2023 Fiscal Year Final Research Report
Elucidation of holobiont co-evolution mechanism by analyzing aquatic plant-surface symbiotic bacteria interactions
| Project/Area Number |
21K18239
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| Research Category |
Grant-in-Aid for Challenging Research (Pioneering)
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| Allocation Type | Multi-year Fund |
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| Review Section |
Medium-sized Section 45:Biology at organismal to population levels and anthropology, and related fields
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| Research Institution | Hokkaido University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
小山 時隆 京都大学, 理学研究科, 准教授 (30324396)
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| Project Period (FY) |
2021-07-09 – 2024-03-31
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| Keywords | ホロビオント / 共生 / ウキクサ / 植物成長促進細菌 / 相互作用分子機構 |
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| Outline of Final Research Achievements |
In this research project, we focused on the microbial symbiosis of freshwater aquatic plants, and investigated the interaction molecular mechanisms between host plants and surface symbiotic microorganisms from both plant physiological and microbiological studies. Symbiotic bacteria of the genus Acinetobacter and Pseudomonas were shown to produce exopolysaccharides and lipopolysaccharides with different structures, so that they attach to different locations on the host plant and promote its growth. On the other hand, within a plant body, the growth was found to be promoted through the following responses; bacterial adhesion > increased iron utilization efficiency > promotion of nitrogen and chlorophyll metabolism > chloroplast development > increased photosynthetic activity. Furthermore, we discovered that surface symbiotic bacteria of the genus Bacillus promote the growth of host plants through secreting extracellular peptidases.
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| Free Research Field |
環境微生物学
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| Academic Significance and Societal Importance of the Research Achievements |
本研究成果はこれまで未解明であった、淡水水生植物と表層共生微生物による成長促進作用について双方の研究からその分子機構を明らかにした。これは地球生物圏を支える仕組みの一部を理解するものであると共に両者のホロビオントとしての共進化を理解する手がかりを提供する。一方、研究の対象とした淡水水生植物ウキクサは光合成による廃水浄化作用を有し、増殖した植物バイオマスは資源価値が高いことが指摘されているため、ここで得られた知見は省エネ水処理技術および有用バイオマス生産技術にも利用可能であることから、資源循環型低炭素社会基盤の構築にも寄与する。
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