This phenomenon can be used in biofortification strategies in mushroom cultivation and result in their increased nutritional value or biological activity. Mushrooms are well known for their abilities to accumulate various metals and metalloids in their fruiting bodies, including those significant for human nutrition as well as toxic elements. The fruiting bodies of approximately 200 wild-growing and cultivated mushroom species are consumed in many countries as a delicacy but also due to increased interest in their biological qualities and potential use as functional foods or a source of novel pharmaceuticals. The obtained results show the significant role of Ge–Se interaction in the accumulation of these elements in the studied mushroom species. The addition of Ge and Se + Ge resulted in losses of ergosterol content in comparison to cultivation with Se supplementation and control. Ergosterol content in the fruiting bodies of both species displayed the highest values in all the experimental systems supplemented with Se. However, the bioaccessibility of this element was low, in the range 5.4–6.6% ( P. lucidum reached up to 70 and 80 mg kg −1, respectively. Increasing levels of Ge in the substrates elevated the content of organic selenium in the fruiting bodies of G. Even though inorganic Se was used to enrich the experimental substrates, organic Se compounds dominated in the fruiting bodies. lucidum was observed only at the two highest levels of supplementation with both elements. A synergistic effect of Ge supplementation on Se accumulation in fruiting bodies of G. Se supplementation caused no observable changes to morphology while the addition of Ge induced changes in size and/or colour, especially for P. Both species were grown in four independent experimental systems with different concentrations of germanium powder (1, 5 and 10 mM), selenite and selenate (0.1, 0.4 and 0.8 mM of each Se species). The aim of this study was to examine the effects of substrate supplementation with germanium (Ge) and selenium (Se), alone or combined, on the growth, element accumulation and ergosterol content in the fruiting bodies of the mushroom species Ganoderma lucidum and Pleurotus ostreatus.
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