对Alteromonas macleodii的自下而上和自上而下控制导致不同的溶解有机物组成
Qi Chen1,2, Christian Lønborg3, Feng Chen4
1State Key Laboratory for Marine Environmental Science, Institute of Marine Microbes and Ecospheres, College of Ocean and Earth Sciences, Xiamen University, Xiamen, 361102, China.
ISME communications
|March 12, 2024
概括
这项研究调查了Alteromonas macleodii的溶解有机物 (DOM) 生产,该研究揭示了基质可用性 (自下而上) 与病毒溶解 (自上而下) 控制的独特分子特征. 这些发现强调了不同的环境因素如何塑造微生物DOM组成.
科学领域:
- 微生物生态学 微生物生态学
- 生物地质化学生物地质化学
- 有机地化学 有机地化学
背景情况:
- 溶解有机物 (DOM) 在水生生态系统中至关重要,影响营养循环和碳捕获.
- DOM的分子组成是由微生物活动所塑造的,但资源可用性 (自下而上) 和病毒掠食 (自上而下) 的独特作用仍未得到充分研究.
- 了解这些控制是预测DOM在各种环境中的命运和功能的关键.
研究的目的:
- 研究自下而上 (基质类型) 和自上而下 (病毒溶解) 控制对海洋细菌Alteromonas macleodii产生的DOM分子组成的影响.
- 为了区分由基质驱动的生长所留下的分子指纹与细菌DOM上的病毒感染.
主要方法:
- 在各种基质 (葡萄糖,拉米纳林,藻类提取物,海水) 上培养Alteromonas macleodii.
- 用性菌体感染细菌培养以模拟病毒溶解.
- 超高分辨率质谱法 (FT-ICR MS) 用于分析释放的DOM的分子组成.
主要成果:
- 不同基质上的细菌生长导致氧化,不和含硫分子 (O7配方物种) 的优先释放或保存.
- 病毒溶解诱导了具有更高飽和度的DOM的产生,并增加了含或硫的分子.
- 根据自下而上或自上而下的因素控制了细菌活动,观察到不同的分子特征.
结论:
- 基质的可用性和病毒溶解都显著改变了细菌DOM的分子组成.
- 自下而上的和自上而下的控制对DOM传递独特的分子指纹,影响其反应性和生态作用.
- 这项研究为海洋环境中DOM分子多样性的驱动因素提供了关键的见解.
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