Compartmentation of metals in foliage of Populus tremula grown on soils with mixed contamination. I. From the tree crown to leaf cell level

Vollenweider, Pierre; Menard, Terry; Günthardt‐Goerg, Madeleine S.

doi:10.1016/j.envpol.2010.07.013

Cited by 35 publications

(14 citation statements)

References 45 publications

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“…Similarly, toxic effect of Zn resulted in reduced below-and aboveground biomass and/or enhanced accumulation of Zn in different species of poplar (Sebastiani et al, 2004;Utmazian and Wenzel, 2007;Di Baccio et al, 2009;Vollenweider et al, 2011;Stoláriková et al, 2012). However, in the current study it has not been observed direct influence of 1 mM Zn on the growth of poplar clone Lux.…”

Section: Discussioncontrasting

confidence: 69%

Anatomical, biochemical and morphological responses of poplar Populus deltoides clone Lux to Zn excess

Stoláriková-Vaculíková

Romeo

Minnocci

et al. 2015

Environmental and Experimental Botany

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Section: Discussioncontrasting

confidence: 69%

Anatomical, biochemical and morphological responses of poplar Populus deltoides clone Lux to Zn excess

Stoláriková-Vaculíková

Romeo

Minnocci

et al. 2015

Environmental and Experimental Botany

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“…These changes were consistent with physiological impairments (i.e. photosynthesis) and may be explained as adaptive mechanisms to the stress caused by Zn excess Di Baccio et al 2010) Moreover, excess Zn irregularly accumulated inside leaf tissues tended to saturate the veins and stored in cell symplast than apoplast (Vollenweider et al 2011).…”

Section: Anatomical and Morphological Modificationssupporting

confidence: 74%

Heavy Metals Stress on Poplar: Molecular and Anatomical Modifications

Sebastiani

Francini

Romeo

et al. 2013

Approaches to Plant Stress and Their Management

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Heavy metal stress responses vary from plant to plant depending on the type of heavy metals and require a coordinated interplay of complex physiological and biochemical processes, gene expression, protein modification and changes in metabolites compositions leading to proper stress signal and tolerance.Fast-growing tree species, such as poplar, have been studied as possible candidate in phytoremediation approaches to clean up soil or water polluted by organic and inorganic compounds. In particular poplar is known both for the ability to uptake (i.e. phytoextraction) and to stabilise heavy metals (i.e. phytostabilisation) into their tissues, thus reducing the mobility of these contaminants in the soil profile. Compared to other plant species, poplar trees have several advantageous characteristics, such as deeper root system, higher transpiration activity, and productivity. Moreover, they produce economically valuable nonfood biomass exploitable both for wood and bioenergy production. Since the availability of the genome sequence of Populus trichocarpa and the development of highthroughput technologies, poplar has also emerged as the model system for tree biology studies.In this chapter, we examine the effects of heavy metals on anatomical traits and molecular machinery that are responsible for their accumulation and tolerance in poplar. Starting with this deeper molecular information, this chapter could provide new ideas for improving poplar trees with traits conferring heavy metals tolerance.

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“…Reeves (1983) used the term 'plant metal detoxification mechanism' to describe the precipitation of metal elements such as sulphate in the root systems of higher plants when metal elements are at high concentrations (Reeves & Brooks, 1983). Zinc-rich globular precipitates were observed in vacuoles of epidermal and sub-epidermal leaf cells of N. caerulescens at a foliar Zn concentration of 13600 mg kg -1 (Vazquez et al, 1994), and spherical precipitates of Zn were also found in the vacuoles of leaf veins in the Zn hyperaccumulator Populus tremula (Vollenweider et al, 2011b). Zinc deposits appeared in the root cells of N. caerulescens when the total Zn concentration in roots was found to be 10000-18000 mg kg -1 Zn (Lasat et al, 1998).…”

Section: Biochemical Mechanismmentioning

confidence: 99%

“…Zn dilution in the plant because metal uptake was not proportional to increasing biomass is one possible explanation (Lasat et al, 2000;Martínez et al, 2006); there was healthy growth with a rapid increase in shoot biomass in the control and Zn + Pb treatments (1500 to 3000 g), but unhealthy growth for treatments involving Cu. According to Martínez et al (2006) and Vollenweider et al (2011b) the age of the plant is also a significant factor affecting Zn concentrations. The plants in this study were 12 weeks old (84 days old) when treated with heavy metals while in some of the previous experiments reported the plants were younger.…”

Section: Uptake Of Zn In the Presence Of Cu And Pbmentioning

confidence: 99%

“…Zn hyperaccumulator Populus tremula was reported to accumulate Zn preferentially in older foliage where excess Cu and Pb were not translocated, and the excess Zn tended to saturate the veins rather than accumulate inside leaf tissues (Vollenweider et al, 2011b) as is the case in N. caerulescens. Reeves (1983) used the term "plant metal detoxification mechanism" to describe the precipitation of metal elements such as sulphate in the root system of higher plants when metal elements were at high concentration (Reeves & Brooks, 1983).…”

Section: Introductionmentioning

confidence: 99%

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Phytoextraction of zinc by the hyperaccumulator Noccaea caerulescens: accumulation, distribution and multi-element interactions

Dinh¹

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Phytoextraction involves the removal of heavy metals from contaminated sites using hyperaccumulators such as Noccaea caerulescens F.K.Meyer (formerly Thlaspi caerulescens) which is a well-known Zn hyperaccumulator and a model species for hyperaccumulator studies.This PhD thesis investigates the zinc response of the hyperaccumulator in terms of accumulation, distribution and multi-element interactions. The impact of Zn, Pb and Cu on the growth, Zn accumulation and distribution, and interaction between the metals and between the metals and other plant nutrients were examined in soution culture to provide insights into the physiological and biochemical mechanisms of metal hyperaccumulation and detoxification.Noccaea caerulescens were treated with a range of Zn concentrations to investigate uptake, tolerance and distribution of Zn, and these were compared with the responses in a related nonhyperaccumulator, Thlaspi arvense. Noccaea caerulescens showed a high Zn requirement for growth and a higher Zn accumulation and tolerance, with in excess of 2.5 % Zn in the shoot dry mass occurring without visible toxicity symptoms. Thlaspi arvense displayed Zn toxicity symptoms within two weeks of comparable Zn treatment. Increasing shoot Zn concentrations in N.caerulescens reduced Ca and P concentrations by up to 50% and 35%, respectively. Scanning electron microscopy with energy-dispersive X-ray (SEM-EDS) showed that Zn-containing crystals were abundant in leaf epidermal cells and the cortex of the roots during the later growth phase of N. caerulescens.The impact of Pb and Cu on Zn phytoextraction in N. caerulescens was investigated and these metals in solution were found to inhibit both growth and Zn accumulation when present in combination with Zn. Plants were more sensitive to Cu than Pb with Cu being more readily transported to the shoots while almost all Pb was retained in the roots. Concentrations of other essential nutrients such as Ca, Mg, P, S, Fe, and K were decreased in shoots but increased in roots when there was a prolonged period of metal exposure. Higher levels of Zn accumulation decreased the concentrations of Ca, Mg, S and Fe in shoots. Sub-cellular elemental localization analysis using SEM-EDS revealed that Zn accumulated primarily inside the vacuoles of leaf epidermal cells. Znrich crystals were observed in the SEM freeze-dried leaf samples of the control and the Zn plus Pb treatment after extended exposure, but no crystals were found in the cryo-SEM leaf samples.Copper and Pb were not detected in the Zn-rich crystals of the freeze-dried samples or the cryo-SEM samples.ii A fluorescent probe technique was developed and applied to investigate the distribution of Zn ion in fresh plant tissues. Noccaea caerulescens was found to have not only a high capacity for Zn accumulation, but also a high tolerance to Pb. Both these characteristics were more prominent in younger plants. Zinc in combination with Pb had less impact on plant growth than Zn alone. In this thesis, a number of novel techniques were succe...

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Compartmentation of metals in foliage of Populus tremula grown on soils with mixed contamination. I. From the tree crown to leaf cell level

Cited by 35 publications

References 45 publications

Anatomical, biochemical and morphological responses of poplar Populus deltoides clone Lux to Zn excess

Anatomical, biochemical and morphological responses of poplar Populus deltoides clone Lux to Zn excess

Heavy Metals Stress on Poplar: Molecular and Anatomical Modifications

Phytoextraction of zinc by the hyperaccumulator Noccaea caerulescens: accumulation, distribution and multi-element interactions

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