Abstract
Several fungal species are notorious for the preferential acquisition of toxicants such as AsCdHgPbU in their wild-grown basidiomes, but it is not known how, or whether at all, mineral uptake is regulated. In this study, basidiomes of Kuehneromyces mutabilis, Pleurotus ostreatus, and Hypholoma fasciculare were grown on Fagus sylvatica logs embedded in sand, uranium-overburden soil, and garden soil (SIO) at a lab scale to raise the accessible mineral resources 30 to >1,000 times over those available in the timber alone. Non-embedded logs and a field culture established on SIO served as controls. Concentrations of 22 minerals were determined by inductively coupled plasma mass spectrometry from microwave-digested samples of timber, soils, whole and dissected mushrooms, and basidiospores. It was the goal to determine whether mineral uptake rates vary simply with their concentration in the substrate or undergo selections which indicate the ability of metal sensing and optimizing/delimiting the quantity of (essential) elements on their passage from a substrate via basidiome to the basidiospores. It is shown that an underrepresented substrate mineral is up-concentrated to a more or less regulated and physiologically compatible mean, whereas a rising external mineral supply leads to uptake blockage by downregulation of the bioconcentration rate in the vicinity of an apparent mycelial saturation point. The resulting concentrations in whole K. mutabilis basidiomes of the essential metals, CaCoCuFeMgMn(Sr)Zn corresponded surprisingly with those in wheat grains which share the main metabolic pathways with fungi and whose metallome is believed to be out-regulated for an optimum and stress-free development. Concentrations of nonessential metals, too, fitted the range of those common crops, whereas KP reached the higher typical level of fungi. Minerals entering the lower stipe of the K. mutabilis basidiome were specifically enriched/diluted on a passage to the gills and once more abruptly up/down-concentrated at the basidium/sterigma/spore interface. Mineral concentrations of spores corresponded then again with those in wheat grains, with the metalloenzyme-linked CdCoCuFeMnNa(Ni) appearing moderately higher. It is concluded that the substrate/fungal interface may be the major site of metal sensing/selecting and uptake regulation. Concentration shifts obtained during the mineral transfer through the basidiome are then subject to ultimate corrections at the gill/spore interface.
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Gramss, G., Voigt, KD. Clues for Regulatory Processes in Fungal Uptake and Transfer of Minerals to the Basidiospore. Biol Trace Elem Res 154, 140–149 (2013). https://doi.org/10.1007/s12011-013-9719-3
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DOI: https://doi.org/10.1007/s12011-013-9719-3