転写因子の調節の変化は,栽培トマトのオートガミーを引き起こす
Kai-Yi Chen1, Bin Cong, Rod Wing
1Department of Plant Breeding and Genetics, Cornell University, Ithaca, NY 14853, USA.
まとめ
研究者は,トマトのスタイル長さと自己受粉の進化を制御する遺伝子であるStyle2.1をクローン化しました. タンパク質の変化ではなく,プロモーターの突然変異が Style2.1 表現の減少を引き起こし,自己受粉を可能にしました. この発見は,植物の生殖戦略に光を当てています.
科学分野:
- 植物遺伝学 植物遺伝学
- 進化生物学の進化生物学について
- 発達生物学 発達生物学とは
背景:
- 自己受粉は,開花植物における重要な進化的移行である.
- スタイルの長さは,受粉メカニズムに影響を与える重要な花の特徴です.
- 栽培トマトは,授粉戦略の多様性を示しています.
研究 の 目的:
- トマトのスタイルの長さの変化の遺伝的根拠を特定するために.
- 自己受粉の進化の基礎となる分子メカニズムを理解する.
- スタイルの長さを制御する定量的な特性の位置 (QTL) をクローンし,特徴づけます.
主な方法:
- トマトの集団における定量的な特徴の場所 (QTL) のマッピング.
- スタイル2.1の基因クローニングと配列決定.
- 花の発達中の遺伝子発現パターンの分析.
- 規制変異を特定するためのプロモーター分析.
主要な成果:
- スタイル長さの主要なQTLであるStyle2.1がクローンされました.
- Style2.1は,細胞の伸びを調節する推定転写因子をコードする.
- コード配列ではなく,Style2.1プロモーターの突然変異が確認されました.
- このプロモーター変異は,自己受粉と相関する,下調調節された Style2.1 表現につながります.
結論:
- トマトの自己受粉の進化は,Style2.1表現の変化した調節と関連しています.
- 遺伝子調節の変化,特にプロモーター変異は,主要な進化的移行を促す可能性があります.
- スタイル2.1は,交差受粉から自己受粉への移行における重要な遺伝的要因である.
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