Effect of earthworm feeding guilds on ingested dissimilatory nitrate reducers and denitrifiers in the alimentary canal of the earthworm.

Applied and Environmental Microbiology
Peter S Depkat-JakobHarold L Drake

Abstract

The earthworm gut is an anoxic nitrous oxide (N(2)O)-emitting microzone in aerated soils. In situ conditions of the gut might stimulate ingested nitrate-reducing soil bacteria linked to this emission. The objective of this study was to determine if dissimilatory nitrate reducers and denitrifiers in the alimentary canal were affected by feeding guilds (epigeic [Lumbricus rubellus], anecic [Lumbricus terrestris], and endogeic [Aporrectodea caliginosa]). Genes and gene transcripts of narG (encodes a subunit of nitrate reductase and targets both dissimilatory nitrate reducers and denitrifiers) and nosZ (encodes a subunit of N(2)O reductase and targets denitrifiers) were detected in guts and soils. Gut-derived sequences were similar to those of cultured and uncultured soil bacteria and to soil-derived sequences obtained in this study. Gut-derived narG sequences and narG terminal restriction fragments (TRFs) were affiliated mainly with Gram-positive organisms (Actinobacteria). The majority of gut- and uppermost-soil-derived narG transcripts were affiliated with Mycobacterium (Actinobacteria). In contrast, narG sequences indicative of Gram-negative organisms (Proteobacteria) were dominant in mineral soil. Most nosZ sequences and nosZ ...Continue Reading

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Citations

Apr 26, 2011·Applied and Environmental Microbiology·Lucas D NebertJan Willem van Groenigen
Feb 22, 2012·Applied and Environmental Microbiology·Peter S Depkat-JakobHarold L Drake
Nov 18, 2018·FEMS Microbiology Ecology·Lydia ZeibichHarold L Drake
Feb 7, 2019·Environmental Microbiology·Lydia ZeibichHarold L Drake
Jul 9, 2017·Applied Microbiology and Biotechnology·Tomoko YasudaKazuyoshi Suzuki
Dec 17, 2017·Applied and Environmental Microbiology·Anja B MeierHarold L Drake

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