Chelated lead transport in Pinus radiata: an ultrastructural study

Jarvis, Martin D.; Leung, David W. M.

doi:10.1016/s0098-8472(02)00005-9

Cited by 88 publications

(40 citation statements)

References 28 publications

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“…Similar results were obtained for Carex rostrata, Eriophorum angustifolium and Phragmites australis grown in hydroponics (Stoltz and Greger, 2002). A high capacity for Pb retention in the roots with restricted translocation to the shoots was reported for Helianthus annus L. (Romeiro, 2005), Pinus radiata (Jarvis and Leung, 2002), spinach (Tsen et al, 2002) and Prosopis spp. (Aldrich et al, 2004).…”

Section: Resultssupporting

confidence: 77%

Lead uptake and tolerance of Ricinus communis L.

Romeiro¹,

Lagôa²,

Furlani

et al. 2006

Braz. J. Plant Physiol.

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Phytoextraction is an important technique used for the decontamination of areas polluted by lead. Consequently, an understanding of the physiological responses to tolerance of tropical species subjected to increasing levels of contamination is fundamental before considering their use as phytoextractors in contaminated areas. The objective of this study was to assess the lead (Pb) uptake and the tolerance of Ricinus communis L. The plants were cultivated in nutrient solution in a greenhouse under controlled conditions. Lead was tested at concentrations of 0, 100, 200 and 400 µmol L -1 . The experimental set-up was a block design, using a 4 x 1 factorial scheme, with three replicates. Biometric analyses, photosynthesis rates, and Pb content in the nutritive solution as well as in roots and shoots were performed. In conclusion, R. communis L is a hyperaccumulator species for Pb and presents tolerance properties in lead light concentration. Lead uptake and tolerance of Ricinus communis L. Pontencial fitoextrator de Ricinus communis L. para chumbo:A fitoextração é uma técnica remediadora importante para áreas contaminadas por chumbo (Pb), sendo importantes os estudos que relacionam a tolerância de espécies de clima tropical, desenvolvidas em níveis crescentes de contaminação, com a sua fisiologia, para que possam ser cultivadas como fitoextratoras em áreas contaminadas. Este trabalho teve o objetivo de estudar a espécie Ricinus communis L. como potencial fitoextratora de Pb. As plantas foram cultivadas em solução nutritiva, em casa de vegetação, sob condições semi-controladas. Testaram-se as concentrações 0, 100, 200 e 400 µmol Pb L -1 . Os experimentos foram instalados em blocos ao acaso, em esquema fatorial 4 x 1, com três repetições. Foram realizadas análises biométricas e medidas as taxas de fotossíntese, bem como as concentrações de Pb na solução nutritiva, nas raízes e na parte aérea das plantas. Concluiu-se que R. communis L é uma espécie hiperacumuladora e apresenta tolerância ao Pb em baixas concentrações.Palavras-chave: chumbo, fitorremediação, mamona, metal pesado

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Section: Resultssupporting

confidence: 77%

Lead uptake and tolerance of Ricinus communis L.

Romeiro¹,

Lagôa²,

Furlani

et al. 2006

Braz. J. Plant Physiol.

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“…Most of the Pb absorbed by plants accumulates in roots, and only a small fraction is translocated to the aerial part (Patra et al, 2004). The retention of Pb in the roots is due to binding to ion exchange sites and extracellular precipitation, mainly in the form of Pb carbonates, with both these mechanisms occurring in the cell wall (Jarvis and Leung, 2002). However, Pb does not always penetrate the root endoderm and enter the stele.…”

Section: Effect Of Metals On Nutrition and Metabolism Of Plantsmentioning

confidence: 99%

“…This process is based on the genetic and physiological capacities of some plants to accumulate, translocate and resist high metal concentrations. However, there are the disadvantages of low biomass production and slow growth, as well as lack of hyperaccumulator plants for the more important metallic pollutants in the environment, like Pb and Cd (Jarvis and Leung, 2002). Even so, some plant species are actually used for phytoextraction of Cd, Cu, Pb and Cr (Baker et al, 1991).…”

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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“…Addition of VC was presumed to mobilize the Pb in the rhizosphere by producing organic acids having lower molecular weight, responsible for formation of organic ligands. Accumulation of Pb in root might be attributed to binding of this metal to exchange sites mainly in the form of lead carbonates with the mechanisms occurring in the cell walls (Jarvis and Leung 2002). Vermicompost favours phytoextraction of Pb as a high source of organic matter through production of phytochelatin.…”

Section: Resultsmentioning

confidence: 99%

Enhanced clean-up of lead-contaminated alluvial soil through Chrysanthemum indicum L.

Mani

Kumar

Patel

et al. 2014

Int. J. Environ. Sci. Technol.

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The natural potential of Chrysanthemum indicum L. for the clean-up of lead-contaminated soil was investigated under pot experiment. Maximum applied lead (at 50 mg/kg) caused significant reduction in the plant height (31.71 %), root length (31.15 %) and dry biomass (32.71 and 41.25 % for root and shoot, respectively); however, minimum applied lead (at 10 mg/kg) promoted the growth of plants to some extent, over the respective control pots. Lead concentration in the tissues followed the order as root[shoot[flower. The combinatorial treatment T 16 (50 mg/kg Pb, 0.8 g/kg elemental sulphur and 6 g/kg vermicompost) caused maximum concentration of lead in root, shoot and flower up to the extent of 43.58, 22.45 and 9.62 mg/kg, respectively, leading to the maximum bioaccumulation factor (0.38). However, the combinatorial treatment T 4 (sulphur and vermicompost) showed maximum translocation factor (0.63) and T 12 (20 mg/kg lead, 0.8 g/kg elemental sulphur and 6 g/kg vermicompost) produced maximum remediation ratio (0.153). The combinatorial treatments under lead-contaminated (10-50 mg/ kg) soils showed higher remediation efficiency indicating enhanced clean-up of the aforesaid soils through C. indicum L. Applied lead ([20 mg/kg) altered the chlorophylla, chlorophyll-b and carotenoid contents of the plants. Hence, the authors conclude that a non-edible ornamental plant, C. indicum L., is preferred to be safely grown in moderately lead-contaminated soils along with application of elemental sulphur and vermicompost, which will boost the photosynthetic pigments of the plants, leading to enhanced clean-up of the lead-contaminated soil.

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Chelated lead transport in Pinus radiata: an ultrastructural study

Cited by 88 publications

References 28 publications

Lead uptake and tolerance of Ricinus communis L.

Lead uptake and tolerance of Ricinus communis L.

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

Enhanced clean-up of lead-contaminated alluvial soil through Chrysanthemum indicum L.

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