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The mineralosphere—interactive zone of microbial colonization and carbon use in grassland soils

Boeddinghaus, Runa S. ; Marhan, Sven ; Gebala, Aurelia ; Haslwimmer, Heike ; Vieira, Selma ; Sikorski, Johannes ; Overmann, Jörg ; Soares, Margarida LU ; Rousk, Johannes LU and Rennert, Thilo , et al. (2021) In Biology and Fertility of Soils 57(5). p.587-601
Abstract

To improve our understanding of early microbial colonization of pristine minerals and their group-specific C utilization, we exposed minerals (illite/goethite/quartz) amended with artificial root exudates (ARE, glucose, and citric acid) in grassland soils for a period of 24 weeks. FTIR spectra indicated that mineral-associated ARE were used within the first 2 weeks of exposure and were replaced by other carbohydrates derived from living or dead cells as well as soil-borne C sources transported into the mineralosphere after heavy rain events. Fungi and Gram-positive bacteria incorporated ARE-derived C more rapidly than Gram-negative bacteria. Gram-negative bacteria presumably profited indirectly from the ARE by cross-feeding on... (More)

To improve our understanding of early microbial colonization of pristine minerals and their group-specific C utilization, we exposed minerals (illite/goethite/quartz) amended with artificial root exudates (ARE, glucose, and citric acid) in grassland soils for a period of 24 weeks. FTIR spectra indicated that mineral-associated ARE were used within the first 2 weeks of exposure and were replaced by other carbohydrates derived from living or dead cells as well as soil-borne C sources transported into the mineralosphere after heavy rain events. Fungi and Gram-positive bacteria incorporated ARE-derived C more rapidly than Gram-negative bacteria. Gram-negative bacteria presumably profited indirectly from the ARE by cross-feeding on mineral-associated necromass of fungi and Gram-positive bacteria. The Gram-negative bacterial phyla Verrucomicrobia, Planctomycetes, Gemmatimonadetes, Armatimonadetes, and Chloroflexi showed a positive correlation with Gram-negative PLFA abundances. After 24 weeks of exposure in the grassland soils, abundances of soil microorganisms in the mineralosphere reached only 3.1% of the population density in soil. In conclusion, both bacteria and fungi slowly colonize new surfaces such as pristine minerals, but quickly assimilate artificial root exudates, creating an active microbial community in the mineralosphere.

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organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Carbon turnover, Exudates, Meadow, Minerals, Pasture, Soil microorganisms
in
Biology and Fertility of Soils
volume
57
issue
5
pages
15 pages
publisher
Springer
external identifiers
  • scopus:85102561347
ISSN
0178-2762
DOI
10.1007/s00374-021-01551-7
language
English
LU publication?
yes
id
462f3ab2-a8b8-4935-9cef-d8703d4af1cf
date added to LUP
2021-03-29 10:42:12
date last changed
2024-05-04 04:40:57
@article{462f3ab2-a8b8-4935-9cef-d8703d4af1cf,
  abstract     = {{<p>To improve our understanding of early microbial colonization of pristine minerals and their group-specific C utilization, we exposed minerals (illite/goethite/quartz) amended with artificial root exudates (ARE, glucose, and citric acid) in grassland soils for a period of 24 weeks. FTIR spectra indicated that mineral-associated ARE were used within the first 2 weeks of exposure and were replaced by other carbohydrates derived from living or dead cells as well as soil-borne C sources transported into the mineralosphere after heavy rain events. Fungi and Gram-positive bacteria incorporated ARE-derived C more rapidly than Gram-negative bacteria. Gram-negative bacteria presumably profited indirectly from the ARE by cross-feeding on mineral-associated necromass of fungi and Gram-positive bacteria. The Gram-negative bacterial phyla Verrucomicrobia, Planctomycetes, Gemmatimonadetes, Armatimonadetes, and Chloroflexi showed a positive correlation with Gram-negative PLFA abundances. After 24 weeks of exposure in the grassland soils, abundances of soil microorganisms in the mineralosphere reached only 3.1% of the population density in soil. In conclusion, both bacteria and fungi slowly colonize new surfaces such as pristine minerals, but quickly assimilate artificial root exudates, creating an active microbial community in the mineralosphere.</p>}},
  author       = {{Boeddinghaus, Runa S. and Marhan, Sven and Gebala, Aurelia and Haslwimmer, Heike and Vieira, Selma and Sikorski, Johannes and Overmann, Jörg and Soares, Margarida and Rousk, Johannes and Rennert, Thilo and Kandeler, Ellen}},
  issn         = {{0178-2762}},
  keywords     = {{Carbon turnover; Exudates; Meadow; Minerals; Pasture; Soil microorganisms}},
  language     = {{eng}},
  month        = {{07}},
  number       = {{5}},
  pages        = {{587--601}},
  publisher    = {{Springer}},
  series       = {{Biology and Fertility of Soils}},
  title        = {{The mineralosphere—interactive zone of microbial colonization and carbon use in grassland soils}},
  url          = {{http://dx.doi.org/10.1007/s00374-021-01551-7}},
  doi          = {{10.1007/s00374-021-01551-7}},
  volume       = {{57}},
  year         = {{2021}},
}