Radiocesium in Shiitake mushroom: Accumulation in living fruit bodies and leaching from dead fruit bodies. (September 2021)

• Record Type: Journal Article
• Authors: Guido-Garcia, Fabiola; Sakamoto, Fuminori; David, Karine; Kozai, Naofumi; Grambow, Bernd
• Is Part Of: Chemosphere. Volume 279(2021)
• Publication Date: 2021-09
• Subjects: Radiocesium -- Potassium -- Mushroom -- Lentinula edodes -- Shiitake -- Accumulation -- Distribution -- Leaching; Pollution -- Periodicals; Pollution -- Physiological effect -- Periodicals; Environmental sciences -- Periodicals; Atmospheric chemistry -- Periodicals; 551.511
• DOI: 10.1016/j.chemosphere.2021.130511
• Languages: English
• ISSNs: 0045-6535

Abstract

Abstract: 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 137 Cs in the mushroom bed before culture was bioavailable, the transfer factor (TF) of Cs ( 133 Cs and 137 Cs) 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. Graphical abstract: Image 1 Highlights: No selective accumulation site for Cs was identified in the Shiitake fruit body. Shiitake absorbs Cs along with K at a consistent Cs/K molar ratio. Cs in Shiitake is likely present as dissolved cations in the fruit body fluid.