Existence and significance of a nutrient-mediated circadian clock feedback loop between root and shoot

2022 Fiscal Year Final Research Report

• Project/Area Number: 20K21428
• Research Category: Grant-in-Aid for Challenging Research (Exploratory)
• Allocation Type: Multi-year Fund
• Review Section: Medium-sized Section 44:Biology at cellular to organismal levels, and related fields
• Research Institution: Nara Institute of Science and Technology
• Principal Investigator: Endo Motomu 奈良先端科学技術大学院大学, 先端科学技術研究科, 教授 (80551499)
• Project Period (FY): 2020-07-30 – 2023-03-31
• Keywords: 概日リズム / 長距離シグナル伝達 / シロイヌナズナ

Outline of Final Research Achievements

Temporal information is transmitted over short and long distances, and this is thought to be involved in stabilizing circadian rhythms. Although temporal information has been shown to be transferred from the aboveground to the roots at the organ level, the presence or absence of temporal information transfer from the roots to the aboveground is unknown, and how these are involved in stabilizing circadian rhythms is also unknown. In this study, the clock gene PRR7 in roots regulated the potassium absorption rhythm. Furthermore, when the plants were grown in a potassium-deficient medium, the periodicity of the aboveground circadian rhythm was destabilized. This phenomenon was observed even when plants with grafted prr7 roots were grown on normal medium, indicating that prr7 is involved in the stabilization of the circadian rhythm in the aboveground portion of the substratum. Translated with www.DeepL.com/Translator (free version)

Free Research Field

概日時計

Academic Significance and Societal Importance of the Research Achievements

フィードバックループによって概日リズムは安定化していると考えられており、これを遺伝子間、オルガネラ間、細胞間と階層化することでより安定なリズムが形成されていると考えられる。本研究ではこれまでに報告されている地上部→根に加えて、根→地上部の長距離シグナル伝達経路を明らかにしたことで、植物でもっとも大きいレベルである器官間でのフィードバックループを強く示唆する結果を得た。
根の概日時計が栄養シグナルを介して地上部の概日リズムを制御することから、植物工場における水耕栽培などにおいては施肥のタイミングも収量や品質に影響しうることを示唆し、新たな制御ターゲットになると期待される。