Radiocesium in Shiitake mushroom: Accumulation in living fruit bodies and leaching from dead fruit bodies.

Fabiola Guido-Garcia, Fuminori Sakamoto, Karine David, Naofumi Kozai, Bernd Grambow

Chemosphere 2021 Sep

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In this paper, cesium (Cs) accumulation by the saprophytic fungus Lentinula edodes (Shiitake) was investigated to contribute to the elucidation of radiocesium-cycling mechanisms in forest environments. Although the 137Cs in the mushroom bed before culture was bioavailable, the transfer factor (TF) of Cs (133Cs and 137Cs) from the mushroom bed to fruit bodies was low (approximately 1) and the TFs of K (5) and Na (1.5) were higher. Cs and K concentrations in fruit bodies at different maturity stages were almost constant. The concentration ratio of Cs/K is constant in the pileus regardless of the pileus tissues. These results demonstrate that Shiitake non-specifically accumulates Cs while accumulating the essential element K and provide evidence that no selective Cs accumulation (or binding) sites exist within the Shiitake fruit body. Furthermore, the present results show that most accumulated Cs quickly leaches out from the dead fruit body with exposure to water. The leached Cs was largely adsorbable on clay minerals, suggesting that the Shiitake fruit body likely contains Cs in the cation form. Copyright © 2021 Elsevier Ltd. All rights reserved.

Citation

Fabiola Guido-Garcia, Fuminori Sakamoto, Karine David, Naofumi Kozai, Bernd Grambow. Radiocesium in Shiitake mushroom: Accumulation in living fruit bodies and leaching from dead fruit bodies. Chemosphere. 2021 Sep;279:130511