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- W2110852092 abstract "Abstract: Heavy metals provoke environmental pollution with potentially toxic effects on human and plants systems. Recently, investigations are conducted on plants that may play a relevant role on pollutants absorption or stabilization, focusing on fast growing tree species in agronomic conditions; little is known on the effects of contaminants on tree species colonizing abandoned fields to be used in restoration ecology. The effects of Cd on photosynthetic performance and metal accumulation were investigated in Quercus pubescens Willd. seedlings grown in pots containing a mixture of sand, clay, turf and Cd-treatments (0, 25 and 75 mg kg-1 dry soil). The studied photosynthetic parameters (Asat= net phytosynthesis; Rday= day respiration; Γcomp= CO2 compensation point; Vcmax= maximum carboxylation rate; Jmax = electron transport rate; TPU = triose phosphate use; Ci/Ca = ratio of intercellular (Ci) to ambient (Ca) [CO2] (Ci/Ca); Jmax/Vcmax = ratio; (gsmax) = maximum stomatal conductance; (lg) = stomatal conductance estimated relative to the photosynthetic rate; (Fv/Fm) = maximum quantum yield of PSII photochemistry; (ΔF/F’m) = effective photochemical efficiency) varied progressively with increasing Cd concentration in the soil, highlighting a negative impact on photosynthetic potential and PSII functioning. Approximately 10% of added Cd was found to be extractable from the substrate, at the maximum concentration applied, with about 12 and 0.75 as bioaccumulation and translocation factors, respectively. Analogously, Cd accumulated up to 34, 30 and 46 mg kg-1 in leaves, stem and roots, respectively. While it is not possible to extrapolate from the present study with seedlings to effects on mature pine trees, there are clear implications for regeneration in soils contaminated with heavy metals, which may lead to ecosystem deterioration." @default.
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- W2110852092 date "2012-10-04" @default.
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- W2110852092 title "Ecophysiological characteristics and cadmium accumulation in Downy Oak (Quercus pubescens Willd.)" @default.
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- W2110852092 doi "https://doi.org/10.3832/efor0700-009" @default.
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