Record ID No. |
168 |
Author(s) |
Colpaert J. V., Muller L A. H., Lambaerts M., Adriaensen K., Vangronsveld J. , 2004 |
Affiliation |
Limburgs University Centre, Environmental Biological Group, University Campus, B-3590 Diepenbeek, Belgium |
Title |
Evolutionary adaptation to Zn toxicity in populations of Suilloid fungi |
Source. Vol.(no):Page |
New Phytologist. 162(2): 549-559 p. |
Categories |
Ectomycorrhiza |
Subjects |
Soil plant relations |
Sub-subjects |
Heavy Metals |
Host |
n.a. |
Organism |
Suillus luteus, Suillus bovinus, Rhizopogon luteolus, Paxillus involutus |
Country |
Belgium, Europe |
Abstracts |
Zn tolerance was investigated in populations of four
ectomycorrhizal fungi: Suillus luteus, Suillus bovinus,
Rhizopogon luteolus and Paxillus involutus. The fungi were
collected in pioneer pine forests at 14 different locations,
situated along a Zn pollution gradient. Genetic adaptation to Zn
toxicity was previously presumed in a population of S.
luteus.Mycelial biomass production was assessed for 235 isolates
exposed to increasing Zn2+ stress. EC50 concentrations were
determined.Adaptive Zn tolerance was found in the three species
from the Suilloid clade and not in P. involutus. The Suilloid
fungi collected within 5 km from a Zn smelter were highly
Zn-tolerant, in contrast to isolates collected at least 15 km
away from a pollution source. Mixed populations with tolerant
and sensitive S. luteus isolates were found in a transition
zone, between 5 and 15 km from the Zn smelters.The severe Zn
pollution in the surroundings of the Zn smelters has clearly
triggered the evolution of an increased Zn tolerance in the
pioneer Suilloid fungi. With increasing distances from the Zn
smelters, the frequency of Zn-tolerant genotypes decreases.
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