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The Effect of Mycorrhizal Fungi on the Fate of PCBs in Two Vegetated Systems

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The objective of this study was to investigate the effects of mycorrhizal infection on vegetative uptake of polychlorinated biphenyls. Feltleaf willow ( Salix alaxensis ) and balsam poplar ( Populus balsamifera ) were grown in soil spiked with 6 mg/kg 3,3′,4,4′-tetrachlorobiphenyl-(UL- 14 C). The fungicide Daconil 2787 ® was employed to suppress indigenous mycorrhizal infection. After 100 days of greenhouse incubation in semienclosed phytoreactors, mycorrhizal infection was found to be approximately threefold higher in the untreated willows vs. the fungicide-amended willows. Radio-label uptake was found to correlate most highly with mycorrhizal infection in the willow roots (R = 0.83). Over the same time period, mycorrhizal infection in the poplars was not significantly affected by fungicide addition. In the poplar phytoreactors, radiolabel uptake was most highly correlated with water use (R = 0.70). The overall vegetative radiolabel uptake was low (≈ 1%), but the limited uptake was attributed to soil sorption processes rather than vegetative limitations.
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Keywords: 3,3′,4,4′-tetrachlorobiphenyl; ectomycorrhizae; phytoremediation; polychlorinated biphenyls

Document Type: Research Article

Affiliations: Department of Civil and Environmental Engineering, 248 Duckering, University of Alaska Fairbanks, Fairbanks, AK, 99775-5900

Publication date: April 1, 2001

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