Abstract
The enzymatic hydrolysis of lignocellulosic polymers is generally considered the rate-limiting step to methane production in anaerobic digestion of lignocellulosic biomass. The present study aimed to investigate how the hydrolytic microbial communities of three different types of anaerobic digesters adapted to lignocellulose-rich wheat straw in continuous stirred tank reactors operated for 134 days. Cellulase and xylanase activities were monitored weekly using fluorescently-labeled model substrates and the enzymatic profiles were correlated with changes in microbial community compositions based on 16S rRNA gene amplicon sequencing to identify key species involved in lignocellulose degradation. The enzymatic activity profiles and microbial community changes revealed reactor-specific adaption of phylogenetically different hydrolytic communities. The enzymatic activities correlated significantly with changes in specific taxonomic groups, including representatives of Ruminiclostridium, Caldicoprobacter, Ruminofilibacter, Ruminococcaceae, Treponema, and Clostridia order MBA03, all of which have been linked to cellulolytic and xylanolytic activity in the literature. By identifying microorganisms with similar development as the cellulase and xylanase activities, the proposed correlation method constitutes a promising approach for deciphering essential cellulolytic and xylanolytic microbial groups for anaerobic digestion of lignocellulosic biomass.
Originalsprog | Engelsk |
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Artikelnummer | 645174 |
Tidsskrift | Frontiers in Microbiology |
Vol/bind | 12 |
Antal sider | 13 |
ISSN | 1664-302X |
DOI | |
Status | Udgivet - 25 maj 2021 |
Bibliografisk note
Funding Information:We acknowledge the reactor operators at the full-scale plants for providing the inocula and the requested information regarding reactor operation. Funding. This study was funded by the Innovation Fund Denmark Project ?NomiGas? (1377-00040A), ?Electrogas? (4106-00017B), and by Apple Inc. as part of the APPLAUSE bio-energy collaboration with Aarhus University. Work conducted in the JLN laboratory was supported by the Novo Nordisk Foundation (Grant no. NNF16OC0021818).
Funding Information:
This study was funded by the Innovation Fund Denmark Project “NomiGas” (1377-00040A), “Electrogas” (4106-00017B), and by Apple Inc. as part of the APPLAUSE bio-energy collaboration with Aarhus University. Work conducted in the JLN laboratory was supported by the Novo Nordisk Foundation (Grant no. NNF16OC0021818).
Publisher Copyright:
© Copyright © 2021 Jensen, de Jonge, Dolriis, Kragelund, Fischer, Eskesen, Noer, Møller, Ottosen, Nielsen and Kofoed.