Propagule limitation affects the response of soil methane oxidizer community to increased salinity

Fang, Jie; Adams, Jonathan M.; Deng, Yangfan; Zhu, Xinshu; Hernández, Marcela; Liu, Yongqin

doi:10.1016/j.geoderma.2022.116082

Cited by 2 publications

(1 citation statement)

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“…Methylomicrobium and other Type Ia salt-tolerant and halophilic methanotrophs play an active role in CH 4 cycling [ 19 , 30–32 ]. For example, Methylomicrobium became dominant with the increase in salinity, and the previously inhibited methanotrophy quickly recovered in Lake Qinghai sediment [ 33 ]. In this study, we found even though methanotrophs like Methylomicrobium exist widely and were actively oxidizing CH 4 in saline lakes, their relative abundance in bacteria was generally low (<0.1%).…”

Section: Discussionmentioning

confidence: 99%

Methylomonadaceae was the active and dominant methanotroph in Tibet lake sediments

Deng,

Liang,

Zhu

et al. 2024

ISME Communications

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Methane (CH4), an important greenhouse gas, significantly impacts the local and global climate. Our study focused on the composition and activity of methanotrophs residing in the lakes on the Tibetan Plateau, a hotspot for climate change research. Based on the field survey, the family Methylomonadaceae had a much higher relative abundance in freshwater lakes than in brackish and saline lakes, accounting for ~92% of total aerobic methanotrophs. Using the microcosm sediment incubation with 13CH4 followed by high throughput sequencing and metagenomic analysis, we further demonstrated that the family Methylomonadaceae was actively oxidizing CH4. Moreover, various methylotrophs, such as the genera Methylotenera and Methylophilus, were detected in the 13C-labeled DNAs, which suggested their participation in CH4-carbon sequential assimilation. The presence of CH4 metabolism, such as the tetrahydromethanopterin (H4MPT) and the ribulose monophosphate (RuMP) pathways, was identified in the metagenome-assembled genomes (MAGs) of the family Methylomonadaceae. Furthermore, they had the potential to adapt to oxygen-deficient conditions and utilize multiple electron acceptors, such as metal oxides (Fe3+), nitrate, and nitrite, for survival in the Tibet lakes. Our findings highlighted the predominance of Methylomonadaceae and the associated microbes as active CH4 consumers, potentially regulating the CH4 emissions in the Tibet freshwater lakes. These insights contributed to understanding the plateau carbon cycle and emphasized the significance of methanotrophs in mitigating climate change.

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Section: Discussionmentioning

confidence: 99%