クリプトファイト藻は,海洋シリアスメソディニウム・ルーブルムによって臓器細胞を奪われる
D E Gustafson1, D K Stoecker, M D Johnson
1University of Maryland, Center for Environmental Science, Horn Point Laboratory, Cambridge 21613, USA. gustafsn@hpl.umces.edu
Nature
|July 13, 2000
まとめ
メソディニウム・ルーブルム (Mesodinium rubrum) は,海洋プランクトンのシリアートであり,赤い潮を形成することができる. この研究は,藻類を摂取し,臓器を盗むことを明らかにし,永久性エンドシンビオントとしての分類に異議を唱える.
科学分野:
- マリン・バイオロジーの海洋生物学
- プロティストロジー プロティストロジー
- 細胞生物学 細胞生物学
背景:
- メソディニウム・ルーブルム (Mesodinium rubrum) (旧名:ミリオネクタ・ルーブラ) は,一般の光合成性海洋シリアートである.
- 沿岸の赤い潮を形成することが知られており,長い間科学的に興味を惹かれています.
- その分類は,特に藻類のエンドシンビオントとの関係に関して,議論されている.
研究 の 目的:
- メソディニウム・ルーブルムの栄養メカニズムとエンドシンビオントの関係を調査する.
- 暗号植物藻への曝露がM. rub.rumにどのように影響するかを決定する.
- このユニークな原生体の細胞および機能的分類を明確にするために.
主な方法:
- メソドニウム・ルーブルムをクリプトファイト藻に暴露した栄養実験が行われました.
- 摂取と臓器細胞の獲得を観察するために,顕微鏡と生理学的分析が行われました.
主要な成果:
- メソドニウム・ルーブルム (Mesodinium rubrum) は,サイトストーム (口腔) が欠如しているにもかかわらず,暗号植物藻を摂取することが観察されました.
- シリア体は,摂取した藻から,機能的なクロロプラストやその他の臓器細胞を積極的に盗みます.
- 証拠によると,M. rubrumは永続的なエンドシンビオントを維持できない可能性があり,その代わりに獲得した臓器細胞に依存している.
結論:
- メソディニウム・ルーブルムは,伝統的な細胞や機能的なカテゴリーに適合しないユニークな"キメラ"を表しています.
- 臓器の盗難 ("強盗") は,その栄養と生存のための重要な戦略であるようです.
- これは,M. rubrumが恒久的な藻類のパートナーを持つ単純な光合成のシリアートであるという長年にわたる見解に異議を唱える.
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