2019 Fiscal Year Final Research Report
Response mechanisms to a fluctuating environment through long-distance signaling
| Project Area | Integrative system of autonomous environmental signal recognition and memorization for plant plasticity |
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| Project/Area Number |
15H05957
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| Research Category |
Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)
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| Allocation Type | Single-year Grants |
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| Review Section |
Biological Sciences
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| Research Institution | Nagoya University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
望田 啓子 (桑田啓子) 名古屋大学, トランスフォーマティブ生命分子研究所, 特任助教 (70624352)
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| Project Period (FY) |
2015-06-29 – 2020-03-31
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| Keywords | ペプチドホルモン / シロイヌナズナ / 窒素代謝 / 受容体キナーゼ |
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| Outline of Final Research Achievements |
Nitrogen (N) is an essential macronutrient that plays a crucial role throughout plant development, but soil nitrate availability fluctuates temporally and spatially. We identified that N starvation-induced peptide CEP acts as a root-derived ascending N-demand signal. CEP is recognized in the shoot by CEP receptor, that leads to the production of non-secreted polypeptide, CEPD. CEPD acts as a descending signal to the root and ultimately upregulates nitrate transporter NRT2.1 gene in the roots. Thus, CEP induced on one side of the roots by local N starvation is able to mediate upregulation of NRT2.1 in the distant part of the roots. In addition to this, plants modulate the efficiency of root N acquisition in response to shoot N demand by CEPD-like 2, which is upregulated in the leaf vasculature in response to decreased shoot N status. Our findings provide new insights into the molecular basis of plant adaptation to a dynamically fluctuating N environment.
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| Free Research Field |
植物分子・生理学
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| Academic Significance and Societal Importance of the Research Achievements |
本研究により，全身的窒素要求シグナリングの主要コンポーネントを見出したが，この発見は，植物が局所的環境受容と長距離シグナル伝達との統御に独自のメカニズムを進化させていることを示すものである．また，「維管束は単なる水や栄養の通り道ではなく，組織間を結ぶ情報伝達の場」であり，「気孔からの水分の蒸発によってできる蒸散流が，長距離シグナルの増幅や維管束内での情報伝達に重要な役割を果たしている」など，これまでの理解を覆すような新たな概念を確立した．
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