通过细胞内和细胞外机制实现土壤中微生物磷的循环利用

IF 5.1 Q1 ECOLOGY ISME communications Pub Date : 2024-01-24 DOI:10.1038/s43705-023-00340-7
Jie Chen, Han Xu, Jasmin Seven, Thomas Zilla, Michaela A. Dippold, Yakov Kuzyakov
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摘要

全球氮(N)供应量不断增加,而磷(P)资源却日益枯竭,这两者之间日益加剧的化学计量失衡增加了土壤微生物P循环的重要性。目前还不清楚生态系统养分状况对细胞外和胞内磷(再)循环的贡献,这使土壤微生物成为我们了解生态系统对日益严重的磷缺乏反应的一个盲点。通过 33P 和 14C 标记与微生物群落生物标志物和功能基因追踪相结合,我们揭示了 DNA 和磷脂在土壤磷循环中的作用。低磷土壤中的微生物优先将磷分配给磷脂,在C添加的驱动下加速磷脂代谢,这与磷脂周转快的高丰度微生物群落成员(如一些G-)密切相关。然而,在高磷土壤中,更多的磷被分配到 DNA 上,当提供充足的 C 时,微生物功能转向 DNA 合成,以支持复制生长,这与真菌共生菌和编码 DNA 引物酶的微生物基因的大量富集密切相关。因此,通过重新利用磷脂中储存的磷,对低磷供应的适应加速了微生物细胞内磷的循环。然而,在高P可用性条件下,微生物通常通过释放和再利用DNA P 通过微生物死亡-生长动力学来实现胞外P循环。这些结果加深了我们对微生物通过调节特定成分的钾途径来适应土壤钾缺乏的理解,并反映了磷脂和DNA在钾循环中的特定功能。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

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Microbial phosphorus recycling in soil by intra- and extracellular mechanisms
Rising global stoichiometric imbalance between increasing nitrogen (N) availability and depleting phosphorus (P) resources increases the importance of soil microbial P recycling. The contribution of extra- versus intracellular P (re-)cycling depending on ecosystem nutrient status is vastly unclear, making soil microorganisms a blind spot in our understanding of ecosystem responses to increasing P deficiency. We quantified P incorporation into microbial DNA and phospholipids by 33P labeling under contrasting conditions: low/high P soil × low/high carbon (C)NP application. By combining 33P and 14C labeling with tracing of microbial community biomarkers and functional genes, we disengaged the role of DNA and phospholipids in soil P cycling. Microorganisms in low P soil preferentially allocated P to phospholipids with an acceleration of phospholipids metabolism driven by C addition, which was strongly related to high abundances of microbial community members (e.g. some G-) with a fast phospholipids turnover. In high P soil, however, more P was allocated to DNA with a microbial functional shift towards DNA synthesis to support a replicative growth when sufficient C was supplied, which was coupled with a strong enrichment of fungal copiotrophs and microbial genes coding DNA primase. Consequently, adaptation to low P availability accelerated microbial intracellular P recycling through reutilization of the P stored in phospholipids. However, microorganisms under high P availability commonly adopted extracellular P recycling with release and reuse of DNA P by microbial death-growth dynamics. These results advance our understanding on microbial adaptation to P deficiency in soil by regulating component-specific P pathways and reflect the specific functions of phospholipids and DNA for P recycling.
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