Compartmentation of metals in foliage of Populus tremula grown on soils with mixed contamination. I. From the tree crown to leaf cell level.
In order to achieve efficient phytoextraction of heavy metals using trees, the metal allocation to aboveground tissues needs to be characterised. In his study, the distribution of heavy metals, macro- and micronutrients and the metal micro-localisation as a function of the leaf position and heavy metal treatment were analysed in poplars grown on soil with mixed metal contamination. Zinc was the most abundant contaminant in both soil and foliage and, together with cadmium, was preferentially accumulated in older foliage whereas excess copper and lead were not translocated. Changes in other element concentrations indicated an acceleration in aging as a consequence of the metal treatment. Excess zinc was irregularly accumulated inside leaf tissues, tended to saturate the veins and was more frequently stored in cell symplast than apoplast. Storage compartments including metabolically safe and sensitive subcellular sites resulted in sizable metal accumulation as well as stress reactions.
Vollenweider
Pierre
P
Swiss Federal Institute for Forest, Snow and Landscape Research (WSL), Zürcherstrasse 111, 8903 Birmensdorf, Switzerland. Electronic address: pierre.vollenweider@wsl.ch.
Menard
Terry
T
Swiss Federal Institute for Forest, Snow and Landscape Research (WSL), Zürcherstrasse 111, 8903 Birmensdorf, Switzerland.
Günthardt-Goerg
Madeleine S
MS
Swiss Federal Institute for Forest, Snow and Landscape Research (WSL), Zürcherstrasse 111, 8903 Birmensdorf, Switzerland.
D003300:Copper / Q000378:metabolism; D007854:Lead / Q000378:metabolism; D008670:Metals / Q000378:metabolism*; D018515:Plant Leaves / Q000378:metabolism*; D032107:Populus / Q000378:metabolism*; D012989:Soil Pollutants / Q000378:metabolism*; D015032:Zinc / Q000378:metabolism
D008670:Metals; D012989:Soil Pollutants; D007854:Lead; D003300:Copper; D015032:Zinc