亚北极土壤中的微生物在短期,中长期和长期变暖下被剥夺了核糖体
Andrea Söllinger1, Laureen S Ahlers1, Mathilde Borg Dahl2
1Department of Arctic and Marine Biology, UiT The Arctic University of Norway, Framstredet 39, 9019 Tromsø, Norway.
The ISME journal
|May 9, 2024
概括
土壤变暖会减少微生物核糖体,这些核糖体对于蛋白质合成至关重要. 这种对气温上升的反应影响了土壤生态系统功能和全球碳循环.
科学领域:
- 微生物学 微生物学
- 土壤科学 土壤科学
- 全球变化生物学
背景情况:
- 土壤微生物对生态系统功能和碳循环至关重要.
- 全球变暖影响微生物生理学,对土壤健康有影响.
- 微生物蛋白质生物合成机制 (核糖体) 是细胞活动的关键指标.
研究的目的:
- 为了研究长期土壤变暖对微生物核糖体的影响.
- 评估亚北极土壤中温度和核糖体含量之间的关系.
- 了解核糖体减少如何影响土壤碳动力学.
主要方法:
- 使用的RNA:DNA和RNA:微生物生物质碳 (MBC) 比率作为核糖体含量的代理.
- 在自然地热温度梯度中比较了温暖和未温暖的土壤.
- 进行了化实验,以测量二氧化碳排放率.
主要成果:
- 在温暖的土壤中,RNA:DNA比率在各个季节均始终较低,不管变暖的持续时间或强度如何.
- 随着温度的增加,RNA:MBC比率下降.
- 温暖的土壤表现出每单位RNA的二氧化碳排放率明显更高.
结论:
- 在变暖的条件下,土壤微生物减少了核糖体含量,这表明了生理适应.
- 温度被确定为这种核糖体枯竭的主要驱动因素.
- 核糖体减少可以通过重新分配资源从合成到代谢来改变土壤碳动态.
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