Genetically modified plants in phytoremediation of heavy metal and metalloid soil and sediment pollution.
Phytoremediation to clean up metal- and metalloid-contaminated soil or sediments has gained increasing attention as environmental friendly and cost effective. Achievements of the last decade suggest that genetic engineering of plants can be instrumental in improving phytoremediation. Transgenic approaches successfully employed to promote phytoextraction of metals (mainly Cd, Pb, Cu) and metalloids (As, Se) from soil by their accumulation in the aboveground biomass involved mainly implementation of metal transporters, improved production of enzymes of sulphur metabolism and production of metal-detoxifying chelators - metallothioneins and phytochelatins. Plants producing bacterial mercuric reductase and organomercurial lyase can covert the toxic ion or organomercury to metallic Hg volatized from the leaf surface. Phytovolatization of selenium compounds was promoted in plants overexpressing genes encoding enzymes involved in production of gas methylselenide species. This paper provides a broad overview of the evidence supporting suitability and prospects of transgenic research in phytoremediation of heavy metals and metalloids.
Kotrba
Pavel
P
Department of Biochemistry and Microbiology, Institute of Chemical Technology, Prague, Technická 5, Prague, 166 28 Czech Republic; Department of Natural Products, Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, Flemingovo sq. 2, 166 28 Prague, Czech Republic. Electronic address: pavel.kotrba@vscht.cz.
Najmanova
Jitka
J
Department of Biochemistry and Microbiology, Institute of Chemical Technology, Prague, Technická 5, Prague, 166 28 Czech Republic.
Macek
Tomas
T
Department of Biochemistry and Microbiology, Institute of Chemical Technology, Prague, Technická 5, Prague, 166 28 Czech Republic; Department of Natural Products, Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, Flemingovo sq. 2, 166 28 Prague, Czech Republic.
Ruml
Tomas
T
Department of Biochemistry and Microbiology, Institute of Chemical Technology, Prague, Technická 5, Prague, 166 28 Czech Republic.
Mackova
Martina
M
Department of Biochemistry and Microbiology, Institute of Chemical Technology, Prague, Technická 5, Prague, 166 28 Czech Republic.
D001673:Biodegradation, Environmental; D018533:Biomass; D017343:Genes, Plant; D019015:Geologic Sediments; D019216:Metals, Heavy / Q000302:isolation & purification / Q000378:metabolism*; D030821:Plants, Genetically Modified / Q000235:genetics / Q000378:metabolism*; D012989:Soil Pollutants / Q000302:isolation & purification / Q000378:metabolism*
D019216:Metals, Heavy; D012989:Soil Pollutants