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Antirrhinumの花の色の変化を支える進化の経路
Annabel C Whibley1, Nicolas B Langlade, Christophe Andalo
1Department of Cell and Developmental Biology, John Innes Centre, Colney Lane, Norwich NR4 7UH, UK.
Science (New York, N.Y.)
|August 19, 2006
まとめ
Antirrhinumの花色進化はU型遺伝子型経路によって導かれ,適応を可能にすると同時に,低適格性のハイブリッドを避ける. この進化の軌道は,ハイブリッドゾーンで観察された急な遺伝的傾向を説明する.
科学分野:
- 進化生物学の進化生物学について
- 遺伝学 遺伝学とは
- 植物学は植物科学である.
背景:
- 進化の経路を理解することは,生物の多様性を説明する上で極めて重要です.
- Antirrhinum (スナップドラゴン) の花の色の変異は,進化の軌道を研究するためのモデルを示しています.
研究 の 目的:
- Antirrhinumの花の色進化を支配する遺伝子型空間を定義し,分析する.
- 異なる花の色変異の間のハイブリッドゾーンを形作る進化的力を調査する.
主な方法:
- Antirrhinumの花の色変異をマッピングするために3次元遺伝子型空間を定義しました.
- ハイブリッドゾーン内の遺伝子クリンを分析し,選択中のロキスを特定しました.
- ゲノタイプ空間内の多様なAntirrhinumフェノタイプの分布を特徴づけた.
主要な成果:
- 花の色を制御する遺伝子の急な遺伝的傾きが観察され,選択を示しています.
- Antirrhinumの種は,遺伝子型空間でU型分布を形成した.
- 異なった形状の間のハイブリッド化は,低フィットネスの遺伝子型をもたらした.
結論:
- U形の遺伝子型雲は,花の色適応の可動的な進化の経路を表しています.
- この経路は,適応性が低い遺伝子型領域を回避しながら,進化を容易にする.
- このモデルは,異なった系統間のハイブリッド化のフィットネスコストによるハイブリッドゾーンの急な斜面を説明しています.
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