The effects of cadmium and the cadmium-zinc interaction on the axenic growth of ectomycorrhizal fungi |
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Authors: | Jan V Colpaert Jozef A Van Assche |
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Institution: | (1) Laboratory of Plant Ecology, Katholieke Universiteit Leuven, K. Mercierlaan 92, B-3001 Leuven, Belgium |
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Abstract: | Eleven strains of ectomycorrhizal fungi belonging to seven species have been cultured on a cadmium-contaminated growth medium
in order to determine their in vitro cadmium tolerance. Four strains were collected from a zinc and cadmium-polluted soil.
Radial growth rate was a sensitive parameter to detect Cd toxicity. A wide differential response to Cd was obtained between
the individual species. A clear relation between Cd tolerance and site origin of the isolates did not exist, although such
a relationship was found when strains are compared within one species. Cd-sensitive and Cd-tolerant strains of Suillus bovinus were studied in more detail. Two isolates were grown on media with combinations of two non-toxic zinc concentrations and
three cadmium levels. Adding a higher Zn concentration to the medium resulted in a reduction of the toxic effect of Cd. This
antagonistic effect also resulted in a lowered Cd concentration in the mycelium. |
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Keywords: | cadmium tolerance cadmium toxicity ectomycorrhizal fungi zinc |
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