Heavy Metal Tolerance in Arabidopsis thaliana

Chaffai, Radhouane; Koyama, Hiroyuki

doi:10.1016/b978-0-12-385851-1.00001-9

Cited by 60 publications

(24 citation statements)

References 229 publications

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“…Most work assessing heavy metal toxicity in invertebrates has focused on non-essential, highly toxic metals such as cadmium and lead (Spehar et al, 1978;Posthuma & Van Straalen, 1993;Janssens et al, 2009). Yet, essential heavy metals, such as zinc, which serve as important micronutrients at low doses can also be toxic at higher levels (Chaffai & Koyama, 2011). Due to their essential nature, these metals may often be overlooked as important toxins to pollinators, even though they are common anthropogenic pollutants.…”

Section: Introductionmentioning

confidence: 99%

Assessing zinc tolerance in two butterfly species: consequences for conservation in polluted environments

Shephard¹,

Mitchell

Henry

et al. 2020

Insect Conserv Diversity

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Zinc is a widespread pollutant released from industrial combustion, automobile residue, and mining. Zinc accumulates in soils and mobilises into plant tissue where it may be consumed to potentially toxic levels by leaf feeding insects, including developing pollinators. While zinc tolerance thresholds have been previously assessed in insect pollinators, most observations are limited to model organisms and pest species. We lack understanding of zinc tolerance in insects of conservation concern. We assess dietary zinc tolerance of developing caterpillars from wild populations of the monarch butterfly (Danaus plexippus), a species of conservation concern, whose caterpillars are commonly exposed to elevated dietary zinc exposure in milkweed plants along roadsides. We contrast monarch zinc tolerance with that of cabbage white butterfly caterpillars (Pieris rapae), a non‐native pest species. Tolerance was assessed by rearing caterpillars on artificial diets containing varying levels of zinc. Zinc reduced monarch survival at levels as low as 344 mg kg−1 but positively impacted cabbage white survival at 227 and 738 mg kg−1. Cabbage whites also displayed prolonged development time, smaller adult body size, and slower growth rate, consistent with the possibility that zinc tolerance had fitness costs. Our results support previous observations that heavy metal tolerance varies between species and highlight the importance of broadening our understanding of tolerance to insect species of conservation concern before drawing general conclusions about insect susceptibility to heavy metal pollution. Nonetheless, our results suggest that zinc pollution alone is unlikely a risk in developing roadside habitat for monarch butterflies.

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Section: Introductionmentioning

confidence: 99%

Assessing zinc tolerance in two butterfly species: consequences for conservation in polluted environments

Shephard¹,

Mitchell

Henry

et al. 2020

Insect Conserv Diversity

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“…High Cd concentration leads to the formation of reactive oxygen species (ROS), causing oxidative stress that leads to damage of membranes indicated by an increase in thiobarbituric acid reactive substance (TBARS) as evidenced by enhanced lipid peroxidation, hydrogen peroxide generation, and ion leakage (Rodríguez-Serrano et al, 2006;Anjum et al, 2008). As a result, plants have evolved various mechanisms to tolerate excessive metal concentrations, such as binding Cd ions in cell walls, effluxing the metal ions from symplasm, reducing metal uptake by root immobilization or mycorrhizal action, exuding organic ligands that can inactivate toxic metal ions, sequestrating by specifically produced organic compounds, forming metal-peptide ligand complexes and compartments in vacuoles, and forming metal-resistant enzymes or metabolites to minimize metal-induced severe metabolic injuries (Lux et al, 2011;Chaffai and Koyama, 2011). The roles of antioxidant enzymes such as superoxide dismutase (SOD), peroxidase (POD), and catalase (CAT) have been shown to be important in plant Cd tolerance (Romero-Puertas et al, 2007;Chaffai and Koyama, 2011).…”

Section: Introductionmentioning

confidence: 99%

Responses to cadmium stress in two tomato genotypes differing inheavy metal accumulation

Zhao¹,

Zhang²,

Ye³

et al. 2015

Turk J Bot

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Our previous research defined two tomato (Solanum lycopersicum) genotypes: high cadmium (Cd) accumulator YSL189 and low Cd accumulator HZ903. Further hydroponics experiments investigated the different tolerance mechanisms to Cd stress between YSL189 and HZ903 at the seedling stage. When Cd concentration was >20 µM in the growing medium, the uptake rate of Cd was significantly higher in roots of YSL189 than it was in roots of HZ903. When plants were supplied with 50 and 100 µM Cd in the growing medium, there were higher Cd concentration, higher biomass and plant height, shorter roots, and higher expression levels of transporter genes natural resistance associated macrophage proteins (Nramp)2, Nramp3, and zinc and iron regulated transporter (ZIP) in roots of YSL 189 compared to HZ903. We infer that the high Cd accumulation in YSL189 was partly due to the higher Cd uptake rate and higher expression levels of Nramp2, Nramp3, and ZIP in its roots. At the same time, the degree of cell injury indicated by thiobarbituric acid reactive substance showed no significant differences in roots and stems between the two genotypes. We attribute this to the higher activities of superoxide dismutase, peroxidase, and catalase in roots and stems of YSL189 compared to HZ903.

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“…Cd ion uptake occurs via transmembrane carriers engaged in the uptake of Ca, Fe, magnesium (Mg), Cu, and Zn [27][28]. At the root level, IRT1, ZIP1, and NRAMP1 are the best-studied non-specific transporters responsible for Cd uptake and other divalent metal nutrient transporters [29][30][31][32].…”

Section: Discussionmentioning

confidence: 99%

“…Some investigations have proven that transporters (including the ZIP family transporters) participate in Cd absorption and accumulation in plants, and the balance between transport processes [31][32][33]. IRT1, the earliest discovered member of the ZIP family, is not only the primary root iron uptake system in plants but can also transport significant amounts of Cd [34][35].…”

Section: Discussionmentioning

confidence: 99%

Uptake and Accumulation of Cadmium and Relative Gene Expression in Roots of Cd-resistant Salix matsudana Koidz

Wang

et al. 2016

Pol. J. Environ. Stud.

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Heavy Metal Tolerance in Arabidopsis thaliana

Cited by 60 publications

References 229 publications

Assessing zinc tolerance in two butterfly species: consequences for conservation in polluted environments

Assessing zinc tolerance in two butterfly species: consequences for conservation in polluted environments

Responses to cadmium stress in two tomato genotypes differing inheavy metal accumulation

Uptake and Accumulation of Cadmium and Relative Gene Expression in Roots of Cd-resistant Salix matsudana Koidz

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