The Genetic Basis of Metal Hyperaccumulation in Plants

Pollard, A. Joseph; Powell, Keri Dandridge; Harper, Frances A.; Smith, J. Andrew C.

doi:10.1080/0735-260291044359

Cited by 381 publications

(239 citation statements)

References 132 publications

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“…2-times the minimum limit defined for Cd hyperaccumulation (100 lg g 21 shoot DW; Baker and Walker, 1990). Preferential accumulation of metal in the shoot is also an important condition for hyperaccumulation ability (Pollard et al, 2002). Chamomile cannot therefore be considered as a Cd hyperaccumulator but rather as a metal excluder since roots contained 7-and 10-times higher Cd amounts at 60 and 120 lM treatments, respectively.…”

Section: Discussionmentioning

confidence: 99%

Physiological responses of Matricaria chamomilla to cadmium and copper excess

Kováčik

Bačkor

Kaduková

2008

Environmental Toxicology

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Physiological responses of Matricaria chamomilla plants exposed to cadmium (Cd) and copper (Cu) excess (3, 60, and 120 lM for 7 days) with special emphasis on phenolic metabolism were studied. Cu at 120 lM reduced chamomile growth, especially in the roots where it was more abundant than Cd. Notwithstanding the low leaf Cu amount (37.5 lg g 21 DW) in comparison with Cd (237.8 lg g 21 DW) at 120 lM, it caused reduction of biomass accumulation, F v /F m ratio and soluble proteins. In combination with high accumulation of phenolics, strong reduction of proteins and high GPX activity in the roots, this supports severe redox Cu properties. In terms of leaf phenylalanine ammonia-lyase (PAL) activity, it seems that Cd had a stimulatory effect during the course of the experiment, whereas Cu was found to stimulate it after 7-day exposure. The opposite trend was visible in the roots, where Cd had a stimulatory effect at high doses but Cu mainly at the highest dose. This supports the assumption of different PAL time dynamics under Cd and Cu excess. A dose of 60 and 120 lM Cu led to 2-and 3-times higher root lignin accumulation while the same Cd doses increased it by 33 and 68%, respectively. A Cu dose of 120 lM can be considered as limiting for chamomile growth under conditions of present research, while resistance to high Cd doses was confirmed. However, PAL and phenolics seemed to play an important role in detoxification of Cd-and Cu-induced oxidative stress. # 2008 Wiley Periodicals, Inc. Environ Toxicol 23: 123-130, 2008

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Section: Discussionmentioning

confidence: 99%

Physiological responses of Matricaria chamomilla to cadmium and copper excess

Kováčik

Bačkor

Kaduková

2008

Environmental Toxicology

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“…This trait is present in only ∼ 500 species, representing o0.2% of all angiosperm species Verbruggen et al, 2009;Krämer, 2010;Van der Ent et al, 2013). In contrast to metal excluders whose strategy is to control the uptake of metals into the root and prevent metal translocation to aerial organs, hyperaccumulators accumulate metals in the shoot to levels toxic to most other plants (Baker, 1981;Baker and Brooks, 1989;Baker et al, 2000;Pollard et al, 2002;Krämer, 2010;Rascio and Navari-Izzo, 2011). This is remarkable as the photosynthetic apparatus is one of the major targets of metal phytotoxicity, typically resulting in severe symptoms such as chlorosis and necrosis, wilting, abnormal development and reduced growth (Pandey and Sharma, 2002;Rahman et al, 2005;Marschner and Marschner, 2012).…”

Section: Metal Hyperaccumulation In Plantsmentioning

confidence: 99%

Evolution of nickel hyperaccumulation and serpentine adaptation in the Alyssum serpyllifolium species complex

et al. 2016

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Metal hyperaccumulation is an uncommon but highly distinctive adaptation found in certain plants that can grow on metalliferous soils. Here we review what is known about evolution of metal hyperaccumulation in plants and describe a population-genetic analysis of the Alyssum serpyllifolium (Brassicaceae) species complex that includes populations of nickelhyperaccumulating as well as non-accumulating plants growing on serpentine (S) and non-serpentine (NS) soils, respectively. To test whether the S and NS populations belong to the same or separate closely related species, we analysed genetic variation within and between four S and four NS populations from across the Iberian peninsula. Based on microsatellites, genetic variation was similar in S and NS populations (average H o = 0.48). The populations were significantly differentiated from each other (overall F ST = 0.23), and the degree of differentiation between S and NS populations was similar to that within these two groups. However, high S versus NS differentiation was observed in DNA polymorphism of two genes putatively involved in adaptation to serpentine environments, IREG1 and NRAMP4, whereas no such differentiation was found in a gene (ASIL1) not expected to play a specific role in ecological adaptation in A. serpyllifolium. These results indicate that S and NS populations belong to the same species and that nickel hyperaccumulation in A. serpyllifolium appears to represent a case of adaptation to growth on serpentine soils. Further functional and evolutionary genetic work in this system has the potential to significantly advance our understanding of the evolution of metal hyperaccumulation in plants.

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“…& C. Presl with a high ability to accumulate Cd and Zn [26], the fast growing tree Salix smithiana Smith with a high metal accumulation ability [27] and the grass Lolium perenne L. representing common pasture plants were cultivated in pot experiments in two soils from The Czech Republic (Fluvisol -location Píšťany and Cambisol -location Příbram) differing in total content of risk elements (Table 1), physical properties characterized with soil composition [28] (Table 2), and physical-chemical characteristics ( Table 3). Plants were cultivated in 6 litres plastic pots with 5 kg of air-dried soil with four replicates for each treatment.…”

Section: Pot Experimentsmentioning

confidence: 99%

The use of differential pulse anodic stripping voltammetry and diffusive gradient in thin films for heavy metals speciation in soil solution

et al. 2008

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Abstract:In the soil solutions obtained in situ with suction cups from soils (Cambisol and Fluvisol) of pot experiment with Salix smithiana Smith, Lolium perenne L. and Thlaspi caerulescens J. & C. Presl heavy metals species (Cd, Pb and Cu) were assayed by differential pulse anodic stripping voltammetry and diffusive gradient in thin films. Prediction of accumulation performed best at free metal ion concentrations in unchanged pH (in 10 -3 mol L -1 NaClO 4 base electrolyte). The speciation provided by differential pulse anodic stripping voltammetry according to pH can provide a detailed description of the soil solution matrix. The concentration of free metals in unchanged pH represents a small part of the total content and varied from 0.04 to 0.75% with two exceptions found for accumulating plants (the content of Cd 2+ in the soil solution from T. caerulescens was about 6% and the content of Cu 2+ in the soil solution from S. smithiana was about 30%). The available concentration as determined by diffusive gradient in thin films was not in correlation with the heavy metals concentration in plant biomass. Warsaw and Springer-Verlag Berlin Heidelberg. © Versita

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The Genetic Basis of Metal Hyperaccumulation in Plants

Cited by 381 publications

References 132 publications

Physiological responses of Matricaria chamomilla to cadmium and copper excess

Physiological responses of Matricaria chamomilla to cadmium and copper excess

Evolution of nickel hyperaccumulation and serpentine adaptation in the Alyssum serpyllifolium species complex

The use of differential pulse anodic stripping voltammetry and diffusive gradient in thin films for heavy metals speciation in soil solution

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