イネのOUR1/OsbZIP1-OsPIN9制御モジュールは、イネのクラウンルーツ形成を制御するオーキシン依存性
Yihao Dong1, Cornelius Mbathi Wainaina2, Takaaki Kojima3
1Graduate School of Bioagricultural Sciences, Nagoya University, Nagoya, Japan.
Frontiers in plant science
|December 25, 2025
まとめ
新規bZIP転写因子であるOUR1/OsbZIP1は、イネのクラウンルーツ(CR)の発達を制御します。OUR1/OsbZIP1機能の喪失は、直接の標的遺伝子であるOsPIN9のアップレギュレーションによってCR形成を促進します。
科学分野:
- 植物生物学
- 分子遺伝学
- 農業科学
背景:
- クラウンルーツ(CR)の発達は、イネのルーツ構造、栄養吸収、および収量にとって重要です。
- PINタンパク質を介した極性オーキシン輸送はCR形成に不可欠ですが、その転写制御は完全には理解されていません。
研究 の 目的:
- イネのCR発達におけるオーキシン流出キャリアOsPIN9の転写制御を調査します。
- CR形成におけるbZIP転写因子OUR1/OsbZIP1の役割を解明します。
主な方法:
- OUR1/OsbZIP1の標的を同定するための遺伝子発現解析。
- イネ変異体におけるCR表現型解析。
- オーキシンシグナル伝達およびCR開始レギュレーターの発現解析。
主要な成果:
- OUR1/OsbZIP1は直接OsPIN9の発現を標的とし、ダウンレギュレーションします。
- OUR1/OsbZIP1機能の喪失は、OsPIN9アップレギュレーションに依存してCR形成を強化します。
- OUR1/OsbZIP1変異体におけるOsPIN9アップレギュレーションは、オーキシンシグナル伝達およびCR開始レギュレーター(CRL1、CRL5、OsWOX11)と相関します。
結論:
- 新規OUR1/OsbZIP1-OsPIN9制御モジュールは、オーキシン輸送とシグナル伝達を統合します。
- このモジュールは、栄養豊富な条件下でのイネCR発達の制御において重要な役割を果たします。
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