Elucidation of synergy effect of mushroom and soil bacteria on radioactive cesium dissolution from forest soil

2019 Fiscal Year Final Research Report

• Project/Area Number: 18K18210
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 64010:Environmental load and risk assessment-related
• Research Institution: Japan Atomic Energy Agency
• Principal Investigator: Guido-Garcia Fabiola 国立研究開発法人日本原子力研究開発機構, 原子力科学研究部門 原子力科学研究所 先端基礎研究センター, 博士研究員 (90805798)
• Project Period (FY): 2018-04-01 – 2020-03-31
• Keywords: きのこ / 福島 / セシウム / 循環

Outline of Final Research Achievements

Qualitative analysis of organic acids produced by several mushroom species revealed that they produce several kinds of known organic acids and some of them are commonly produced by tested mushrooms. When a clay mineral on which 137Cs was adsorbed beforehand was exposed to aqueous solutions of organic acids, 137Cs was hardly dissolved from the clay mineral. Next, some bacteria with ability to produce siderophore which is an iron chelating organic substance were isolated from soil. When biotite (a mica type clay mineral) was exposed to a suspension containing cells of one of the bacteria or one of mushroom mycelia, mushroom mycelia cells dissolved more Fe and Si from biotite. This result suggests that the tested mushroom secretes yet-to-be identified organic substances with high ability to dissolve biotite.

Free Research Field

環境動態

Academic Significance and Societal Importance of the Research Achievements

きのこは土壌からのCs吸収力が高いと言われているが、その機構はほとんど未解明である。一方、シデロフォアを分泌する細菌が鉱物を溶解し、その結果Csが生物に吸収されている可能性が高いと考えられている。本研究では、きのこも鉱物を溶解する可能性が高いことを示唆する結果を得た。鉱物溶解にかかるきのこの生産物を特定することは、森林におけるCs循環機構解明のため重要である。