2022 Fiscal Year Annual Research Report

Cesium transfer factor analysis in log-grown shiitake mushrooms combining field surveys and laboratory experiments

Research Project

Project/Area Number	18K05739
Research Institution	The University of Tokyo
Principal Investigator	OBrien Martin 東京大学, 大学院農学生命科学研究科(農学部), 特任准教授 (00723595)
Co-Investigator(Kenkyū-buntansha)	二瓶直登福島大学, 食農学類, 准教授 (50504065) 田野井慶太朗東京大学, 大学院農学生命科学研究科(農学部), 教授 (90361576)
Project Period (FY)	2018-04-01 – 2023-03-31
Keywords	log / shiitake / stable cesium / 133Cs / transfer factor / TF / potassium
Outline of Annual Research Achievements	Neither nitrogen concentration in logs or the pH of the logs correlated significantly with the log-to-shiitake TF of total or exchangeable Cs-133. However, for one of the shiitake strains, we found that higher concentration of nitrogen in logs correlated with a lower log-to-shiitake TF for total Cs-133 (r = -0.833, P<0.05) but not for exchangeable Cs-133 (r= -0.543, P>0.05). This observation was not seen in either of the other two shiitake strains. To optimise culturing shiitake in vitro, we used two different shiitake strains and a combination of the two strains (i.e., three “strains” in total) and grew all three “strains” under the best four culturing conditions we established previously. We need to continue to optimise the culturing conditions further to produce full size fruiting bodies.

(1 results)