Phytoextraction: a review on enhanced metal availability and plant accumulation

Nascimento, Clístenes Williams Araújo do; Xing, Baoshan

doi:10.1590/s0103-90162006000300014

Cited by 203 publications

(117 citation statements)

References 98 publications

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“…This type of phytoextraction is more advanced and currently commercially implemented (Nascimento and Xing, 2006). A good example of this sort of phytoremediation is that reported for Pb in soil in which EDTA was applied (Salt et al, 1998).…”

Section: Phytoremediationmentioning

confidence: 99%

Tolerance and prospection of phytoremediator woody species of Cd, Pb, Cu and Cr

Almeida

Valle

Mielke

et al. 2007

Braz. J. Plant Physiol.

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High concentrations of Cd, Pb, Cu and Cr can cause harmful effects to the environment. These highly toxic pollutants constitute a risk for aquatic and terrestrial life. They are associated with diverse bioavailable geochemical fractions, like the water-soluble fraction and the exchangeable fraction, and non-available fractions like those associated with the crystalline net of clays and silica minerals. Depending upon their chemical and physical properties we can distinguish different mechanisms of metal toxicity in plants, such as production of reactive oxygen species from auto-oxidation, blocking and/or displacement of essential functional groups or metallic ions of biomolecules, changes in the permeability of cellular membranes, reactions of sulphydryl groups with cations, affinity for reactions with phosphate groups and active groups of ADP or ATP, substitution of essential ions, induction of chromosomal anomalies and decrease of the cellular division rate. However, some plant species have developed tolerance or resistance to these metals naturally. Such evolution of ecotypes is a classic example of local adaptation and microevolution, restricted to species with appropriate genetic variability. Phytoremediator woody species, with (i) high biomass production, (ii) a deep root system, (iii) high growth rate, (iv) high capacity to grow in impoverished soils, and (v) high capacity to allocate metals in the trunk, can be an alternative for the recovery of degraded soils due to excess of metallic elements. Phytoremediation using woody species presents advantageous characteristics as an economic and ecologically viable system, making it an appropriate, practical and successful technology. Key-words: decontamination, heavy metals, hyperaccumulation, phytodegradation, phytostabilization, phytotoxicity Tolerância e prospecção de espécies lenhosas fitorremediadoras de Cd, Pb, Cu e Cr: Altas concentrações de Cd, Pb, Cu e Cr podem provocar efeitos danosos ao ambiente. Esses poluentes altamente tóxicos constituem um risco para a vida aquática e terrestre. Encontram-se associados às diversas frações geoquímicas biodisponíveis, a exemplo da fração solúvel em água e da fração trocável, e as não disponíveis como a fração associada à rede cristalina de argilas e de minerais silicatados. Conforme as suas propriedades químicas e físicas podem-se distinguir mecanismos diferentes de toxicidade de metais em plantas, tais como produção de espécies reativas de oxigênio pela auto-oxidação, bloqueio e, ou, deslocamento de grupos funcionais ou de íons metálicos essenciais de biomoléculas, mudanças na permeabilidade de membranas celulares, reações de grupos sulfidrílicos com cátions, afinidade para reações com grupos fosfatos e grupos ativos de ADP ou ATP, substituição de íons essenciais, indução de anomalias cromossomais e decréscimo da taxa de divisão celular. Várias espécies vegetais desenvolveram, naturalmente, tolerância ou resistência a esses metais. Essa evolução de ecótipos é exemplo clássico de adaptação local e de microevolução,...

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Section: Phytoremediationmentioning

confidence: 99%

Tolerance and prospection of phytoremediator woody species of Cd, Pb, Cu and Cr

Almeida

Valle

Mielke

et al. 2007

Braz. J. Plant Physiol.

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“…Due to the potential toxicity and high persistence of metals, soils polluted with these elements are an environmental problem that requires an effective and affordable solution (Nascimento and Xing, 2006). Phytoextraction was developed in the framework of an intense research effort for more efficient, cheaper and Sci.…”

Section: Introductionmentioning

confidence: 99%

“…), v.67, n.6, p.713-719, November/December 2010 less hazardous techniques to remediate contaminated soils. It consists in the removal of metals by plants through uptake and accumulation into biomass (Nascimento and Xing, 2006). Interestingly, phytoremediation was recognized and documented by humans more than 300 years ago, however the scientific study and development of suitable plants was not conducted until the early 1980's (Lasat, 2000).…”

Section: Introductionmentioning

confidence: 99%

“…The capacity to hyperaccumulate metals is a relatively rare phenomenon in the plant kingdom, occurring in approximately 400 species of vascular plants total (Reeves and Baker, 1999). The vast majority of the hyperaccumulator species discovered so far are Ni hyperaccumulator (Nascimento and Xing, 2006). Plant species that can accumulate Cd, Pb, Zn, Co, As and Cu are much less numerous (McGrath et al, 2001).…”

Section: Introductionmentioning

confidence: 99%

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Vegetable species for phytoextraction of boron, copper, lead, manganese and zinc from contaminated soil

Santos

Rodella²,

Abreu

et al. 2010

Sci. agric. (Piracicaba, Braz.)

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Phytoremediation is an attractive option to remove metal from contaminated soil since it is a simple, low-cost, and environmentally friendly procedure. To better examine the phytoremediation potential of kenaf (Hybiscus canabinnus), mustard (Brassica juncea), turnip (Raphunus sativus) and amaranth (Amaranthus crentus) plants, a greenhouse experiment was performed in which these species were grown on a soil contaminated with Zn, Cu, Mn, Pb and B. The translocation, the bioconcentration and the removal index, the transference factor and the time to reach 50% of element removal from soil, among other indicators, were used in order to identify a hyperaccumulator. Kenaf plants were more tolerant to the conditions tested, with the highest dry matter production and no visual toxicity symptoms. Amaranth would be the species chosen to remediate the soil under field conditions as it presented the higher indexes for decontamination of Zn and Mn and was also able to remove B. Turnip showed the best results for Pb removal. All species tested were able to remove B from soil. In spite, none of the plant species tested could be characterized as a hyperaccumulator.

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“…Esta espécie tem sido considerada por diversos pesquisadores Pence et al, 2000;Reeves & Baker, 2000;Salt et al, 2000;Schat et al, 2000;Assunção et al, 2001;Guerinot & Salt, 2001;Lasat, 2002;Assunção et al, 2003;Cobbet, 2003;Prasad & Freitas, 2003;Nascimento & Xing, 2006;Guimarães et al, 2009) como modelo para estudos em fitorremediação, podendo acumular metais como Cd 2+ , Ni 2+ e Zn 2+ de 100 até 1.000 vezes mais do que os níveis encontrados no solo. Devido a essa característica, T. caerulescens tem sido largamente utilizada em estudos objetivando identificar as bases moleculares dos mecanismos de tolerância e acumulação de metais pesados.…”

Section: Introductionunclassified

Influência de temperatura, luz e giberelina na germinação de sementes de Thlaspi caerulescens J. Presl & C. Presl (Brassicaceae)

Guimarães

Vidigal

Loureiro³

et al. 2010

Rev. Ceres

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Influence of temperature, light and giberelic acid on seed germination of Thlaspi caerulescens J & C Presl (Brassicaceae)Thlaspi caerulescens is a natural zinc (Zn), cadmium (Cd) and nickel (Ni) hyperaccumulator, a model species to study heavy metal hyperaccumulation and tolerance. However, the quick loss of viability under storage and the low production of seeds under non temperate climates justify the need to identify conditions to maximize germination and seed vigor. In order to characterize better conditions for germination, seeds of T. caerulescens were incubated under a photoperiod of 8h light/16h dark (15 mmol.m -2 .s -1 ) or in darkness, at temperatures of 10, 15, 20 and 25°C. The assays were performed with germination paper wetted with 0,05% giberelic acid or distillated water. Percentage of germination (G%), and germination speed index (GSI) were evaluated. The highest percentage of germination (66%) was recorded for the treatments with GA at the temperatures of 15 and 20ºC. The highest GSI was recorded for the treatments with GA at 15º and 20ºC, independent of the light effect. The highest germination and germination speed index for T. caerulescens were obtained with the GA 3 treatment, under light, and temperatures between 15 and 20ºC.

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Phytoextraction: a review on enhanced metal availability and plant accumulation

Cited by 203 publications

References 98 publications

Tolerance and prospection of phytoremediator woody species of Cd, Pb, Cu and Cr

Tolerance and prospection of phytoremediator woody species of Cd, Pb, Cu and Cr

Vegetable species for phytoextraction of boron, copper, lead, manganese and zinc from contaminated soil

Influência de temperatura, luz e giberelina na germinação de sementes de Thlaspi caerulescens J. Presl & C. Presl (Brassicaceae)

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