Molecular mechanisms of regulating the phosphorus acquisition pathway during mycorrhizal formation.

2022 Fiscal Year Final Research Report

• Project/Area Number: 20K05763
• 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: Hokkaido University
• Principal Investigator: Maruyama Hayato 北海道大学, 農学研究院, 助教 (10633951)
• Project Period (FY): 2020-04-01 – 2023-03-31
• Keywords: 菌根形成 / 土壌中リン / 遺伝子共発現ネットワーク

Outline of Final Research Achievements

In this study, a mycorrhizal model plant, Brachypodium distachyon, was used to investigate the solubilization and uptake mechanisms of phosphorus in the soil. Mycorrhizal formation and function varied throughout the growing stage depending on the nutrient status in the soil, and different mycorrhizal species showed significantly different mechanisms of expression of symbiosis- and nutrient-acquisition-related genes in the roots. In addition, root gene expression and soil phosphorus levels in root-divided plants suggest that phosphorus acquisition strategies, such as phosphorus solubilization and uptake, were regulated in response to local mycorrhizal formation. These findings provide insight into the nutrient conditions and species-specific responses of mycorrhizal plants and the regulatory mechanisms of phosphorus acquisition by locally formed mycorrhizae in roots.

Free Research Field

植物栄養学

Academic Significance and Societal Importance of the Research Achievements

作物によるリンの効率的な獲得を目指す上で、アーバスキュラー菌根(AM)菌との共生した根(菌根)におけるリンの獲得機構を理解する必要がある。本研究に置いて菌根形成植物の養分条件や菌種特徴的な応答および根の局所的な菌根形成によるリン獲得制御機構が存在し、その制御に関わる遺伝子群を同定することができた。この成果は今後、菌根利用能を強化したコムギやトウモロコシを代表とする作物育種などにおいて重要な遺伝資源になりうる。AM菌活用力とリン可給化力を効率的に制御し、土壌リン栄養に応じたリン吸収が可能な植物体が実現できれば、枯渇が懸念されるリン資源の有効利用や施肥削減に大きく貢献できる。