肉食のトラップの進化は,平らな葉から遺伝子発現の単純な変化を経た
Christopher D Whitewoods1, Beatriz Gonçalves1, Jie Cheng1,2,3
1Department of Cell and Developmental Biology, John Innes Centre, Norwich Research Park, Colney Lane, Norwich NR4 7UH, UK.
Science (New York, N.Y.)
|November 23, 2019
まとめ
肉食植物Utricularia gibbaは,その上部の葉 (アダキシアル) 遺伝子の活性が制限されたときに罠を形成します. この遺伝子の活動パターンは 進化のシフトを通して カップ型の罠を含む 多様な葉の形を生成する鍵です
科学分野:
- 植物生物学
- 発達遺伝学
- 進化の形態学
背景:
- 葉の形状は単純で平らな構造から肉食植物の罠のような複雑な形状まで,大きな多様性を表しています.
- 植物の進化を理解するには 葉の形を支える遺伝的・発達的メカニズムを理解することが重要です
研究 の 目的:
- 肉食植物Utricularia gibbaの葉の形態の発達におけるアダキシアル (上部) とアバキシアル (下部) の遺伝子活動領域の役割を調査する.
- 極性フィールドに基づく非平面構造を含む多様な葉の形成を説明するモデルを提案する.
主な方法:
- ウトリキュリア・ギッバの葉とトラップの発達中の遺伝子発現パターンの分析
- 葉の形態学に対するアダキシアル遺伝子の活性操作の影響を調査する.
主要な成果:
- Utricularia gibbaでは,アダキシアル領域は,トラップの内層を形成する特定の領域に限定され,トラップの発達に不可欠です.
- 早期の子宮外アダキシアル活動により 落とし穴のない放射状の葉が生じる.
- アダクシアル・アバクシアルとプロキシモディスタル・ポラリティ・フィールドが成長方向を向けて多様な葉の形を生成するモデルが提案されています.
結論:
- アダキシアル遺伝子の精密な空間的制限は,トラップのような特殊な葉の構造の形成に重要な要因である.
- 極性フィールドの相互作用は,カップ状の葉の収束進化を含む多様な葉の形態の進化を理解するための枠組みを提供します.
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