サンゴにおける共生的な窒素固定サイアノバクテリアの発見
Michael P Lesser1, Charles H Mazel, Maxim Y Gorbunov
1Department of Zoology and Center for Marine Biology, University of New Hampshire, Durham, NH 03824, USA. mpl@cisunix.unh.edu
Science (New York, N.Y.)
|August 18, 2004
まとめ
Montastraea cavernosaのようなカリブ海のサンゴは,共生サイアノバクテリアによってオレンジ色から赤色に光しています. これらのバクテリアは窒素を固定し,この重要な栄養素をサンゴの共生に供給する可能性があります.
科学分野:
- マリン・バイオロジー マリン・バイオロジー
- シンビオティック・マイクロバイオロジー
背景:
- 珊瑚の光は一般的ですが,その源は必ずしも明らかではありません.
- Montastraea cavernosaは,はっきりとしたオレンジ色から赤色に光しています.
- 珊瑚の共生は,ダイノフラゲラート (ゾオサンテラ) を含み,栄養素に制限されることがあります.
研究 の 目的:
- Montastraea cavernosaのオレンジ色赤色光源を特定するために.
- 珊瑚の光と栄養循環における共生サイアノバクテリアの役割を調査する.
主な方法:
- 珊瑚の光光譜分析.
- シンビオントを特定するために,サンゴの組織を顕微鏡で検査する.
- 窒素酵素酵素の活性を検出するための生化学分析.
主要な成果:
- オレンジ色の赤い光は,サンゴの宿主細胞内の単細胞サイアノバクテリアのフィコエリトリンから発生します.
- これらのシアノバクテリアは,ゾオキサンテラと共存しています.
- シアノバクテリアは窒素酵素を発現し,窒素の固定を示すことが判明しました.
結論:
- シンビオティックサイアノバクテリアは,Montastraea cavernosa.の光源である.
- これらのサイアノバクテリアによる窒素固定は,珊瑚-藻類共生にとって重要な窒素源を提供する可能性があります.
- この発見は,珊瑚の生態系におけるこれまで認識されていない栄養素経路を強調しています.
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