春季藻开花期间的海洋颗粒微生物组含有活性硫酸盐减少细菌
Robin Siebers1, Doreen Schultz1, Mohamed S Farza1
1Institute of Microbiology, University of Greifswald, Greifswald, Germany.
FEMS microbiology ecology
|March 15, 2024
概括
海洋浮游植物的繁荣在粒子中创造了无氧,支持减少硫酸盐的细菌. 这项研究揭示了北海浅水中的关键藻类-细菌相互作用和碳循环.
科学领域:
- 海洋微生物生态学
- 生物地质化学循环过程
- 植物浮游生物繁荣的动力学
背景情况:
- 植物浮游生物的繁荣对海洋食物网至关重要,它们提供碳并形成有机颗粒物.
- 这些粒子支持微生物群落,并影响碳捕集.
- 了解海藻与细菌之间的相互作用是海洋生态系统功能的关键.
研究的目的:
- 在春季植物浮游植物开花期间,研究微生物群落及其在有机颗粒物中的功能.
- 识别与不同植物浮游生物类型 (藻和恐龙鞭状体) 相关的特定细菌群.
- 评估在浅水中的花颗粒中生物地质化学过程的潜力,例如硫酸盐的减少.
主要方法:
- 从颗粒物分数 (>10微米) 中分析了16S和18S核糖体RNA基因扩增序列.
- 超蛋白质组分析以确定微生物的功能.
- 在北海春季开花期间 (2018年) 采样超过51个时间点.
- 网络分析以确定细菌和植物浮游生物之间的共发生模式.
主要成果:
- 确定了两种不同的细菌网络模块,与藻和恐龙鞭状动物有关.
- 原子相关细菌包括硫酸盐降解的Desulfobacterota和硫氧化的Ectothiorhodospiraceae.
- 甲型蛋白质组学证实了在花颗粒中存在用于仿真硫酸降解酶的存在.
- 在粒子分数内发现了能够支持硫酸盐减少的无氧.
结论:
- 浅浅的植物浮游生物的开花提供无氧微环境,支持硫酸盐的减少.
- 岩-海藻合在塑造浅海环境中的微生物群中发挥着重要作用.
- 这些发现有助于更好地理解沿海繁殖系统中藻类与细菌的相互作用和碳出口.
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