Heavy metals in plants and phytoremediation

Cheng, Shuiping

doi:10.1065/espr2002.11.141.3

Cited by 123 publications

(66 citation statements)

References 2 publications

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“…They also play an important role in the structural and functional aspects of aquatic ecosystems by altering water movement regimes (flow and wave impact conditions), providing shelter to fish and aquatic invertebrates and serving as a food source, and altering water quality by regulating oxygen balance, nutrient cycle, and accumulating heavy metals Dhote and Dixit 2009). Their ability to hyperaccumulate heavy metals make them interesting research candidates especially for the treatment of industrial effluents and sewage waste water (Mkandawire et al 2004;Arora et al 2006;Upadhyay et al 2007;Mishra et al 2009;Rai 2010a).The potential of aquatic marcophytes for heavy metal removal has been investigated and reviewed extensively (Brooks and Robinson 1998;Cheng 2003;Prasad and Freitas 2003;Suresh and Ravishankar 2004;Srivastva et al 2008;Dhir et al 2009a;Dhote and Dixit 2009;Marques et al 2009;Rai 2009). Table 2 summarizes the recent literature on phytoremediation potential of some macrophytes.…”

Section: Aquatic Macrophytes and Their Potential To Accumulate Heavy mentioning

confidence: 99%

Phytoremediation Potential of Aquatic Macrophyte, Azolla

Sood

Uniyal

Prasanna

et al. 2011

AMBIO

250

123

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Aquatic macrophytes play an important role in the structural and functional aspects of aquatic ecosystems by altering water movement regimes, providing shelter to fish and aquatic invertebrates, serving as a food source, and altering water quality by regulating oxygen balance, nutrient cycles, and accumulating heavy metals. The ability to hyperaccumulate heavy metals makes them interesting research candidates, especially for the treatment of industrial effluents and sewage waste water. The use of aquatic macrophytes, such as Azolla with hyper accumulating ability is known to be an environmentally friendly option to restore polluted aquatic resources. The present review highlights the phytoaccumulation potential of macrophytes with emphasis on utilization of Azolla as a promising candidate for phytoremediation. The impact of uptake of heavy metals on morphology and metabolic processes of Azolla has also been discussed for a better understanding and utilization of this symbiotic association in the field of phytoremediation.

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Section: Aquatic Macrophytes and Their Potential To Accumulate Heavy mentioning

confidence: 99%

Phytoremediation Potential of Aquatic Macrophyte, Azolla

Sood

Uniyal

Prasanna

et al. 2011

AMBIO

250

123

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“…Generally, the contents of heavy metals in the underground parts are higher than those found in the parts above the ground and follows a pattern of root>leaf>shoot (stem)>fruit and lateral root>main root, old leaf>young leaf (Cheng, 2003). Metals accumulated in plant tissues can cause toxic effects, especially when translocated to above ground tissues.…”

Section: Distribution and Speciation Of Heavy Metals In Plantsmentioning

confidence: 99%

“…Concentrations of metals in the cell walls were also higher than in intracellular locations (Weis & Weis, 2004). The distribution and accumulation of heavy metals in plants is related to plant species, element species, chemical and bioavailability, and a number of environmental conditions such as redox, pH, cation exchange capacity, dissolved oxygen and temperature (Cheng, 2003;Weis & Weis, 2004). The tolerance of plants to heavy metals and the accumulation are depended on various physiological factors such as uptake and leakage of metal ions by roots, root cation exchange capacity (CEC), phytochelatin production, antioxidative stress, carbohydrate production and utilization (Suresh & Ravishankar, 2004).…”

Section: Distribution and Speciation Of Heavy Metals In Plantsmentioning

confidence: 99%

Advances in Phytoremediation Research: A Case Study of Gynura Pseudochina (L.) DC.

Nakbanpote¹,

Paitlertumpai²,

Sukadeetad³

et al. 2010

Advanced Knowledge Application in Practice

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Phytoremediation is the process through which contaminated land is ameliorated by growing plants that have the ability to remove the contaminating chemicals. The processes in phytoremediation include phytodegradation, phytostabilization, phytovolatilization and rhizofiltration. In addition, the association of plant and microorganism in the rhizosphere seems to enhance removal of the contaminants. Although relatively slow, phytoremediation is environmentally friendly, cheap, requires little equipment or labor, is easy to perform, and sites can be cleaned without removing the polluted soil; it is an in situ method. In addition, precious metals, such as gold, zinc and chromium, collected by the hyperaccumulator can be harvested and extracted as phytoextraction. However, the key factor for successful phytoremediation is identification of a plant that is tolerant and suitable for each area, one which can accumulate high concentrations of the required metal. In addition, the mechanism of heavy metal accumulated in the plant should be studied before the application. Advance research in phytoremediation has been focused on the analysis of the distribution and speciation of metals accumulated in the hyperaccumulative plant by using synchrotron radiation and the techniques of micro-X-ray fluorescence imaging (µ-XRF imaging) and X-ray adsorption fine edge structure (XAFS). Expression of metal-inducible proteins in plant such as glutathione, methallothionine and heat-shock proteins have been extracted by various suitable extraction buffers, separated and purified by the techniques of dialysis, chromatography and gel electrophoresis. Then, the amino acid sequences, the crystal structures of proteins, and the status of the metal bound in the proteins have been studied. In addition, the microorganisms in the rhizosphere of metal hyperaccumulative plants have been investigated by isolating the bacteria that are tolerant to heavy metals and contain plant growth promoting properties; such as nitrogen fixation, phosphate solubilization, indole-3-acetic acid (IAA) phytohormone and 1-aminocyclopropane-1-carboxylate (ACC) deaminase production, etc. Finally, the plant design for successful phytoremediation in any contaminated area should be concerned with ground water, running off, geology and the effect of growing the plant on biodiversity. Especially, harvesting management and byproduct utilization should be studied and investigated to convince local people and government of the usefulness of phytoremediation.

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“…Pb-contaminated soils adversely affect various plant processes and can lead to a sharp decrease in crop productivity (Moustakas et al 1994). The largest contribution of Cd to the plant is in exchangeable form, while residual form is seen to be most prevalent for Pb and Zn (Cheng 2003). Nabulo et al (2008) revealed that higher levels of plants trace metals, including Zn, Cu, Pb and Ni, were accumulated in root rather than in rhizome, and the least amount was accumulated in leaf.…”

Section: Introductionmentioning

confidence: 99%

Assessment of cadmium, zinc and lead contamination in leaf and root of four various species

Fatemitalab

Zare

Kardar

2016

Int. J. Environ. Sci. Technol.

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Heavy metals toxicity is a significant problem for ecological, evolutionary, nutritional and environmental reasons. This study was carried out to evaluate the amount of cadmium, zinc and lead absorption in leaf and root of pine, cypress, plantain and ash in Isfahan, Iran, in 2013. For this purpose, three heavy metals (Cd, Pb and Zn) and three sites (heavy traffic, moderate traffic and control) were chosen based on their effects on human health. The results indicated that the highest and lowest lead and cadmium concentrations belonged to heavy traffic site and control site, respectively. Cd in leaf versus Pb in leaf and Cd in root versus Pb in root had the highest correlation coefficient among the traits indicating positive influence of leaf and root on absorbing Cd and Pb from soil, water and air. In all the studied species, the concentration of Pb was higher than that of Cd and Zn. This was certainty due to the vehicle traffic emitting much more lead than cadmium and zinc. In all the studied species, metal concentration in leaves was higher than in roots, which may be due to high concentration of heavy metals in air than in soil. In this study, Pinus eldarica Medw. tree was found to be the best species to monitor polluted sites in Isfahan city.

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Heavy metals in plants and phytoremediation

Cited by 123 publications

References 2 publications

Phytoremediation Potential of Aquatic Macrophyte, Azolla

Phytoremediation Potential of Aquatic Macrophyte, Azolla

Advances in Phytoremediation Research: A Case Study of Gynura Pseudochina (L.) DC.

Assessment of cadmium, zinc and lead contamination in leaf and root of four various species

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