擬似応答調節器Ppd-H1は,大麦の光周期への適応を可能にします
Adrian Turner1, James Beales, Sébastien Faure
1Crop Genetics Department, John Innes Centre, Norwich Research Park, Colney, Norwich NR4 7UH, UK.
Science (New York, N.Y.)
|November 15, 2005
まとめ
麦の開花時間は,偽反応の調節体であるPPD-H1遺伝子によって制御されます. 減少したPpd-H1機能は,昼夜間の遺伝子発現を変化させ,開花を遅らせ,春に蒔く作物に恩恵をもたらします.
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:
- 光周期 (日の長さ) は,植物の開花時間を調節し,作物の適応に影響を与える上で極めて重要です.
- 光周期反応の遺伝的多様性は,作物の改良と多様な農業慣行に不可欠です.
- Ppd-H1遺伝子は,大麦の光周期感受性を制御する重要な要因として認識されています.
研究 の 目的:
- 小麦の光周期反応を制御する主要な遺伝子を特定するために.
- Ppd-H1が開花時間を調節する分子機構を解明する.
- 春に蒔く大麦の品種における適応の遺伝的基礎を理解する.
主な方法:
- Ppd-H1遺伝子を特定するためにポジショナルのクローニングが採用されました.
- フォトペリオド経路遺伝子の循環的発現パターンを分析した.
- CONSTANSとFTの遺伝子発現レベルは,野生型と変異種大麦で定量化されました.
主要な成果:
- ポジショナルのクローニングにより,Ppd-H1は,大麦の光周期性を制御する擬似応答の調節体として特定されました.
- ppd-H1変異体は,光周期反応性が低下しており,春に蒔く品種には有益です.
- コンスタンス (CONSTANS) の変化した昼夜表現と,FT表現の減少が,ppd-H1変異型現象型の根底にある.
結論:
- Ppd-H1は,昼間の時計内で機能する,大麦の光周期反応の決定的決定因子です.
- Ppd-H1による開花時間の遺伝的調節は,異なる環境への作物の適応のためのメカニズムを提供します.
- Ppd-H1の機能を理解することで,花期に合わせた大麦の品種を育てるための洞察が得られます.
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