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Titolo:
BIOCHEMISTRY AND MOLECULAR-BIOLOGY OF HEA VY-METAL ACCUMULATION IN HIGHER-PLANTS
Autore:
MAYWALD F; WEIGEL HJ;
Indirizzi:
FAL,INST PROD & OKOTOXIKOL BRAUNSCHWEIG GERMANY
Titolo Testata:
Landbauforschung Volkenrode
fascicolo: 3, volume: 47, anno: 1997,
pagine: 103 - 126
SICI:
0458-6859(1997)47:3<103:BAMOHV>2.0.ZU;2-F
Fonte:
ISI
Lingua:
GER
Soggetto:
PISUM-SATIVUM L; METALLOTHIONEIN-LIKE GENE; AGROSTIS-TENUIS SIBTH; GLYCINE-RICH PROTEIN; MAIZE INBRED LINES; TOMATO MUTANT CHLORONERVA; CADMIUM-BINDING PEPTIDES; PHOSPHATE-UPTAKE SYSTEM; HOLCUS-LANATUS L; GERM-EC-PROTEIN;
Tipo documento:
Review
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
231
Recensione:
Indirizzi per estratti:
Citazione:
F. Maywald e H.J. Weigel, "BIOCHEMISTRY AND MOLECULAR-BIOLOGY OF HEA VY-METAL ACCUMULATION IN HIGHER-PLANTS", Landbauforschung Volkenrode, 47(3), 1997, pp. 103-126

Abstract

Heavy metals, such as Cd, Cu, Zn, Bi, Ni, Hg and Pb are ubiquitous components of the biosphere. They are either essential trace nutrients, but may be toxic, when present at concentrations higher than required for optimal growth conditions. Contamination of soils with toxic metalions may have adverse effects on plants and soil biota and may imposea risk for humans along the food chain. Populations of a variety of higher plant species are able to colonize these environments. One of the best-known examples are metal-hyperaccumulating plants, which have evolved on these sites through natural selection. Hyperaccumulation is an ecophysiological adaptation to metalliferous soils. These plants often accumulate only a specific metal, they grow slowly and have a small biomass. Little is known about their agronomic characteristics, breeding potential and physiology. Interest in these metal-hyperaccumulating mechanisms has come from the developments in phytoremediation, a new technology, using high biomass metal-accumulating plants to extract toxic metals from contaminated soils. The mechanisms of metal accumulation, which involve extracellular and intracellular metal chelation, precipitation, compartmentalization and translocation in the vascular system are poorly understood. Well-known metal-binding proteins includemetallothioneins, metalloenzymes and various metal storage, carrier and channel/transport proteins. In addition phytochelatins, low molecular weight gamma-Glu-Cys-peptides with high affinity for certain metalsare assumed to be involved in accumulation, detoxification and metabolism of metal ions such as Cd, Zn, Cu, Pb and Hg in plant cells. At present, the wheat E-c-protein is the only plant protein, that can be unequivocally designated as a metallothionein. Many metallothionein-likeplant genes have been isolated from different species and the available data indicate, that these genes have a role in metal metabolism. Most of their translational products remain to be purified from plant material and sequenced. Metal-induced gene expression and regulation is a broad field for further investigations. Increased metal tolerance has already been obtained by the introduction of different metallothioneins into higher plants. Only by analysing the mechanisms of metal uptake and metal storage at the molecular level, it will be possible in future, to develop crop plants with hyperaccumulating tendencies and to establish phytoremediation as a modem technology of environmental cleanup.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 28/09/20 alle ore 17:27:58