Studies on the molecular mechanism of iodine reduction in rhizosphere

2021 Fiscal Year Final Research Report

• Project/Area Number: 19K05756
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 38010:Plant nutrition and soil science-related
• Research Institution: Saga University
• Principal Investigator: Sho NISHIDA 佐賀大学, 農学部, 准教授 (40647781)
• Co-Investigator(Kenkyū-buntansha): 山上 睦 公益財団法人環境科学技術研究所, 環境影響研究部, 副主任研究員 (60715499)
• Project Period (FY): 2019-04-01 – 2022-03-31
• Keywords: ヨウ素 / 根圏 / グルタチオン / シロイヌナズナ

Outline of Final Research Achievements

In this study, we aimed to identify a molecule causing the reduction of IO3- to I- in rhizosphere and the causal gene using the model plant Arabidopsis thaliana for revealing the mechanism underlying iodine reduction by plants. We revealed that glutathione secreted from roots reduces IO3- to I- in the rhizosphere of A. thaliana and glutathione synthase gene GSH1 is involved in the IO3- reduction activity of roots. In addition, our data suggest that NADPH oxidases localized at the plasma membrane of root cells are also involved in the reduction of IO3- in the rhizosphere.

Free Research Field

植物栄養学

Academic Significance and Societal Importance of the Research Achievements

本研究成果は、地球環境におけるヨウ素循環の解明およびヨウ素動態の予測技術に貢献することが期待され、放射性ヨウ素を放出する核資源を安全に管理・活用する上で極めて重要な知見となる。これに加え、ヒトのヨウ素欠乏症抑制を目的としたヨウ素濃度を強化した作物の育成技術に繋がることが期待できる。