Volume 37, Number C1, February 2002ECORAD 2001: The Radioecology - Ecotoxicology of Continental and Estuatine Environments
|Page(s)||C1-347 - C1-352|
|Published online||14 October 2009|
Cesium uptake by edible mushrooms and microorganisms isolated from mushroom substrata
Division of Environmental Health, Kanagawa Prefectural Public Health Laboratory, Asahi-ku, Yokohama 241-0851, Japan
2 Department of Radiological Health, National Institute of Public Health, Minato-ku, Tokyo 108-8638, Japan
3 Department of Microbiology, School of Pharmaceutical Sciences, Toho University, Funabashi, Chiba 274-8510, Japan
The concentrations of 137Cs and stable Cs were measured in wild mushrooms, mushroom substrata and soils from Mt.Fuji in Japan. We then studied the Cs uptake by the edible mushroom, Pleurotus ostreatus, through the cultured experiments using 137Cs and/or a stable Cs tracer. 137Cs concentrations in the fruiting bodies were 2-4 orders of magnitude higher than those in the wild mushrooms collected in Japan. It was demonstrated that 137Cs and Cs were actively uptaken by the mushrooms depending on the 137Cs or Cs concentration in the medium. We subsequently investigated the Cs sensitivity of microorganisms in the mushroom substrata and Cs uptake by actinomycetes, one of the soil microorganisms in mushroom substrata. The number of both bacteria and actinomycetes in the substrata decreased with increasing Cs concentration in the medium. Actinomycetes in the mushroom substrata were more sensitive to Cs than other bacteria. In the presence of 5mM CsCl, Cs uptake by several strains of actinomyces was generally high, and the growth was partially inhibited compared with the Cs resistant strains, Streptomyces lividans TK24 and Streptomyces sp. TOHO-2.
© EDP Sciences, 2002
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