体与二体的共生可以弥补海洋中缺少的
Bernhard Tschitschko1,2, Mertcan Esti1, Miriam Philippi1,3
1Max Planck Institute for Marine Microbiology, Bremen, Germany.
Nature
|May 9, 2024
概括
海洋微生物
科学领域:
- 海洋微生物学
- 生物地质化学
- 共生关系
背景情况:
- 海洋 (N2) 固定对于海洋生产力和生物碳至关重要.
- 固主要归因于菌,但酶基因在其他海洋微生物中普遍存在.
- 海洋中非菌固剂的作用在很大程度上是未知的.
研究的目的:
- 在海洋中识别和描述非菌固生物.
- 研究一种新的固共生体与海洋藻之间的共生关系.
- 评估这些共生对海洋循环的贡献.
主要方法:
- 基因组分析以识别海洋微生物中的酶基因.
- 发现并分离了一种新的N2固定共生体"Candidatus Tectiglobus diatomicola".
- 研究共生生物及其藻宿主之间的固定和碳交换.
主要成果:
- 发现了"Candidatus Tectiglobus diatomicola",一种非蓝色细菌的N2固定共生物.
- 这种共生生物与单细胞藻形成了固定协会,扩大了已知Rhizobiales的共生.
- 在热带北大西洋中,树生物与二体的共生对固定有显著的贡献,与菌相似.
结论:
- 像"Candidatus Tectiglobus diatomicola"这样的非蓝藻共生体是海洋固的重要贡献者.
- 体与二体的共生是海洋生态系统中以前被低估的新源.
- 这些共生可以解释固率在广的海洋地区,那里的蓝藻细菌稀缺.
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