Methylocystis dominates methane oxidation in glacier foreland soil at elevated temperature

Author:

Zhu Xinshu12ORCID,Deng Yongcui34ORCID,Liu Yongqin15

Affiliation:

1. Center for the Pan-third Pole Environment, Lanzhou University , Lanzhou 730000 , China

2. College of Earth and Environmental Sciences, Lanzhou University , Lanzhou 730000 , China

3. School of Geography, Nanjing Normal University , Nanjing 210023 , China

4. Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application , Nanjing 210023 , China

5. State Key Laboratory of Tibetan Plateau Earth System, Resources and Environment (TPESRE), Institute of Tibetan Plateau Research, Chinese Academy of Sciences , Beijing 100101 , China

Abstract

Abstract Methane-oxidizing bacteria (methanotrophs) play an important role in mitigating methane emissions in various ecological environments, including cold regions. However, the response of methanotrophs in these cold environments to extreme temperatures above the in-situ temperature has not been thoroughly explored. Therefore, this study collected soil samples from Longxiazailongba (LXZ) and Qiangyong (QY) glacier forelands and incubated them with 13CH4 at 35°C under different soil water conditions. The active methanotroph populations were identified using DNA stable isotope probing (DNA-SIP) and high throughput sequencing techniques. The results showed that the methane oxidation potential in LXZ and QY glacier foreland soils was significantly enhanced at an unusually high temperature of 35°C during microcosm incubations, where abundant substrate (methane and oxygen) was provided. Moreover, the influence of soil water conditions on this potential was observed. Interestingly, Methylocystis, a type II and mesophilic methanotroph, was detected in the unincubated in-situ soil samples and became the active and dominant methanotroph in methane oxidation at 35°C. This suggests that Methylocystis can survive at low temperatures for a prolonged period and thrive under suitable growth conditions. Furthermore, the presence of mesophilic methanotrophs in cold habitats could have potential implications for reducing greenhouse gas emissions in warming glacial environments.

Funder

National Natural Science Foundation of China

Second Tibetan Plateau Scientific Expedition and Research

Publisher

Oxford University Press (OUP)

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