Trench-Fiol, Stephanie and Fink, Patrick ORCID: 0000-0002-5927-8977 (2020). Metatranscriptomics From a Small Aquatic System: Microeukaryotic Community Functions Through the Diurnal Cycle. Front. Microbiol., 11. LAUSANNE: FRONTIERS MEDIA SA. ISSN 1664-302X

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Abstract

Light is an important factor for the growth of planktonic organisms, and many of them depend on the diurnal light/dark cycle to regulate key metabolic processes. So far, most of the diel responses were only studied in single species or marine and large lake communities. Yet, we lack information on whether these processes are regulated similarly in small aquatic systems such as ponds. Here, we investigated the activity of a microeukaryotic community from a temperate, small freshwater pond in response to the diurnal cycle. For this, we took samples at midday and night during the Central European summer. We extracted pigments and RNA from samples and the sequencing of eukaryotic transcripts allowed us to obtain day and night metatranscriptomes. Differentially expressed transcripts primarily corresponded to photosynthesis-related and translational processes, and were found to be upregulated at midday with high light conditions compared to darkness. Unique gene ontology classes were found at each respective condition. During the day, ontology classes including photoreception for photosynthesis, defense, and stress mechanisms dominated, while motility, ribosomal assembly and other large, energy-consuming processes were restricted to the night. Euglenophyta and Chlorophyta dominated the active phototrophic community, as shown by the pigment composition analysis. Regarding the gene expression patterns, we could confirm that the pond community appears to follow similar diurnal dynamics as those described for larger aquatic ecosystems. Overall, combining pigment analyses, metatranscriptomics, and data on physicochemical factors yielded considerably more insight into the metabolic processes performed by the microeukaryotic community of a small freshwater ecosystem.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Trench-Fiol, StephanieUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Fink, PatrickUNSPECIFIEDorcid.org/0000-0002-5927-8977UNSPECIFIED
URN: urn:nbn:de:hbz:38-332917
DOI: 10.3389/fmicb.2020.01006
Journal or Publication Title: Front. Microbiol.
Volume: 11
Date: 2020
Publisher: FRONTIERS MEDIA SA
Place of Publication: LAUSANNE
ISSN: 1664-302X
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
DISSOLVED ORGANIC-MATTER; PHYTOPLANKTON; LIGHT; RESPONSES; PHOSPHORUS; NUTRIENTS; NITROGEN; PROGRAM; RHYTHMS; LAKESMultiple languages
MicrobiologyMultiple languages
URI: http://kups.ub.uni-koeln.de/id/eprint/33291

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