2022 Fiscal Year Final Research Report
Research on improvement of dry land plant fitness by root endophytic microbial community assembly process
| Project/Area Number |
20K06126
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 40010:Forest science-related
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| Research Institution | Tottori University |
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Principal Investigator |
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| Project Period (FY) |
2020-04-01 – 2023-03-31
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| Keywords | Nitrogen-fixing bacteria / Mycorrhizal fungi / Drought / Metagenome / Drylands / Desert plant / Metabolome / Ionome |
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| Outline of Final Research Achievements |
The microbial community and function of symbiotic microbial communities on the roots of plants growing in the Colorado Desert, California, USA, were investigated. Microbial infection of desert plant roots was related to season and functionality, with nitrogen-fixing bacteria in winter and arbuscular mycorrhizal fungi promoted in summer. Growth of desert plants was also promoted by the presence of microorganisms even at 5% soil moisture content, indicating that microorganisms are important even under arid conditions. Leaf metabolites and ions were examined and differences were observed under wet and dry conditions, suggesting that these were influenced by the microbial community while also affecting the microbial community.
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| Free Research Field |
微生物生態学
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| Academic Significance and Societal Importance of the Research Achievements |
植物の根に共生する微生物は植物の生育や土壌形成に重要であるが、その乾燥ストレス条件下での重要性と機能については不明な点が多かった。また、実際のフィールドにおける農業や環境修復に微生物を用いる際、実験室で得られるような効果を得られないケースも多い。本研究では、根の部位別に乾燥、および湿潤条件下で植物の成長と関与する微生物機能に着目することで、乾燥条件下でも微生物機能は重要であること、そして季節ごとに植物と共生する有用微生物は異なることを明らかにした。この知見は、季節による環境の変化を考慮した複数種の微生物利用によって、フィールドでの微生物の効果が高まることを示すものである。
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