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Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/11135

Title: Zn pollution counteracts Cd toxicity in metal-tolerant ectomycorrhizal fungi and their host plant, Pinus sylvestris
Authors: KRZNARIC, Erik
Cloquet, Christophe
Vanhaecke, Frank
Issue Date: 2010
Citation: ENVIRONMENTAL MICROBIOLOGY, 12(8). p. 2133-2141
Abstract: P>Adaptive Zn and Cd tolerance have evolved in populations of the ectomycorrhizal fungus Suillus luteus. When exposed to high concentrations of both metals in vitro, a one-sided antagonism was apparent in the Zn- and Cd-tolerant isolates. Addition of high Zn concentrations restored growth of Cd-stressed isolates, but not vice versa. The antagonistic effect was not detected in a S. luteus isolate from non-contaminated land and in Paxillus involutus. The fungi were inoculated on pine seedlings and subsequently exposed to ecologically relevant Zn and Cd concentrations in single and mixed treatments. The applied doses severely reduced nutrient acquisition of non-mycorrhizal pines and pines inoculated with metal-sensitive S. luteus. Highest translocation of Zn and Cd to shoots occurred in the same plants. Seedlings inoculated with fungi collected from the polluted site reduced metal transfer to their host and maintained nutrient acquisition under high metal exposure. The isolate showing highest tolerance in vitro also offered best protection in symbiosis. The antagonistic effect of high Zn on Cd toxicity was confirmed in the plant experiment. The results indicate that a Zn- and Cd-polluted soil has selected ectomycorrhizal fungi that are able to survive and protect their phytobiont from nutrient starvation and excessive metal uptake.
Notes: [Krznaric, Erik; Wevers, Jan H. L.; Vangronsveld, Jaco; Colpaert, Jan V.] Hasselt Univ, Ctr Environm Sci, Environm Biol Grp, B-3590 Diepenbeek, Belgium. [Cloquet, Christophe; Vanhaecke, Frank] Univ Ghent, Dept Analyt Chem, B-9000 Ghent, Belgium. jan.colpaert@uhasselt.be
URI: http://hdl.handle.net/1942/11135
DOI: 10.1111/j.1462-2920.2009.02082.x
ISI #: 000280652500008
ISSN: 1462-2912
Category: A1
Type: Journal Contribution
Validation: ecoom, 2011
Appears in Collections: Research publications

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