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  Water-driven microbial nitrogen transformations in biological soil crusts causing atmospheric nitrous acid and nitric oxide emissions

Maier, S., Kratz, A. M., Weber, J., Prass, M., Liu, F., Clark, A. T., et al. (2021). Water-driven microbial nitrogen transformations in biological soil crusts causing atmospheric nitrous acid and nitric oxide emissions. The ISME Journal, 15. doi:10.1038/s41396-021-01127-1.

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 Creators:
Maier, S.1, Author              
Kratz, A. M.1, Author              
Weber, J.1, Author              
Prass, M., Author
Liu, F.1, Author              
Clark, A. T., Author
Abed, R. M. M., Author
Su, H., Author
Cheng, Y.1, Author              
Eickhorst, T., Author
Fiedler, S., Author
Pöschl, U.1, Author              
Weber, B., Author
Affiliations:
1Multiphase Chemistry, Max Planck Institute for Chemistry, Max Planck Society, ou_1826290              

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 Abstract: Biological soil crusts (biocrusts) release the reactive nitrogen gases (Nr) nitrous acid (HONO) and nitric oxide (NO) into the atmosphere, but the underlying microbial process controls have not yet been resolved. In this study, we analyzed the activity of microbial consortia relevant in Nr emissions during desiccation using transcriptome and proteome profiling and fluorescence in situ hybridization. We observed that < 30 min after wetting, genes encoding for all relevant nitrogen (N) cycling processes were expressed. The most abundant transcriptionally active N-transforming microorganisms in the investigated biocrusts were affiliated with Rhodobacteraceae, Enterobacteriaceae, and Pseudomonadaceae within the Alpha- and Gammaproteobacteria. Upon desiccation, the nitrite (NO2−) content of the biocrusts increased significantly, which was not the case when microbial activity was inhibited. Our results confirm that NO2− is the key precursor for biocrust emissions of HONO and NO. This NO2− accumulation likely involves two processes related to the transition from oxygen-limited to oxic conditions in the course of desiccation: (i) a differential regulation of the expression of denitrification genes; and (ii) a physiological response of ammonia-oxidizing organisms to changing oxygen conditions. Thus, our findings suggest that the activity of N-cycling microorganisms determines the process rates and overall quantity of Nr emissions.

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Language(s): eng - English
 Dates: 2021-11-11
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1038/s41396-021-01127-1
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Title: The ISME Journal
  Other : The ISME journal : multidisciplinary journal of microbial ecology
Source Genre: Journal
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Publ. Info: Basingstoke : Nature Publishing Group
Pages: 13 Volume / Issue: 15 Sequence Number: - Start / End Page: - Identifier: ISSN: 1751-7370
CoNE: https://pure.mpg.de/cone/journals/resource/1751-7370