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非光合成の捕食者は 赤い藻類の姉妹です
Ryan M R Gawryluk1,2, Denis V Tikhonenkov3,4, Elisabeth Hehenberger5,6
1Department of Botany, University of British Columbia, Vancouver, British Columbia, Canada. ryangawryluk@uvic.ca.
Nature
|July 19, 2019
まとめ
赤い藻類 (Rhodophyta) の進化に関する我々の理解を 挑戦しています これらの生物は,光合成の親類とは異なり,捕食性であり,鞭打ち性であり,初期アーカイプラスティダではミクストロフィーが持続していたことを示唆している.
科学分野:
- ユカリオットの進化
- 系統遺伝学
- 藻類の生物学
背景:
- ロドフィタ (赤い藻類) はアーカイプラスティダ内の多様な系統で,光自己育成と小さなゲノムやフラゲルの欠如のような派生特性が特徴です.
- アーカイプラスティダの初期の進化を再構築することは,系統と不明確な系統遺伝関係の間の大きな違いのために困難です.
研究 の 目的:
- 新しいエウカリオット属であるロデルフィディアを記述し,ロドフィータとの遺伝関係を調査する.
- 赤い藻類の起源と 進化の歴史を理解するために
主な方法:
- ロデルフィディアの進化的位置づけを決定するために,系統遺伝学分析が用いられた.
- ロデルフィディアとロドフィータの形態学とゲノム学的特徴の比較分析
主要な成果:
- Rhodelphidiaは,Rhodophytaと密接に関連した新しい属である.
- ロデルフィス種は赤い藻類とは正反対の特徴を示します. 遺伝子に富んだ非光合成性,鞭状の捕食動物です.
- ローデルフィスのプラスティド欠乏した残骸が,ヘム合成に関与している可能性が高い.
結論:
- ロデルフィディアの発見は,ロドフィータの起源とアーカイプラスティダの進化に関する見解を大きく変える.
- ミクストロフィックな栄養 (捕食と光栄養) は,以前考えられていたよりもアーカイプラスティダの進化に長続きした.
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