"緑の革命"の遺伝子は,変異したギブベレリンの応答調節器をコードする
J Peng1, D E Richards, N M Hartley
1John Innes Centre, Norwich Research Park, UK.
Nature
|July 27, 1999
まとめ
緑の革命とは
科学分野:
- 植物遺伝学 植物遺伝学
- 分子生物学は分子生物学である.
- 農業科学 農業科学とは
背景:
- 緑の革命は,新しい半矮小の品種を用いて,世界の小麦の収穫量を大幅に増加させた.
- これらの半矮小麦は,植物ホルモンGibberellinに対する反応性が低下しています.
- 低身長 (Rht) 遺伝子,特にRht-B1とRht-D1は,この矮小化特性を授与する.
研究 の 目的:
- 農作物の矮小化におけるギベレリンの無感性の分子基礎を調査する.
- アラビドプシスGAI.に関連する他の種におけるオートロゴス遺伝子を特定する.
- 農作物の収穫量の改善のためにこれらの遺伝子を操作する可能性を調査する.
主な方法:
- 比較ゲノミクスを用いて,オートロゴス遺伝子を特定する.
- Rht-B1/Rht-D1とトウモロコシd8.8.の変異アレル解析
- 変異GAIアレルを持つトランスジェニックの米植物を用いた機能分析.
主要な成果:
- Rht-B1/Rht-D1とトウモロコシd8は,アラビドプシスGAI.のオーソログとして識別されています.
- これらの遺伝子の変異性アレルは,保存されたN端のギブベレリンのシグナル伝達領域を変化させます.
- 変異GAIを持つトランスジェニックライスは,ギベレリンの反応が低下し,矮小化を示した.
結論:
- GAI遺伝子とそのオートロゲンは,ギベレリンのシグナル伝達と植物の高さに重要な役割を果たします.
- GAIのオルトロジの保存ドメインの変異は,ギベレリン反応の減少と矮小化につながります.
- GAIのオーソログを操作することは,様々な種で作物の収穫を増やすための潜在的な戦略を提供します.
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