リゾスフィアの微生物コミュニティの構造における高窒素誘発の変化は,米の爆発に対する病気の感受性を調節することができます
Mehwish Roy1, Gnanendra Shanmugam1, Suvin Park1
1Department of Biotechnology, Yeungnam University, Gyeongsan, 38541, Gyeongbuk, Republic of Korea.
Environmental microbiome
|February 14, 2026
まとめ
米中の過剰な窒素 (N) は,根球微生物群を変化させることで,マグナポルテ・オライゼ (Magnaporthe oryzae) への感受性を高めます. この微生物のシフトは,植物の防御を抑制し,病気を促進する持続的な効果を生み出します.
科学分野:
- 植物病理学 植物病理学
- マイクロバイオーム研究
- アグロノミーは農学です.
背景:
- の窒素誘発感受性 (NIS) は,過剰な窒素によるマグナポルテ・オライザエに対する脆弱性の増大によって特徴付けられており,そのメカニズムは理解されていない.
- NISを媒介する根球微生物群の役割は,以前は確立されていなかった.
研究 の 目的:
- 過剰な窒素,リゾスフィアの微生物群,および米の窒素誘発の感受性とのメカニズム的関連を解明する.
- 高い窒素濃度の米根球微生物群の組成と機能にどのような影響を与えるかを調査する.
- リゾスフィアの微生物群が防御遺伝子の抑制と疾患の感受性を媒介するかどうかを判断する.
主な方法:
- 植物成長から窒素効果を切り離す実験システムを利用した.
- 異なる窒素条件と病原体感染下で,米の根球における細菌と真菌の共同体の組成を分析した.
- 微生物コミュニティの機能プロファイリングとネットワーク分析を行いました.
- 感染した高Nのドナーから標準Nの受容者に微生物移植実験を行いました.
主要な成果:
- 高窒素は,リゾスフィアのバクテリアと真菌のコミュニティを大幅に変化させ,OsPAL06とOsPR10bのような防御遺伝子を抑制しました.
- 機能的プロファイリングは,高窒素下でのサリシラート分解経路の濃縮を示した.
- 窒素処理と病原体感染は相互作用し,根球のコミュニティ構成に影響を与え,微生物の接続性とキーストーン分類を減少させた.
- 感染した高Nのドナーからのマイクロバイオーム移植は,NISを複製し,受容者の防御遺伝子発現を抑制しました.
結論:
- 過剰な窒素は,免疫調節の可能性を備えたリゾスフィアの微生物群の構成を促進し,栄養状態を超えて持続します.
- リゾスフィアの微生物群は,米の窒素誘発感受性の重要な決定因子です.
- 発見は,米作りの病気管理のための微生物情報,栄養素意識の戦略の開発を支援しています.
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