| Project/Area Number |
18H03392
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Review Section |
Basic Section 64010:Environmental load and risk assessment-related
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| Research Institution | Kagoshima University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
一谷 勝之 鹿児島大学, 農水産獣医学域農学系, 准教授 (10305162)
山本 正浩 国立研究開発法人海洋研究開発機構, 超先鋭研究開発部門(超先鋭研究プログラム), 研究員 (60435849)
武内 章記 国立研究開発法人国立環境研究所, 環境計測研究センター, 主任研究員 (10469744)
神崎 亮 鹿児島大学, 理工学域理学系, 准教授 (50363320)
冨安 卓滋 鹿児島大学, 理工学域理学系, 教授 (60217552)
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| Project Period (FY) |
2018-04-01 – 2021-03-31
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| Project Status |
Completed (Fiscal Year 2020)
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| Budget Amount *help |
¥17,810,000 (Direct Cost: ¥13,700,000、Indirect Cost: ¥4,110,000)
Fiscal Year 2020: ¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000)
Fiscal Year 2019: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2018: ¥10,400,000 (Direct Cost: ¥8,000,000、Indirect Cost: ¥2,400,000)
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| Keywords | コメ / 水銀汚染 / メチル水銀 / 土壌 / 水田 / 無機水銀 / 汚染 / 土壌汚染 / 水銀 / 稲 / 化学形態 |
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| Outline of Final Research Achievements |
To investigate the accumulation of methylmercury in rice grains, the uptake behavior of mercury by rice plant was examined through hydroponic experiments, which involved addition of mercury to the culture solution. In addition, the formation of methylmercury from mercury ion in waterlogged soil and the uptake of the formed methylmercury by rice plant were investigated. The results of hydroponic experiments showed that mercury ion and methylmercury, added to the culture solution, accumulated in the roots, and only methylmercury was transferred to the ears during ear growth. The concentration of methylmercury in the waterlogged soil fluctuated greatly during the rice cultivation period, with and without rice plants. Of note, methylmercury concentration increased with decreasing soil redox potential; however, with further decrease in soil redox potential, methylmercury concentration decreased.
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| Academic Significance and Societal Importance of the Research Achievements |
本研究は，水銀汚染を受けた水田土壌でのメチル水銀生成と，コメのメチル水銀汚染について検討を進めたものである．水耕栽培実験により，根から吸収されたメチル水銀の状況がコメの水銀濃度に与える影響を確認した．また土壌でのメチル水銀生成は，稲の成長とは関係なく育成期間の間に大きく変動し，また土壌の水銀形態がメチル水銀生成に与える影響が大きいことを確認した．人体への影響は今後の課題となるが，コメは世界人口半分の主食であり，そのコメのメチル水銀汚染がどのように起こるのか詳細に調べた本研究成果の社会的意義は大きいと言える．
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