Results obtained for S. bovinus suggest a lower Cd translocation to
the shoots at 15 mg Cd kg−1 when compared with non inoculated
seedlings. However the increased shoot dry weight of S. bovinusinoculated
seedlings at that specific concentration, and in the same
proportion as the reduction in Cd concentration, suggests a misleading
dilution effect. At 15 mg Cd kg−1, R. roseolus increased total Cd
concentration in the plant (by significantly increasing metal concentration
in both parts of the plant) whereas at 30 mg Cd kg−1 this association
provided the lowest accumulation. Contradictory results
have been reported on metal uptake by fungi (Jentschke and
Godbold, 2000). Bücking and Heyser (1994) referred that metal
transportation from the ectomycorrhiza to the pine host is partly dependent
on the metal concentration of the soil, and Khan et al. (2000)
suggested that this effect possibly applies to other heavy metals and it
might explain some of the contradictory reports on metal uptake. In
this study, shoot Cd concentrations of R. roseolus-inoculated seedlings
indeed remained constant when Cd concentration in the soil increased.
Nevertheless, the different behavior of S. bovinus-inoculated
seedlings corroborates that metal uptake capacity is also utterly dependent
on fungal species or strains (Jentschke and Godbold, 2000).
 
Results obtained for S. bovinus suggest a lower Cd translocation to
the shoots at 15 mg Cd kg−1 when compared with non inoculated
seedlings. However the increased shoot dry weight of S. bovinusinoculated
seedlings at that specific concentration, and in the same
proportion as the reduction in Cd concentration, suggests a misleading
dilution effect. At 15 mg Cd kg−1, R. roseolus increased total Cd
concentration in the plant (by significantly increasing metal concentration
in both parts of the plant) whereas at 30 mg Cd kg−1 this association
provided the lowest accumulation. Contradictory results
have been reported on metal uptake by fungi (Jentschke and
Godbold, 2000). Bücking and Heyser (1994) referred that metal
transportation from the ectomycorrhiza to the pine host is partly dependent
on the metal concentration of the soil, and Khan et al. (2000)
suggested that this effect possibly applies to other heavy metals and it
might explain some of the contradictory reports on metal uptake. In
this study, shoot Cd concentrations of R. roseolus-inoculated seedlings
indeed remained constant when Cd concentration in the soil increased.
Nevertheless, the different behavior of S. bovinus-inoculated
seedlings corroborates that metal uptake capacity is also utterly dependent
on fungal species or strains (Jentschke and Godbold, 2000).
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