Mapping Cadmium distribution in roots of Salicaceae through scanning electron microscopy with x-ray microanalysis

Cocozza, Claudia; Maiuro, Lucia; Tognetti, Roberto

doi:10.3832/ifor0563-004

Cited by 17 publications

(3 citation statements)

References 38 publications

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“…Contradictory results regarding the influence of Cd in shoot micronutrient concentrations have been published (Yang et al 1996, Larbi et al 2002, Dong et al 2006, Lopez-Millan et al 2009 underlying differences among species as well as the dependence on metal concentrations. In an experimental screening of metal accumulation in roots of four poplar (including I-214) and two willow clones, Cocozza et al (2011) found a positive relationship between Cd and Ca contents in roots suggesting that the accumulation of Cd did not interfere with Ca absorption. Cd may affect water and ion channels and transport of osmotically active compounds (Perfus-Barbeoch et al 2002) and so development of water stress.…”

Section: Discussionmentioning

confidence: 98%

Differential ozone sensitivity interferes with cadmium stress in poplar clones

Castagna¹,

Baccio²,

Tognetti³

et al. 2013

Biologia plant.

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Information on plant responses to combined ozone and cadmium stresses are scarce and limited to herbaceous species. In this research, two poplar clones (I-214 and Eridano), differently sensitive to O 3 , were grown for 5 weeks in pots supplied with 0, 53.5, and 160.5 mg(Cd) kg -1 (soil d.m.) and then exposed to 15-d O 3 fumigation (0.06 mm 3 dm -3 , 5 h a day). The effects of the two stressors, alone or in combination, on Cd, Ca, Fe, and Zn accumulation in above-and below-ground organs, photosynthesis, leaf pigments, and accumulation of H 2 O 2 and NO were investigated. Cadmium induced a reduction in stomatal conductance and a significant accumulation of H 2 O 2 and NO in both clones and negatively affected the carotenoid content in I-214. Ozone, on the other hand, counteracted Cd accumulation in the above-ground organs and significantly increased the xanthophyll de-epoxidation state indicating photoinhibition in O 3 -treated plants. Surprisingly, O 3 alone or in combination with Cd decreased H 2 O 2 accumulation in I-214. The NO production was generally stimulated by Cd, whereas it decreased following O 3 exposure in I-214. The overall data indicate that Cd and O 3 induced clone specific responses. Moreover, when they were applied in combination, antagonistic rather than synergistic effects were observed.

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Section: Discussionmentioning

confidence: 98%

Differential ozone sensitivity interferes with cadmium stress in poplar clones

Castagna¹,

Baccio²,

Tognetti³

et al. 2013

Biologia plant.

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“…However, compared with other ions, the distribution of Cd within the root was preferentially localised in the surroundings of central cylinder. In other experiments with the same Cd concentrations (50 μM) but different poplar genotypes (A4A and I-214 Populus x canadensis Mönch., Poli and 58-861 Populus nigra L.), the same authors (Cocozza et al 2011) showed that I-214 plants were characterised by high Cd contents in the epidermis, whereas 58-861, A4A, and Poli showed high Cd contents in the cortex.…”

Section: Anatomical and Morphological Modificationsmentioning

confidence: 91%

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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“…Tuttavia, le piante esposte ad alte concentrazioni di Cd possono mostrare effetti di tossicità, come clorosi fogliare, inibizione della crescita, riduzione dell'assorbimento d'acqua e di nutrienti, alterazione dell'attività enzimatica, limitazione degli scambi gassosi, senza per questo limitare l'assorbimento del metallo nei vari compartimenti della pianta (Sanità di Toppi & Gabbrielli 1999, Pietrini et al 2003, Cocozza et al 2008, Zacchini et al 2009, Cocozza et al 2011. L'obiettivo del presente studio è stato di valutare la risposta di semenzali di roverella (Quercus pubescens Willd.…”

Section: Abstract: Ecophysiological Characteristics and Cadmium Accumunclassified

Ecophysiological characteristics and cadmium accumulation in Downy Oak (Quercus pubescens Willd.)

Cocozza

Palumbo²,

Colombo³

et al. 2012

Forest@

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IntroduzioneL'inquinamento del suolo e dell'acqua da metalli pesanti, a causa delle attività antropiche, è un problema di primaria importanza a scala globale (KabataPendias & Pendias 1989). Il cadmio (Cd) è fra i metalli pesanti che suscitano maggiori preoccupazioni per la sua diffusione e tossicità nell'ambiente. Il Cd si diffonde nell'atmosfera a seguito della combustione di carburanti di origine fossile oltre che per l'uso di lubrificanti e per il consumo dei pneumatici. L'accumulo e il trasferimento di questo metallo pesante dal suolo alle piante, utilizzate per le produzioni alimentari, possono avere serie implicazioni per la salute dell'uomo (Mench 1998). L'uso di fertilizzanti fosfatici ricchi di Cd ha aumentato sensibilmente la concentrazione di questo elemento nei suoli agricoli, dry soil). The studied photosynthetic parameters (A sat = net phytosynthesis; R day = day respiration; Γ comp = CO 2 compensation point; V cmax = maximum carboxylation rate; J max = electron transport rate; TPU = triose phosphate use; C i /C a = ratio of intercellular (C i ) to ambient (C a ) [CO 2 ] (C i /C a ); J max /V cmax = ratio; (g s max) = maximum stomatal conductance; (l g ) = stomatal conductance estimated relative to the photosynthetic rate; (F v /F m ) = maximum quantum yield of PSII photochemistry; (ΔF/F' m ) = effective photochemical efficiency) varied progressively with increasing Cd concentration in the soil, highlighting a negative impact on photosynthetic potential and PSII functioning. Approximately 10% of added Cd was found to be extractable from the substrate, at the maximum concentration applied, with about 12 and 0.75 as bioaccumulation and translocation factors, respectively. Analogously, Cd accumulated up to 34, 30 and 46 mg kg −1 in leaves, stem and roots, respectively. While it is not possible to extrapolate from the present study with seedlings to effects on mature oak trees, there are clear implications for regeneration in soils contaminated with heavy metals, which may lead to ecosystem deterioration.

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Mapping Cadmium distribution in roots of Salicaceae through scanning electron microscopy with x-ray microanalysis

Cited by 17 publications

References 38 publications

Differential ozone sensitivity interferes with cadmium stress in poplar clones

Differential ozone sensitivity interferes with cadmium stress in poplar clones

Heavy Metals Stress on Poplar: Molecular and Anatomical Modifications

Ecophysiological characteristics and cadmium accumulation in Downy Oak (Quercus pubescens Willd.)

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