An overview of heavy metal challenge in plants: from roots to shoots

DalCorso, Giovanni; Manara, Anna; Furini, Antonella

doi:10.1039/c3mt00038a

Cited by 247 publications

(108 citation statements)

References 172 publications

(183 reference statements)

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“…The cell wall plays a key role in the immobilization as well as uptake of toxic heavy metal ions into the cytosol by providing histidyl groups, pectic sites, and extracellular carbohydrates such as mucilage and callose. Composition of cell wall is the characteristic of a specific plant genotype (DalCorso et al 2013). Thus, different plant genotypes possessing chemically distinct root cell walls have dissimilar sensitivities to a specific metal toxicity.…”

Section: Metal Ion Binding To the Cell Wallmentioning

confidence: 99%

Heavy Metal Uptake and Transport in Plants

2015

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Plants have developed different biochemical systems to overcome the heavy metalinduced stresses. An increase in the metal ion concentration in soil, metallothioneins, stress proteins, etc. results into reactive oxygen species (ROS) production that ultimately leads to programmed cell death. To deal with such problems, plants have developed certain defense mechanisms or adaptation strategies including restriction of metal ion uptake, metal export from the plant, chelation and compartmentalization, etc. These processes involve metal transporters, i.e., copper transporter family, ZIP (ZRT-IRT-like protein) family, NRAMP (natural resistance-associated macrophage protein) family of transporters, MATE (multidrug and toxic compound extrusion) protein transporters, HMA (heavy metal ATPase) transporters, oligopeptide transporters, ABC (ATP-binding cassette) family of transporters, and cation-diffusion facilitator family of transporters. These transporters act through a series of signaling events like phosphorylation cascades, hormones, mitogen-activated protein kinases, and calcium-calmodulin systems, ultimately leading to the balance of nutrients in the plant necessary for its survival.Trace quantities of some heavy metals are essential for plant metabolism; however, at higher concentration they are potentially toxic to plants and soil ecosystem (Nagajyoti et al. 2010). Applying inorganic fertilizers leads to the buildup of metals in soils (Li et al. 2010b). Soil and sediments obtained from

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Section: Metal Ion Binding To the Cell Wallmentioning

confidence: 99%

Heavy Metal Uptake and Transport in Plants

2015

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“…Metal cations such as Cd 2+ induce NADPH oxidase activity in contacted cell membranes and a rise in the production of reactive oxygen species (ROS) [87] that damage cellular components such as lipids, proteins, carbohydrates, and DNA [88][89][90][91]. ROS incited signals expressed in formation and modulation of mitogen-activated protein kinases (MAPKs), Ca 2+ /calmodulins, nitric oxide, and the common plant hormones alter nuclear gene expression and the formation of cation-neutralizing chelants to control the cellular redox status [92][93][94][95]. Nevertheless, similar plant signaling responses specifically attributable to the presence of a unique (non-essential) element are poorly documented.…”

Section: Discrimination Of Essential and Non-essential Elements Maskementioning

confidence: 99%

Stability of the Inherent Target Metallome in Seed Crops and a Mushroom Grown on Soils of Extreme Mineral Spans

Gramss

Voigt

2016

Agronomy

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Extremes in soil mineral supply alter the metallome of seeds much less than that of their herbage. The underlying mechanisms of mineral homeostasis and the "puzzle of seed filling" are not yet understood. Field crops of wheat, rye, pea, and the mushroom Kuehneromyces mutabilis were established on a set of metalliferous uranium mine soils and alluvial sands. Mineral concentrations in mature plants were determined from roots to seeds (and to fungal basidiospores) by ICP-MS following microwave digestion. The results referred to the concentrations of soil minerals to illustrate regulatory breaks in their flow across the plant sections. Root mineral concentrations fell to a mean of 7.8% in the lower stem of wheat in proportions deviating from those in seeds. Following down-and up-regulations in the flow, the rachis/seed interface configured with cuts in the range of 1.6%-12% (AsPbUZn) and up-regulations in the range of 106%-728% (CuMgMnP) the final grain metallome. Those of pea seeds and basidiospores were controlled accordingly. Soil concentration spans of 9-109ˆin CuFeMnNiZn shrank thereby to 1.3-2ˆin seeds to reveal the plateau of the cultivar's desired target metallome. This was brought about by adaptations of the seed:soil transfer factors which increased proportionally in lower-concentrated soils. The plants thereby distinguished chemically similar elements (As/P; Cd/Zn) and incorporated even non-essential ones actively. It is presumed that high-and low-concentrated soils may impair the mineral concentrations of phloems as the donors of seed minerals. In an analytical and strategic top performance, essential and non-essential phloem constituents are identified and individually transferred to the propagules in precisely delimited quantities.

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“…Some plant species can withstand the excess of metals present in the environment whether through compartmentalization (Dal corso et al, 2013), chelation, exclusion or accumulation (Thounaojam et al, 2012). This capability is typically described in particular in species that grow or show a frequency and/or high abundance in copper-contaminated soils, allowing soil stabilization through uptake and retaining metals.…”

Section: Introductionmentioning

confidence: 99%

“…This capability is typically described in particular in species that grow or show a frequency and/or high abundance in copper-contaminated soils, allowing soil stabilization through uptake and retaining metals. It has been suggested that this specific compartmentalization of metals in the cell may be the reason for a plant's development of more complex tolerance mechanisms to certain metals (Dal corso et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Effect of copper (II) ions on morpho-physiological and biochemical variables in Colobanthus quitensis

Cuba‐Díaz

Marín

Castel

et al. 2017

J. Soil Sci. Plant Nutr.

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Colobanthus quitensis is a species with a wide geographical distribution, including Antarctica. This species must endure a series of limiting abiotic factors in its habitats, such as, high metal ion concentrations. It has been described to inhabit areas where only metal-tolerant species can live. Therefore, it is postulated that the study of this species may provide information about copper tolerance mechanisms. We evaluated the effect of copper (II) ions (control, 100 and 500 µM) on C. quitensis seedlings in vitro, determining morpho-physiological and biochemical variables. Copper showed a significantly negative effect on the development of new shoots (500 µM) and floral apex appearance (100 µM). The analyzed Cu concentrations significantly affected leaf and root length and induced a significant increase in guaiacol peroxidase (G-POD) enzyme activity. The highest proline accumulation took place in seedlings subjected to 500 µM. Furthermore, this concentration induced a significant reduction in chlorophyll a content and exhibited oxidative stress evaluated through an increase in malondialdehyde levels. This is the first study to demonstrate evidence of copper effects on morphological, physiological and biochemical variables in C. quitensis.

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An overview of heavy metal challenge in plants: from roots to shoots

Cited by 247 publications

References 172 publications

Heavy Metal Uptake and Transport in Plants

Heavy Metal Uptake and Transport in Plants

Stability of the Inherent Target Metallome in Seed Crops and a Mushroom Grown on Soils of Extreme Mineral Spans

Effect of copper (II) ions on morpho-physiological and biochemical variables in Colobanthus quitensis

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