

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confidence: 99%

Natural Arsenic in Global Groundwaters: Distribution and Geochemical Triggers for Mobilization

et al. 2016

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The elevated concentration of arsenic (As) in the groundwaters of many countries worldwide has received much attention during recent decades. This article presents an overview of the natural geochemical processes that mobilize As from aquifer sediments into groundwater and provides a concise description of the distribution of As in different global groundwater systems, with an emphasis on the highly vulnerable regions of Southeast Asia, the USA, Latin America, and Europe. Natural biogeochemical processes and anthropogenic activities may lead to the contamination of groundwaters by increased As concentrations. The primary source of As in groundwater is predominantly natural (geogenic) and mobilized through complex biogeochemical interactions within various aquifer solids and water. Sulfide minerals such as arsenopyrite and As-substituted pyrite, as well as other sulfide minerals, are susceptible to oxidation in the near-surface environment and quantitatively release significant quantities of As in the sediments. The geochemistry of As generally is a function of its multiple oxidation states, speciation, and redox transformation. The reductive dissolution of As-bearing Fe(III) oxides and sulfide oxidation are the most common and significant geochemical triggers that release As from aquifer sediments into groundwaters. The mobilization of As in groundwater is controlled by adsorption onto metal oxyhydroxides and clay minerals. According to recent estimates, more than 130 million people worldwide potentially are exposed to As in drinking water at levels above the World Health Organization's (WHO's) guideline value of 10 μg/L. Hence, community education to strengthen public awareness, the involvement and capacity building of local stakeholders in targeting As-safe aquifers, and direct action and implementation of best practices in identifying safe groundwater sources for the installation of safe drinking water wells through action and enforcement by local governments and international water sector professionals are urgent necessities for sustainable As mitigation on a global scale.

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Arsenic uptake by plants and possible phytoremediation applications: a brief overview

Cited by 161 publications

References 93 publications

Cyanobacteria-Mediated Arsenic Redox Dynamics Is Regulated by Phosphate in Aquatic Environments

Cyanobacteria-Mediated Arsenic Redox Dynamics Is Regulated by Phosphate in Aquatic Environments

Computer Assisted Examination of Infrared and Near Infrared Spectra to Assess Structural and Molecular Changes in Biological Samples Exposed to Pollutants: A Case of Study

Natural Arsenic in Global Groundwaters: Distribution and Geochemical Triggers for Mobilization

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