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Gewählte Publikation:

Langer, I; Santner, J; Krpata, D; Fitz, WJ; Wenzel, WW; Schweiger, PF.
(2012): Ectomycorrhizal impact on Zn accumulation of Populus tremula L. grown in metalliferous soil with increasing levels of Zn concentration
PLANT SOIL. 2012; 355(1-2): 283-297. FullText FullText_BOKU

Our study aimed at characterizing the Zn phytoextraction potential of a metal tolerant Populus tremula accession in symbiosis with a community of ectomycorrhizal fungi from metal-contaminated soil that is naturally forming mycorrhizae with the experimental plant. Effects of the fungal community on P. tremula development, metal translocation and accumulation properties were tested under variable Zn bioavailability. In a pot experiment, P. tremula seedlings were grown for 88 days in a substrate composed of metalliferous soil from an aspen stand and non-contaminated agricultural soil spiked with ZnSO4 to yield total Zn additions from 0 to 80 mg kg(-1) substrate. The substrate contained the inherent mycorrhizal community of P. tremula (Nat-Myc) or was gamma-irradiated to eliminate living microbial propagules (Irr-NM treatment). gamma-Irradiation efficiently inhibited the formation of functional ectomycorrhizae in the control treatments. It increased dissolved organic carbon (DOC) in the substrate and increased the extractability of Zn and Cd by 1M NH4NO3. We found three times larger biomass and more than four times increased root lengths in the Irr-NM compared to the Nat-Myc treatments which may be explained by the doubled DOC concentrations and related Fe mobilization due to formation of labile complexes in the irradiation treatment and the absence of microbial competitors for (nutrient) resources. Our results indicate an imbalance of the normally mutualistic symbiosis between mycorrhizal fungi and the host at early growth stage, possibly further exacerbated by the high fragility and low nutrient reserves of the P. tremula seedlings obtained from a contaminated site. Foliar Zn concentrations were generally larger in the Nat-Myc treatments and exceeded those reported for numerous Salix and Populus species. While the Zn concentrations increased with increasing Zn additions, Zn translocation to shoots was inhibited at high Zn levels in the Nat-Myc treatments, indicating a barrier function of the mycorrhizal community. The observed barrier properties in the mycorrhizal treatments suggest that mycorrhizal inoculation of P. tremula may be a promising strategy to enhance revegetation and phytostabilization of metal-polluted sites. However, early-stage growth of P. tremula may be limited by imbalances between the fungal and plant partner in such nutrient-deficient, toxic environments.
Autor*innen der BOKU Wien:
Santner Jakob
Wenzel Walter

Find related publications in this database (Keywords)
Zinc (Zn)
Cadmium (Cd)
Lead (Pb)
Dose response

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