Effects of fluctuation of redox potentials on microbial dynamics and gas metabolisms of wetland soils
| Project/Area Number |
16H05056
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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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| Research Field |
Environmental agriculture(including landscape science)
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| Research Institution | Nagoya University |
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Principal Investigator |
Murase Jun 名古屋大学, 生命農学研究科, 教授 (30285241)
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| Co-Investigator(Kenkyū-buntansha) |
浅川 晋 名古屋大学, 生命農学研究科, 教授 (50335014)
渡邉 健史 名古屋大学, 生命農学研究科, 講師 (60547016)
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| Research Collaborator |
HAYASHI Kentaro
TOKIDA Takeshi
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| Project Period (FY) |
2016-04-01 – 2019-03-31
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| Project Status |
Completed (Fiscal Year 2018)
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| Budget Amount *help |
¥17,680,000 (Direct Cost: ¥13,600,000、Indirect Cost: ¥4,080,000)
Fiscal Year 2018: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
Fiscal Year 2017: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
Fiscal Year 2016: ¥11,440,000 (Direct Cost: ¥8,800,000、Indirect Cost: ¥2,640,000)
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| Keywords | 水田 / 酸化還元境界層 / 微生物 / メタン / 鉄酸化 / 原生生物 / 微生物群集構造 / 微生物間相互作用 / 酸素 / 微生物相互作用 |
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| Outline of Final Research Achievements |
Focusing on paddy soil, we analyzed the fluctuation of the redox boundary layer and the response of the microbial community. In the paddy soil surface layer, the dissolved oxygen concentration showed extremely large fluctuation from supersaturation to complete anoxia. The oxidation-reduction potential also changed dramatically in the paddy rice rhizosphere according to the growth of rice. Protozoa living in paddy soils are considered to play an important role as a predator in the redox boundary layer, as there are groups with suitable oxygen concentration or redox potential and a group adaptable to a wide range of oxygen concentrations. Although methane oxidation bacteria require oxygen for methane oxidation, they were able to maintain their activity for a long time even under anaerobic conditions. Microaerobic iron-oxidizing bacteria act in the surface.
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| Academic Significance and Societal Importance of the Research Achievements |
酸化還元境界層は、多くの重要な微生物代謝が進行するホットスポットであるが、厚さ数ミリの酸化還元境界層の中での劇的な化学的濃度勾配に応じた微生物の群集や活性の空間分布の詳細はほとんど分かっていなかった。本研究では、酸化還元境界層が大きなゆらぎを有していることを実証するとともに、境界層で微生物がサブミリスケールの住み分けを行なっている実態を明らかにした。また物質循環の鍵を担う微生物群集の境界層のゆらぎに対する応答を検証した。本研究の成果から、酸化還元境界層における環境変動が微生物の生態や温室効果ガスであるメタンの動態に及ぼす影響を微生物サイズの視点に立ったスケールで解析することの重要性が示された。
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Report
(4 results)
Research Products
(17 results)
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[Journal Article] Ferrigenium kumadai gen. nov., sp. nov., a microaerophilic iron-oxidizing bacterium isolated from a paddy field soi2018
Author(s)
Khalifa, A., Nakasuji, Y., Saka, N., Honjo, H., Asakawa, S., and Watanabe, T.
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Journal Title
Int. J. Syst. Evol. Microbiol.
Volume: 68
Issue: 8
Pages: 2587-2592
DOI
Related Report
Peer Reviewed / Int'l Joint Research
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