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Differential engagement of fermentative taxa in gut contents of the earthworm Lumbricus terrestris

Title data

Meier, Anja ; Hunger, Sindy ; Drake, Harold L.:
Differential engagement of fermentative taxa in gut contents of the earthworm Lumbricus terrestris.
In: Applied and Environmental Microbiology. (2017) . - in press.
ISSN 1098-5336
DOI: https://doi.org/10.1128/AEM.01851-17

Abstract in another language

The earthworm gut is an anoxic, saccharide-rich microzone in aerated soils. The apparent degradation of diverse saccharides in the alimentary canal of the model earthworm Lumbricus terrestris is concomitant with the production of diverse organic acids, indicating that fermentation is an ongoing process in the earthworm gut. However, little is known about how different gut-associated saccharides are fermented. The hypothesis of this investigation was that different gut-associated saccharides differentially stimulate fermentative microorganisms in gut contents of L. terrestris. This hypothesis was addressed by (a) assessing the fermentation profiles of anoxic gut content microcosms that were supplemented with gut-associated saccharides and (b) the concomitant phylogenic analysis of 16S rRNA sequences. Galactose, glucose, maltose, mannose, arabinose, fucose, rhamnose, and xylose stimulated the production of fermentation products, including H2, CO2, acetate, lactate, propionate, formate, succinate, and ethanol. Fermentation profiles were dependent on the supplemental saccharide (e.g., glucose yielded large amounts of H2 and ethanol whereas fucose did not, and maltose yielded large amounts of lactate whereas mannose did not). Approximately 1,750,000 16S rRNA sequences were affiliated with 37 families, and phylogenic analyses indicated that a respective saccharide stimulated a subset of the diverse phylotypes. An Aeromonas-related phylotype displayed a high relative abundance in all treatments, whereas key Enterobacteriaceae-affiliated phylotypes were stimulated by some but not all saccharides. Collectively, these results reinforce the likelihood that (a) different saccharides stimulate different fermentations in gut contents of the earthworm, and (b) facultative aerobes related to Aeromonadaceae and Enterobacteriaceae can be important drivers of these fermentations.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: BAYCEER144224
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Biology > Chair Ecological Microbiology
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Biology > Chair Ecological Microbiology > Chair Ecological Microbiology - Univ.-Prof. Harold L. Drake, Ph.D.
Research Institutions
Research Institutions > Research Centres
Research Institutions > Research Centres > Bayreuth Center of Ecology and Environmental Research- BayCEER
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Biology
Result of work at the UBT: Yes
DDC Subjects: 500 Science
Date Deposited: 09 Jan 2018 13:20
Last Modified: 09 Jan 2018 13:20
URI: https://eref.uni-bayreuth.de/id/eprint/41229