Chemical speciation and cellular deposition of lead in <i>Sesbania drummondii</i>

Sharma, Nilesh; Gardea‐Torresdey, Jorge L.; Parsons, Jasón G.; Sahi, Shivendra V.

doi:10.1897/03-540

Cited by 61 publications

(37 citation statements)

References 29 publications

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“…The localization of Pb ions mainly observed in the root xylem suggests that it is the main pathway of Pb transport from root to shoot. Similar observations were also reported by Sharma et al ([2004]).…”

Section: Discussionsupporting

confidence: 92%

Lead heavy metal toxicity induced changes on growth and antioxidative enzymes level in water hyacinths [Eichhornia crassipes (Mart.)]

et al. 2014

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BackgroundLead (Pb) heavy metal pollution in water bodies is one of the serious problems across the world. This study was designed to find out the effect of Pb toxicity on physiological and biochemical changes in Eichhornia crassipes (water hyacinth) seedlings.ResultsThe plant growth was significantly inhibited (50%) at 1000 mg/L Pb concentration. Accumulation of Pb was higher in root than in shoot tissues. The maximum level of Pb accumulation was noticed in roots (5.45%) followed by petiole (2.72%) and leaf tissues (0.66%). Increasing the Pb concentration gradually decreased the chlorophyll content. Intracellular distribution of Pb was also studied using SEM-EDX, where the Pb deposition was observed in both root and leaf tissues. MDA content increased in both the leaf and root tissues up to the 400 mg/L Pb treatment and slightly decreased at higher concentrations. The activity of antioxidative enzymes, such as APX and POX, positively correlated with Pb treatment, while in the case of SOD and CAT enzymes increased up to 800 mg/L treatment and then slightly decreased at higher concentration in both leaf and root tissues.ConclusionsThese results suggest that water hyacinth plants have efficient mechanism to tolerate Pb toxicity, as evidenced by an increased level of antioxidative enzymes. Results clearly indicate that water hyacinth is a feasible plant for hyperaccumulation of heavy metals from polluted wetlands.Electronic supplementary materialThe online version of this article (doi:10.1186/s40529-014-0054-6) contains supplementary material, which is available to authorized users.

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Section: Discussionsupporting

confidence: 92%

Lead heavy metal toxicity induced changes on growth and antioxidative enzymes level in water hyacinths [Eichhornia crassipes (Mart.)]

et al. 2014

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“…Our results are compatible to the earlier studies using alfalfa plants in respect of XANES spectra (9) but unique in LC-XANES features. LC-XANES fittings have been used to identify the different species of metals present in plants with a high degree of certainty (9,14).…”

Section: Resultsmentioning

confidence: 99%

Synthesis of Plant-Mediated Gold Nanoparticles and Catalytic Role of Biomatrix-Embedded Nanomaterials

Sharma

Sahi

Nath

et al. 2007

Environ. Sci. Technol.

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353

210

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Growth of Sesbania seedlings in chloroaurate solution resulted in the accumulation of gold with the formation of stable gold nanoparticles in plant tissues. Transmission electron microscopy revealed the intracellular distribution of monodisperse nanospheres, possibly due to reduction of the metal ions by secondary metabolites present in cells. X-ray absorption near-edge structure and extended X-ray absorption fine structure demonstrated a high degree of efficiency for the biotransformation of Au(III) into Au(0) by plant tissues. The catalytic function of the nanoparticle-rich biomass was substantiated by the reduction of aqueous 4-nitrophenol (4-NP). This is the first report of gold nanoparticle-bearing biomatrix directly reducing a toxic pollutant, 4-NP.

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“…4) however, Shao et al (2007) showed that Cd-induced oxidative stress in rice is alleviated by Fe. Fe is an integral cofactor of antioxidant enzymes such as catalase and ascorbate peroxidase (Sharma et al 2004). As such, the maintenance of high levels of Fe in the roots when Cd concentrations were highest can increase the activity of these enzymes, and would be an important defense mechanism against ROS generated by Cd-stress (Wang et al 2013).…”

Section: Micronutrient Contentsmentioning

confidence: 99%

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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Chemical speciation and cellular deposition of lead in Sesbania drummondii

Cited by 61 publications

References 29 publications

Lead heavy metal toxicity induced changes on growth and antioxidative enzymes level in water hyacinths [Eichhornia crassipes (Mart.)]

Lead heavy metal toxicity induced changes on growth and antioxidative enzymes level in water hyacinths [Eichhornia crassipes (Mart.)]

Synthesis of Plant-Mediated Gold Nanoparticles and Catalytic Role of Biomatrix-Embedded Nanomaterials

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

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