Low yield and abiotic origin of N2O formed by the complete nitrifier Nitrospira inopinata
Low yield and abiotic origin of N2O formed by the complete nitrifier Nitrospira inopinata
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DOI：
10.1038/s41467-019-09790-x
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发表时间：
2019-04-23
影响因子：
16.6
通讯作者：
Daims, Holger
中科院分区：
文献类型：
--
作者：
Kits, K. Dimitri;Jung, Man-Young;Daims, Holger
一氧化二氮（N2O）和一氧化氮（NO）是大气中的痕量气体，它们会导致气候变化并影响平流层和地面臭氧浓度。氨氧化细菌（AOB）和古细菌（AOA）是氮循环中的关键参与者，也是全球N2O和NO的主要生产者。然而，对最近发现的和广泛分布的完全氨氧化剂（comammox）的N2O和NO生产一无所知。在这里，我们表明，comammox细菌Nitrospira inopinata是敏感的NO清除剂的抑制，不能分解为N2O，并发出N2O的水平，相当于AOA，但远低于AOB。此外，我们还证明了N.在不同的氧状态下形成的inopinata来源于羟胺的非生物转化。我们的研究结果表明，comammox微生物可能会产生较少的N2O硝化过程中比AOB。
Nitrous oxide (N2O) and nitric oxide (NO) are atmospheric trace gases that contribute to climate change and affect stratospheric and ground-level ozone concentrations. Ammonia oxidizing bacteria (AOB) and archaea (AOA) are key players in the nitrogen cycle and major producers of N2O and NO globally. However, nothing is known about N2O and NO production by the recently discovered and widely distributed complete ammonia oxidizers (comammox). Here, we show that the comammox bacterium Nitrospira inopinata is sensitive to inhibition by an NO scavenger, cannot denitrify to N2O, and emits N2O at levels that are comparable to AOA but much lower than AOB. Furthermore, we demonstrate that N2O formed by N. inopinata formed under varying oxygen regimes originates from abiotic conversion of hydroxylamine. Our findings indicate that comammox microbes may produce less N2O during nitrification than AOB.