併存するプロクロロコックスの生態型の生理学と分子系統学
L R Moore1, G Rocap, S W Chisholm
1Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, Cambridge 02139, USA.
Nature
|June 12, 1998
まとめ
異なるプロクロロコックスの集団が海で共存し,それぞれが異なる光のレベルに適応しています. このエコタイプの差異化により,様々な深度で生き残ることができ,環境のグラデーションに微生物の適応を示しています.
科学分野:
- マリン・マイクロバイオロジー
- 海洋学 海洋学 海洋学
- 光合成の研究研究である.
背景:
- プロクロロコッカスは,海洋における重要な酸素性フォトトロフです.
- 広い深さの範囲で繁栄し,大きな光の変動があります.
- 以前の仮説では,光のグラデーションに適応した遺伝的に異なった集団が示唆されていた.
研究 の 目的:
- 共存する,生理学的に異なるプロクロロコッカス集団の直接的な証拠を提供するために.
- 光の強度への適応における生態型差異の役割を調査する.
- 人口生存に対する微生物多様性の貢献を理解する.
主な方法:
- 北大西洋の同時発生のプロクロロコッカス菌群の分離と分析.
- 孤立した株における光依存生理学的特徴.
- 遺伝的関連性を評価するための16SリボソームRNA遺伝子配列決定.
主要な成果:
- 異なる共同分離体は,光に依存した成長反応が有意に異なっていた.
- ある集団は高照度で繁栄し,もう一つは光阻害でした.
- 同隔離物は高い遺伝的類似性を示した (16S rRNAの97%),これは進化の密接な関係を示している.
- エコタイプの差異化は,同時に発生する集団で確認されました.
結論:
- この研究は,異なる光の強さに適応した共存するプロクロロコッカスの生態型に対する直接的な証拠を提供します.
- 分子微生物多様性は,生理学的に異なる,密接に関連した集団から生じる可能性があります.
- 複数のエコタイプの共存は,多様な環境条件において,全体的な人口生存率を高めます.
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