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Adverse Effect of the Methanotroph sp. M6 on the Non-Methylotroph sp. NM2. | LitMetric

Adverse Effect of the Methanotroph sp. M6 on the Non-Methylotroph sp. NM2.

J Microbiol Biotechnol

Department of Microbiology, Pusan National University, Pusan 46241, Republic of Korea.

Published: October 2018

AI Article Synopsis

  • Certain non-methylotrophic bacteria can boost the growth and methane removal activity of methanotrophs, but their interactions aren't fully understood.
  • In an experiment, NM2 significantly increased the biomass and methane removal of M6, showing that NM2 enhances M6's growth and methane-monooxygenase gene expression.
  • The results suggest that M6 benefits from its relationship with NM2 while NM2 suffers when separated, highlighting the importance of close physical proximity in their interaction for enhanced methane removal.

Article Abstract

Several non-methylotrophic bacteria have been reported to improve the growth and activity of methanotrophs; however, their interactions remain to be elucidated. We investigated the interaction between sp. M6 and sp. NM2. A batch co-culture experiment showed that NM2 markedly increased the biomass and methane removal of M6. qPCR analysis revealed that NM2 enhanced both the growth and methane-monooxygenase gene expression of M6. A fed-batch experiment showed that co-culture was more efficient in removing methane than M6 alone (28.4 18.8 μmol·l·d), although the biomass levels were similar. A starvation experiment for 21 days showed that M6 population remained stable while NM2 population decreased by 66% in co-culture, but the results were opposite in pure cultures, indicating that M6 may cross-feed growth substrates from NM2. These results indicate that M6 apparently had no negative effect on NM2 when M6 actively proliferated with methane. Interestingly, a batch experiment involving a dialysis membrane indicates that physical proximity between NM2 and M6 is required for such biomass and methane removal enhancement. Collectively, the observed interaction is beneficial to the methanotroph but adversely affects the non-methylotroph; moreover, it requires physical proximity, suggesting a tight association between methanotrophs and non-methylotrophs in natural environments.

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Source
http://dx.doi.org/10.4014/jmb.1804.04015DOI Listing

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