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90SR UPTAKE BY PINUS PONDEROSA AND PINUS RADIATA SEEDLINGS INOCULATED WITH ECOTOMYCORRHIZAL FUNGI
Citation:
Entry, J., P. Rygiewicz, AND W. Emmingham. 90SR UPTAKE BY PINUS PONDEROSA AND PINUS RADIATA SEEDLINGS INOCULATED WITH ECOTOMYCORRHIZAL FUNGI. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/J-94/467 (NTIS PB95137295).
Description:
Strontium-90 (90Sr) is a radionuclide characteristic of fallout from nuclear reactor accidents and nuclear weapons testing. rior studies have shown that Pinus ponderosa and P. radiata seedlings can remove appreciable quantities of 90Sr from soil and store it in plant tissue. n this study, we inoculated P. ponderosaand P. radiata seedlings with one of five isolates of ectomycorrhizal fungi; inoculated and noninoculated (control) seedlings were compared for their ability to remove 90Sr from an organic growth medium. eedlings were grown for 3 months in a growth chamber in glass tubes containing 165 cm3 of sphagnum peat moss and perlite and, except in the controls, the fungal inoculum. fter 3 months, 5978 Bq of 9OSr in 1 ml of sterile, distilled, deionized water was added. eedlings were grown for an additional month and then harvested. . ponderosa seedlings that were inoculated with ectomycorrhizal fungi accumulated 3.0-6.O% of the 9OSr; bioconcentration ratios ranged from 98-162. noculated P. radiata seedlings accumulated 6.0-6.9% of the 90Sr; bioconcentration ratios ranged from 88-133. oninoculated P. ponderosa and P. radiata seedlings accumulated only 0.6 and 0.7% of the 9OSr and had bioconcentration ratios of 28 and 27, respectively. . ponderosa and P. radiata seedlings that have been inoculated with ectomycorrhizal fungi may be able to remove 3 to 5 times more 90Sr from contaminated soil than noninoculated seedlings.
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90SR UPTAKE BY PINUS PONDEROSA AND PINUS RADIATA SEEDLINGS INOCULATED WITH ECOTOMYCORRHIZAL FUNGI