Fitotoxidez de cádmio para Eucalyptus maculata e E. urophylla em solução nutritiva

Soares, Cláudio Roberto Fonsêca Sousa; Siqueira, José Oswaldo; Carvalho, Janice Guedes de; Moreira, F. M. S.

doi:10.1590/s0100-67622005000200001

Cited by 34 publications

(28 citation statements)

References 13 publications

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“…At the end of the experimental period the plants were wilted and had yellowed leaves and blackened roots. Similar results were seen with Eucalyptus urophylla and E. maculate, both of which are considered to be Cd-tolerant at 90 µmol Cd (Soares et al 2005); and visual symptoms of toxicity occurred at doses of 25 µmol Cd (Lagriffoul et al 1998) in maize plants. According to Breckle & Kahle (1992), these symptoms may be associated with multiple deficiencies of several nutrients essential to the formation, expansion, and operation of chloroplasts and with Cd-phytotoxic effects on extensibility or synthesis of cell wall materials (Barceló & Poschenrieder 1992).…”

Section: Resultssupporting

confidence: 56%

Cadmium effects on mineral nutrition of the Cd-hyperaccumulator Pfaffia glomerata

2013

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A plant's ability to survive in a stressful environment is correlated with its nutritional status, which can be affected by cadmium (Cd) uptake. The present study evaluated the influence of Cd on the concentrations and distributions of nutrients in the roots and shoots of the Cd-hyperaccumulator Pfaffia glomerata (Sprengel) Pedersen. Plantlets were cultivated in nutrient solutions containing increasing Cd concentrations during 20 days under greenhouse conditions, and the concentrations of Cd and essential macro-(N, P, K, Ca, Mg and S) and micro-(Zn, Fe, Mn, Cu) elements in the roots and shoots were subsequently determined. Cd did not affect the plant biomass production. Cd accumulation was found to be higher in roots than in shoots, and influenced the distribution of macro and micro elements in those plants. Despite the high phytotoxicity of this element, our results indicated the existence of Cd-tolerance mechanisms in both nutrient uptake and distribution processes that enabled these plants to survive in Cd-contaminated sites.

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Section: Resultssupporting

confidence: 56%

Cadmium effects on mineral nutrition of the Cd-hyperaccumulator Pfaffia glomerata

2013

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“…With the increase in concentrations of Cd, the height, leaf area and dry matter mass of stems and leaves decreased (Tables 1 and 2). The growth of eucalyptus species was also reduced with the increase in concentrations of Cd (SOARES et al, 2005) and barley plants exposed to this metal suffered a decrease in growth (GUO et al, 2004). It is known that Cd can reduce the stem growth due to the suppression of cell elongation (SANITÀ DI TOPPI; GABRIELLI, 1999).…”

Section: Methodsmentioning

confidence: 99%

Tolerance to cadmium in the germination and development of jack beans

Rossi¹,

Lagôa²,

Schiavinato³

2012

RCA

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Cadmium (Cd) is a metal that contaminates the environment mainly through agroindustrial, metallurgical and chemical industrial activities. It can affect mineral absorption by plants, the stomatal aperture, photosynthesis and water balance by reducing the crop yield. Aiming at the discovery of new species able to tolerate Cd, this study evaluated the germination and development of jackbean plants in the presence of Cd to determine whether there is tolerance to this metal. Seeds and seedlings of this species were grown in plastic pots containing sand with Cd concentrations of 0, 500 and 2000 µmol L -1 applied as CdCl 2 .2.5H 2 O. The experiments were conducted in a greenhouse under natural photoperiod conditions. Percent germination was close to 100% 13 days after sowing. Seedlings accumulated much of the applied Cd in the shoot and produced high biomass. No alterations to the photosynthetic apparatus were observed at the lower concentrations. This indicates that jack bean plants exhibit characteristics of tolerance to Cd and that further studies should be performed to report if this species can be used as phytoremediator. RESUMO: O cádmio (Cd) é um metal que contamina o ambiente principalmente por meio das atividades agroindustriais, metalúrgicas e químicas. Ele pode afetar a absorção de minerais pelas plantas, a abertura estomática, a fotossíntese e o balanço hídrico diminuindo a produção vegetal. Visando à descoberta de novas espécies capazes de tolerar o Cd

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“…Shoot and root CDS 10 values were 47.92 and 20.48 mmol Cd L -1 , respectively, and they were much higher than those reported for other plants considered to be Cd-tolerant and used in Cd-phytoremediation programs in Brazil. CDS 10 levels of 2.4 and 1.5 mmol Cd L -1 in shoots and 9.0 and 6.4 mmol Cd L -1 in roots were reported for Eucalyptus maculate and E. urophylla, respectively (Soares et al, 2005); shoot CDS 10 in Cedrela fissilis was reported to be 6.7 mmol L -1 (Paiva et al, 2000). The CDS 10 of Pfaffia glomerata was about four to nine times higher than seen in these other species.…”

Section: Antioxidant Enzyme Activitiesmentioning

confidence: 99%

Cd-tolerance markers of Pfaffia glomerata (Spreng.) Pedersen plants: anatomical and physiological features

Gomes

Marques

Martins

et al. 2012

Braz. J. Plant Physiol.

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Physiological and anatomical features of Cd-tolerance in Pfaffia glomerata were examined by exposing plantlets to nutrient solutions with increasing Cd concentrations (0, 15, 45, and 90 µmol Cd L -1 ), and possible Cd-tolerance markers were established. Cd contents were found to be higher in roots than in shoots. According to the bioconcentration factor data, this species is effectively a Cd-hyperaccumulator, as previously attested. Cd induced the appearance of xeromorphic characteristics in leaves (decreased water potential, increased numbers and decreased stomata size) and increased root endodermis thickness. The enzymatic antioxidant systems of roots and leaves were differently affected by Cd. The coordinated activities of antioxidant enzymes were effective in reducing Cd-induced reactive oxygen species in plants, mainly in leaves. Root endodermis thickness, stomatal size and numbers, root superoxide dismutase, and guaiacol peroxidase, as well as leaf guaiacol peroxidase and catalase activities can all be considered Cd-tolerance markers in Pfaffia glomerata. Due to its high root Cd accumulation, Pfaffia glomerata may be useful in Cd-phytoextraction programs, however the pharmacological use of plants grown in the presence of Cd must be avoided.

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Fitotoxidez de cádmio para Eucalyptus maculata e E. urophylla em solução nutritiva

Cited by 34 publications

References 13 publications

Cadmium effects on mineral nutrition of the Cd-hyperaccumulator Pfaffia glomerata

Cadmium effects on mineral nutrition of the Cd-hyperaccumulator Pfaffia glomerata

Tolerance to cadmium in the germination and development of jack beans

Cd-tolerance markers of Pfaffia glomerata (Spreng.) Pedersen plants: anatomical and physiological features

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