Mercury Levels in Blusher Mushrooms and Soil Based on Location and Growth Stages

Greg Howard
29th June, 2024

Mercury Levels in Blusher Mushrooms and Soil Based on Location and Growth Stages

Mercury accumulation in the caps and stipes of the Blusher mushroom (Amanita rubescens) generally increases through its seven developmental stages (I–VII), supporting the study's conclusion that younger mushrooms are safer for consumption.

Image adapted from: Demková et al. / CC BY (Source)

Key Findings

  • The study, conducted in Slovakia, found high mercury levels in soils, especially in former mining areas
  • Amanita rubescens mushrooms from these areas also showed high mercury content, posing health risks
  • The mercury accumulation in mushrooms varied with their developmental stages, with higher levels in older mushrooms
Mercury contamination in the environment is a pressing issue, particularly due to its bioaccumulative nature and potential health risks. In a recent study conducted by the University of Prešov, researchers assessed the health risk associated with consuming the edible mushroom Amanita rubescens Pers., commonly collected in Slovakia, due to its mercury content[1]. This study is significant as it provides insights into mercury accumulation in mushrooms, a topic previously explored in different contexts[2]. The study involved analyzing 364 samples from 40 different localities in Slovakia. Researchers used an AMA-254 analyzer to determine the total mercury content in both soil and mushroom samples. They also evaluated the contamination factor (Cf) and the index of geoaccumulation (Igeo) to assess the level of soil pollution by mercury. The ability of A. rubescens to accumulate mercury from the soil was measured using the bioconcentration factor (BCF), while the distribution of mercury within the mushroom was assessed using the translocation quotient (Qc/s). One of the alarming findings was the high levels of mercury in soils, particularly in former mining areas. This is consistent with earlier studies that have shown mushrooms' ability to accumulate heavy metals from their substrates[3]. In this study, the contamination was found to be serious enough to pose health risks, not only in former mining areas but also in other parts of Slovakia. The study also examined 21 samples from seven developmental stages of the fruiting body of A. rubescens in the Žakýlske pleso locality. It was found that the highest bioconcentration factor was at developmental stage VI for caps, with a value of 2.47 mg kg−1, and at developmental stage VII for stipes, with a value of 1.65 mg kg−1 DW. This indicates that the mushroom's ability to accumulate mercury varies with its developmental stage. To determine the health risks associated with consuming these mushrooms, the researchers used the percentages of provisional tolerable weekly intake (%PTWI) and the target hazard quotient (THQ). The results confirmed that consuming A. rubescens could be risky due to the high mercury content, especially in areas with significant soil contamination. This study expands on previous research that has shown mushrooms' capacity to accumulate various elements, including metals, from their environment[2][3]. For instance, earlier studies have demonstrated that mushrooms like Boletus edulis can accumulate elements such as selenium and exclude harmful ones like arsenic and lead[3]. Similarly, the European Blusher has been found to effectively accumulate mercury, with significant levels detected in its fruiting bodies across various sites in Poland[2]. The findings from the University of Prešov study are crucial as they highlight the potential health risks associated with consuming wild mushrooms from contaminated areas. This research underscores the need for monitoring and regulating the collection of wild edible mushrooms to ensure public safety. It also opens up avenues for further studies on the bioremediation potential of fungi, given their ability to accumulate and possibly detoxify heavy metals from their environment[4]. In conclusion, the study conducted by the University of Prešov provides valuable insights into the mercury contamination in Amanita rubescens and its implications for human health. By building on previous research, it emphasizes the importance of understanding the environmental and health impacts of consuming wild mushrooms, particularly in areas with a history of industrial activity.

EnvironmentHealthMycology

References

Main Study

1) Blusher mushroom (Amanita rubescens Pers.): A Study of Mercury Content in Substrate and Mushroom Samples from Slovakia with Respect to Locality and Developmental Stages

Published 28th June, 2024

https://doi.org/10.1007/s12011-024-04280-8

Related Studies

2) Mercury in European Blushers, Amanita rubescens, mushrooms and topsoils: bioconcentration potential and intake assessment.

https://doi.org/10.1080/03601234.2012.663609

3) Elemental bioaccumulation and nutritional value of five species of wild growing mushrooms from South Africa.

https://doi.org/10.1016/j.foodchem.2020.126596

4) Untapped potential: exploiting fungi in bioremediation of hazardous chemicals.

https://doi.org/10.1038/nrmicro2519


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