engleski

Influence of soil geochemistry on the chemical composition of the summer truffle (Tuber aestivum)

Mycorrhizal fungi, such as truffles, absorb elements from a substrate through their mycelium and provide the symbiotic plant with minerals and water, while accumulating metals to prevent their passage into the plant. Due to the popularity of summer truffles in human diet, determination of their elemental composition is important to determine the possible negative effects on human health. The concentration of elements in fruiting bodies is largely dependent on fungal species and soil properties, and while the former are being studied, there are few data on the latter. With the aim of investigating this influence, as well as the distribution of elements in the mycorrhizal system, the concentrations of 12 elements (Al, Ca, Cu, Fe, K, Li, Mg, Mn, Na, P, S and Zn) were determined in soil, truffle and bark samples from symbiotic plants at 13 sites in Croatia using HR - ICP mass spectrometry. The results distinguished elements whose uptake is under the dominant influence of truffle species and symbiotic plant species (Cu, K, Mg, P, S and Zn) and those whose uptake is under the dominant influence of soil properties (Al, Ca, Fe, Li, Mn and Na). In some truffle samples, the concentrations of Al, Fe and Mn were higher than the recommended tolerable daily intake of these elements. Since changes in atmospheric deposition of elements are rapidly registered in the surface layer of the soil, fungi are particularly susceptible to elevated concentrations of harmful elements due to their affinity for certain metals, which then readily enter humans through the food chain.

multi-element analysis , bioaccumulation ; wild edible fungi

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